i combustion characteristics of ammonium...
TRANSCRIPT
i
COMBUSTION CHARACTERISTICS OF AMMONIUM PERCHLORATE
BASED SOLID ROCKET PROPELLANT
AMIR BIN AZIZ
A thesis submitted in fulfillment of the
requirement for the award of the degree of
Master of Mechanical Engineering
Faculty of Mechanical Engineering
Universiti Teknologi Malaysia
April 2011
iii
DEDICATION
Dengan nama Allah yang Maha Pengasih lagi Maha Penyayang..
Teristimewa buat ibu dan ayah yang tersayang, Ramlah Binti Jusoh dan Aziz Bin
Othman. Begitu juga kepada Rokiah, Zaiton, Zainun, Razali, Razman, Zawiah, Abdul
Razak serta Nur Zulika ...
Terima kasih atas sokongan dan berkat doa kalian sehingga aku mampu mencapai
hingga ke tahap ini. Pengorbanan kalian semua tidak akan aku sia-siakan...
Amin..
Motivator terbaik adalah diri sendiri…
iv
ACKNOWLEDGEMENT
All praises to Allah S.W.T, the Almighty God and the Lord of the Universe,
the Merciful and Gracious. Salam to our beloved prophet, Nabi Muhammad s.a.w for
His mercy has given me the strength, blessing and time to complete this project.
Words cannot express my thankfulness to my supervisor Prof. Ir. Dr. Wan
Khairuddin Wan Ali who relentlessly providing me guidance throughout the study
with his knowledge and great patience. Both his dedications and passions toward
science have inspired me a lot. His encouragement is always with me all through my
study years. Without his endless support and guidance, I certainly will not be able to
accomplish this thesis and presented.
Thank you to Malaysia Space Agency (ANGKASA) and Ministry of Science,
Technology and Innovation (MOSTI) for funding my research and scholarship. I
extend my gratitude to Prof. Dr. Subramaniam Krishnan, Mr. Yaheyia Aldreany and
Mr. Wan Zaidi, who wealthily shared their experience and knowledge on the rocket
propellant and combustion analysis. I express my deep sense of gratitude and
indebtedness to our research officers and team members, Miss Zuriana, Mrs. Intan,
Mr. Rozi, Mrs. Norazila and all staffs of Aeronautic laboratory for their guidance,
advices and motivation while completing this project.
Last but not least, the biggest appreciation to my parent and family and also to
everyone for their precious contribution and a warm thank for all the support given.
Thank you…
v
ABSTRACT
There were many studies on ammonium perchlorate (AP) based solid rocket
propellant (SRP) and some data already exist. However, there is no complete data
available in Malaysia especially the information on the combustion characteristics of
baseline data of AP based SRP. This thesis discusses on the combustion
characteristics of AP based SRP including the methods of the propellant selection and
fabrication, burning rate test and static thrust test. Together with literature study and
theoretical performance, thirteen sets of different propellant mixture were finalized
with consideration of the mechanical and processability factors. The propellant was a
mixture of AP as an oxidizer, Aluminum (Al) as fuel and Hydroxy-Terminated
Polybutadiene (HTPB) as binder/fuel. For each mixture, HTPB binder was fixed at
15% and cured with Isophorone isocyanate (IPDI) (9.33% per mass of HTPB). The
percentage of the solid materials was set at a constant value of 85%. By varying the
AP and Al, the effect of oxidizer-fuel (O/F) ratio on the whole propellant can be
determined. The propellant strands were manufactured using press-molding method
and burnt in the strand burner at ambient pressure to obtain the initial burning
characteristics. Then four propellant compositions were selected, namely p60, p66,
p74 and p80 for further evaluation over a range of pressure from 6 atm to 31 atm .
The results show that the increasing of O/F ratio and combustion pressure lead to the
increase in burning rate. The fastest burning rate achieved was 12 -1mmsec at
combustion pressure of 31 atm for propellant p80 which has O/F ratio of 4.0. It was
found that, the formulated propellant in this study have the normal burning
characteristics with pressure exponent lies within the range of 0.501 to 0.561. Based
on theoretical evaluation, formulation for p66 gives highest specific impulse, spI .
Thus, p66 has been selected to be evaluated in static thrust testing to obtain its
performance characteristics. The results showed that the maximum thrust obtained is
162 N with generating spI of 143.92 sec.
vi
ABSTRAK
Kajian mengenai bahan dorong yang berasaskan ammonium perchlorate (AP) telah
banyak dijalankan dan sebahagian data telah diperoleh. Walaubagaimanapun, tiada
maklumat lengkap mengenai data-data asas bagi cirian pembakaran bahan dorong
yang berasaskan AP di Malaysia. Tesis ini merupakan kajian mengenai cirian
pembakaran bahan dorong berasaskan AP yang meliputi kaedah pemilihan dan
penyediaan bahan dorong, ujian kadar pembakaran dan ujian daya tujah statik.
Berdasarkan kajian literatur dan prestasi andaian ini, tigabelas set campuran bahan
dorong telah dipilih selepas mengambil kira faktor mekanikal dan kebolehsediaan.
Bahan dorong ini mengandungi AP yang bertindak sebagai bahan pengoksida,
aluminum (Al) sebagai bahan bakar dan hydroxy-terminated polybutadiene (HTPB)
sebagai bahan pengikat/bahan bakar. Bagi setiap campuran, HTPB telah ditetapkan
sebanyak 15%. Manakala bahan silangrantainya adalah isophorone diisocyanate
(IPDI) (9.33% daripada berat HTPB). Peratusan bahan pepejal pula telah dimalarkan
pada nilai 85%. Kesan nisbah bahan pengoksida-bahan bakar, O/F untuk keseluruhan
bahan dorong boleh diperoleh dengan mengubah kandungan AP dan Al. Jalur bahan
dorong disediakan dengan menggunakan kaedah acuan mampat dan dibakar di dalam
pembakar jalur pada tekanan atmosfera bagi memperoleh cirian pembakaran awal.
Kemudian, empat komposisi bahan dorong iaitu p60, p66, p74 dan p80 telah dipilih
bagi kajian lanjutan di bawah tekanan antara 6 atm hingga 31 atm . Keputusan ujikaji
menunjukkan bahawa peningkatan nisbah O/F dan tekanan kebuk merupakan faktor
kepada peningkatan kadar pembakaran. Kadar pembakaran terpantas yang diperoleh
adalah 12 -1mmsec pada tekanan kebuk 31atm untuk bahan dorong p80 yang
mempunyai nisbah O/F 4.0. Kajian mendapati keempat-empat formulasi bahan
dorong dalam kajian ini mempunyai cirian pembakaran normal dengan nilai pekali
tekanan, n antara 0.501 hingga 0.561. Berdasarkan kepada prestasi andaian, formulasi
p66 menunjukkan nilai denyut tentu, spI
yang tertinggi. Dengan itu, p66 telah dipilih
untuk diuji dalam ujian daya tujah statik bagi memperoleh cirian prestasi. Nilai daya
tujah tertinggi yang diperoleh adalah 162 N dengan nilai denyut tentu 143.92 saat.
vii
TABLE OF CONTENT
CHAPTER TITLE PAGE
DECLARATION ii
DEDICATION iii
ACKNOWLEDGEMENT iv
ABSTRACT v
ABSTRAK vi
TABLE OF CONTENT vii
LIST OF TABLES x
LIST OF FIGURES xii
LIST OF SYMBOLS xiv
1 INTRODUCTION 1
1.1 Objective of the Study 2
1.2 Scope of Study 2
1.3 Research Methodology 2
1.4 Outline of Report 3
1.5 Limitation of study 5
2 LITERATURE REVIEW 6
2.1 Overview 6
2.2 History of solid propellant rocket 6
2.3 Solid Rocket Propellant 8
2.4 Propellant Ingredients and Properties 9
2.4.1 Binder 12
2.4.2 Metal Fuel 14
2.4.3 Oxidizer 18
2.4.4 Additives 21
viii
2.5 Solid Propellant Burning Rate Measurement 22
2.5.1 Strand burner (Crawford Bomb) 22
2.5.2 Small ballistic evaluation motors (BEM) 23
2.5.3 Full-scale Motors 29
2.6 Burning Rate Equation 29
2.7 Summary 32
3 CHEMICAL ROCKET PROPELLANT
PERFORMANCE ANALYSIS 39
3.1 Overview 39
3.2 Assumptions for ideal rocket motor 39
3.3 Chemical Analysis of Propellant Combustion 40
3.3.1 Adiabatic Flame Temperature 40
3.3.2 Analysis of Thermochemical Properties 45
3.4 Analysis of performance parameter 50
4 SOLID PROPELLANT SELECTION AND
FABRICATION 52
4.1 Overview 52
4.2 Propellant Formulation Selection 52
4.3 Fabrication of the Propellant Strand 55
4.3.1 Preparation of Ammonium Perchlorate 56
4.3.2 Mixing procedure 59
4.3.3 Compression and cured 60
5 BURNING RATE CHARACTERISTICS 65
5.1 Overview 65
5.2 Combustion of AP Based Solid Propellant 65
5.3 Strand Burner Design 70
5.4 Burning Rate Test 73
5.5 Preliminary testing 89
5.6 Results and discussion 80
5.6.1 Effect of O/F and Combustion Pressure on the
Burning Rate 81
ix
5.6.2 Effect of O/F on the Pressure Exponent 85
5.6.3 Uncertainty Analysis for Burning Rate Test 93
6 STATIC THRUST TESTING 94
6.1 Overview 94
6.2 Static thrust facilities 94
6.3 Rocket motor 96
6.4 Testing procedure 100
6.5 Results and discussion 103
6.5.1 Nozzle with throat diameter 25 mm 103
6.5.2 Nozzle with diameter throat 30mm 106
6.5.3 Uncertainty Analysis for Static Thrust Testing 109
7 CONCLUSION AND RECOMENDATIONS 111
7.1 Conclusion 111
7.2 Recommendation 112
REFERENCES 113
APPENDICES A-M 121-172
x
LIST OF TABLES
TABLE NO. TITLE PAGE
2.1 Propellant ingredients used for composite solid propellant 9
2.2 Example of the ingredients in AP based solid propellants 10
2.3 Example of additives in the AP based solid propellant 11
2.4 HTPB as polymeric binder 13
2.5 Aluminum as metallic fuel 18
2.6 Comparison of crystalline oxidizers 19
2.7 Ammonium perchlorate as an oxidizer 20
2.8 Three common particle-size ranges for AP 20
2.9 Classifications of BEM 25
2.10 Summary for binder 32
2.11 Summary for metal fuel 33
2.12 Summary for oxidizer 34
2.13 Summary for additives 35
2.14 Summary for strand burner 36
2.15 Summary for small ballistic evaluation motors 37
2.16 Summary for full-scale motors 38
3.1 Percentage of the ingredients 41
3.2 Enthalpy of formation (hf) for every compounds (at 298K) 43
3.3 Values for Linear Interpolation 44
3.4 Molecular weight, mole and mass each species of reactants
and products 46
3.5 Specific heat solid (Cs) and gas (Cp) 47
3.6 Comparison between manual calculation and output from
CEC71. 51
4.1 Formulation of thirteen set of different mixtures. 55
xi
5.1 Effect of combination of each ingredient 69
5.2 Observations 69
5.3 Average burn rate at pressure 1 atm 81
5.4 Average burn rate for four selected composition 81
5.5 Data for log combustion pressure and log burning rate 87
5.6 Empirical constant and pressure exponent 90
6.1 Specification of the propellant grain 99
6.2 Input data for nozzle throat 25 mm 105
6.3 Propellant performance for nozzle with throat 25 mm 106
6.4 Input data for nozzle throat 30 mm 108
6.5 Propellant performance for nozzle with throat 30 mm 108
7.1 Characteristics of the propellant from burning rate test 111
xii
LIST OF FIGURES
FIGURE NO. TITLE PAGE
2.1 Effect of mass fraction of HTPB on the burning rate and
adiabatic flame temperature of AP-HTPB propellants 13
2.2 Sample of aluminum particles under SEM 16
2.3 REM photograph of the conventional aluminum YX 76 16
2.4 REM photograph of the Alex powder 17
2.5 A chimney-type strand burner 23
2.6 Typical 2-inch BEM 24
2.7 Definition of burning time and action time 25
2.8 Example for free standing grain for KNO3-Carbon
propellant 27
2.9 Examples for case-bonded grains and igniter
configuration 28
2.10 Grain design and thrust vs. time 29
2.11 Burning rate of propellant 30
4.1 Example of casting aluminized/HTPB propellant 53
4.2 Simplifications on the methods of manufacturing the
propellants strand 55
4.3 Roller milled 57
4.4 Sample for AP particle before grinding 57
4.5 Sample of AP particle after grinding 58
4.6 Preparation of the propellant mixture 60
4.7 Strand wrapped with white tape 62
4.8 Strand ready dried before storage 62
4.9 AP/HTPB and Aluminized AP/HTPB propellant 63
4.10 cross sectional view of propellant p80 64
xiii
5.1 Combustion mechanism of AP particles and HTPB binder 66
5.2 Low pressure temperature profile 67
5.3 High pressure temperature profile 67
5.4 Flame of the propellant strand 70
5.5 Assembly view of 550 Psi strand burner 71
5.6 Example of strand mounting 72
5.7 Schematic diagram of the strand burner facility 72
5.8 Propellant strand 73
5.9 Actual burning time of the solid propellant at specified
length 74
5.10 Burning rate in atmospheric air and nitrogen gas 80
5.11 Burning rate at 1 atm for all formulations 82
5.12 Burning rate-O/F mixture ratio relationship 83
5.13 Effect of AP mass percentage on the burning rate of a 50
μm propellant 84
5.14 Burning rate-pressure relationship 85
5.15 Logarithmic plot of burning rate for all propellant
formulations 90
5.16 Effect of Al concentration on burning characteristics 91
5.17 Effect of AP concentration on burning characteristics 92
6.1 Test bed 95
6.2 Pendulum holder for static thrust testing 95
6.3 Attachment of load cell to the rocket motor 96
6.4 Nozzle of the rocket motor 97
6.5 Igniter (I80) 98
6.6 Dimension of the propellant grain 98
6.7 End of grain with silicone RTV 99
6.8 Installation of igniter on the rocket motor 100
6.9 Static thrust testing for propellant p66 102
6.10 Solid precipitation on the nozzle 103
6.11 Graph for the nozzle with throat diameter of 25 mm 104
6.12 Graph for the nozzle with throat diameter of 30 mm 107
6.13 Propellant performance in two different throat diameters 109
xiv
LIST OF SYMBOLS
A - Cross sectional surface area for the propellant strand
a - Empirical constant
AFT - Adiabatic flame temperature
AN - Ammonium nitrate
Al - Aluminum
Al2O3
- Aluminum oxide
AO - Ammonium oxalate
AP - Ammonium perchlorate
atm - Atmosphere
aij
- Number of atoms element i on the molecular formula
AlOHCl2 - Gidroksoalyuminiya chloride
BEM
- Ballistic evaluation motor
BE - Beryllium
CEA
- Chemical equilibrium application
CRV7
- Canadian Rocket Vehicles 7
C17
- Canadian 17
CTPB
- Carboxyl terminated polybutadiene
CO - Carbon monoxide
CO2 - Carbon dioxide
C - Carbon
Cl - Chlorine
sC
- Specific heat solid, -1 -1J mol K
pC
- Specific heat gas, -1 -1J mol K
gaspC
- Specific heat of gaseous, -1 -1J mol K
mixpC
- Specific heat of mixture, -1 -1J mol K
*c
- Characteristic exhaust velocity, -1m s
xv
FC
- Thrust coefficient
DAE
- Department of Atomic Energy
DAQ - Data acquisition system
DDI - Dimeryl-diisocyanate
DOA - Dioctyl adipate
DOP - Dioctyl phatalate
etc. - et cetera
FE2O3 - Ferum oxide
g - Gas or a vapor
og - Gravity, (9.81 -2m s )
HTPB - Hydroxyl terminated polybutadiene
HTPS - Hydroxy-terminated polyester
HTPE - Hydroxy-terminated polyether
HTPA - Hydroxy-terminated polyacetylene
2H - Hydrogen
2H O
- Water
HCl
- Hydrogen Chloride
H
- Hydrogen (atom)
HC
- Hydrocarbon
ISRO
- India Space Research Organization
IPDI
- Isophorone diisocyanate
spI - Specific impulse, sec
IDP
- Isodecyl pelargonate
JANAF
- Join Army-Navy- Air Force
KNO3 - Potassium nitrate
KClO4 - Potassium perchlorate
K - Kelvin
mixk - Specific heats ratio of mixture
kg - Kilogram
LiClO4 - Lithium perchlorate
log - Logarithm to the base 10
Lp
- Measured propellant length (mm)
l - Liquid
xvi
MDI - Methylene diphenyl diisocyanate
Mg - Magnesium
MSDS - Material safety data sheet
smol - Mole of species
sm - Mass of species
s - Molecular weight species
- Effective molecular weight
M - Mach number
strandm - Mass of strand
tm - Total mass
MAPO - Tris[ l-(2-methyl) aziridinyl] phosphine oxide
NASA - National Aeronautics and Space Administration
NG - Nitroglycerin
NC - Nitrocellulose
NA - Not available
NH4ClO4 - Ammonium perchlorate
N2 - Nitrogen
N - Nitrogen
n - Number of species
jn - Mol of molecule in the balance chemical equation
in
- Number of moles of gas components
sn
- Number of moles of condensed component
n
- Total number of moles gas
NaNO3 - Sodium nitrate
O/F
- Oxidizer to fuel mixture ratio
ODI
- Octadecylisocyanate
O
- Oxygen
OH - Hydroxide
P - Absolute pressure
aP - Atmospheric pressure
Pc
- Chamber pressure, bar
PBAN - Polybutadiene acrylonitrile
xvii
PU - Polybuatadiene
Psi - Pound per square inch
fP - Final pressure
r - Burning rate, -1mm sec
oR - Universal gas constant, 8.314 -1 -1J mol K
specificR - Specific gas constant, -1 -1J mol K
RTV - Room-temperature vulcanizing
SRP - Solid rocket propellant
S.E.M - Scanning electron microscope
S.W.G - Standard wire grade
TDI - Toluene-2,4 diisocyanate
TiO2 - Titanium Oxide
TPB - Triphenyl bismuth
eT - Temperature at exit condition, K
bt - Burning time, sec
fT - Final temperature, K
UFAL - Ultra Fine Aluminum
.s bV - Volume of strand burner, 3m
Zr - Zirconium
ΔU - Change in internal energy, -1kJ mol
ΔH - Change in enthalpy, H=U+PV, -1kJ mol
H - Heat of combustion, -1kJ mol
Δ - The increment in a given property for a given process or reaction,
taken as the value for the final state (or sum for the products) less
that for the initial state (or sum for the reactant)
o
fH - Standard enthalpy of formation, in which is the increment in
enthalpy associated with the reaction of forming the given
compound from its elements in their reference states, with each
substance in its thermodynamic standard state at the given
temperature, -1kJ mol
xviii
LIST OF APPENDICES
APPENDIX TITLE PAGE
A Guide for using CEC71 Program 121
B Output of NASA CEC71 for propellant70 131
C Heat of formation 135
D Mass of products and reactants 136
E Performance analysis 138
F Drawing of strand burner 142
G Electronic timer 149
H Sample preparation and testing procedure for
burning rate test
153
I Example results from burning rate 157
J Drawing of rocket motor 158
K Fabrication of the propellant grain 168
L Example results from static thrust testing 170
M Manual calculation for rocket performance 172
1
CHAPTER 1
1. INTRODUCTION
Ammonium perchlorate (AP) has been used as a major propellant ingredient
for decades in ballistic missiles, military attack missiles, space applications, etc. It is
known for its advantages as an oxidizer for solid propellant. Two main advantages of
AP are, its stability, resulting in safe munitions, and its ability to control a propellant‟s
burning rate.
There were a lot of studies from those who used AP based propellant and
some of the data are already existed. However, there is no complete information on
the characteristic of the baseline data of AP based solid rocket propellant as well as
the device and technique used to get the data. Knowing the limited data and technique
used is not enough since other parameters such as the size and type of device used to
generate the baseline data is not fully taken into account, then the data cannot be
correctly interpreted and errors due to the scale up may result.
Fundamental study had been conducted to obtain the data of characteristic for
AP based solid propellant by using facilities available in UTM. The current study was
based on a typical and established heterogeneous or sometimes called composite
propellant composed of ammonium perchlorate (AP) as an oxidizer, aluminium (Al)
as a metal fuel, hydroxyl terminated polybutadiene (HTPB) as a binder and
isophorone diisocyanate (IPDI) as a curative agent. In this study, by varying the
oxidizer-fuel mixture ratio it is possible to achieve different propellant burning rates.
The burning characteristics of propellant were obtained by using a strand burner.
2
The performance characteristics of AP base solid rocket propellant (SRP) was
evaluated using a ballistic evaluation motor (BEM) or also known as static thrust
testing to obtain another important parameter, which is the specific impulse. Although
both measuring technique and devises used will introduce errors, accurate prediction
is possible by establishing a correlation between subscale test motor and strand burner
test.
1.1 Objective of the Study
To determine the combustion characteristics data of the developed ammonium
perchlorate based solid rocket propellant (SRP).
1.2 Scope of Study
I. Literature review on applications of AP in solid rocket.
II. Theoretical study on the performance of AP based SRP using NASA
CEC71 program.
III. Evaluate the burning rate of AP based SRP at different O/F ratio and at
different operating pressure using strand burner.
IV. Conduct the static thrust testing.
1.3 Research Methodology
The research was started with literature studies on rocket propellants,
especially solid rocket propellants. The study focused on the history and development
of rocket technology in the world. Then, the methods that could be used to measure
and analyze the burning rate of propellant had been studied and understood in order to
find the most appropriate method to be used with the facilities available in UTM.
3
Lastly, the basic ingredients that commonly used in composite solid propellants were
reviewed.
After that, theoretical study on the performance of AP based SRP were
conducted by using NASA CEC71 program. Based on the literature reviewed,
previous experience and the theoretical performance, thirteen sets of propellant
formulation were fabricated with a different oxidizer-fuel mixture ratio.
Initially, the burning characteristic of all propellant formulations were
evaluated at an atmospheric condition by using the strand burner. From that, four
main formulations were selected and tested at the elevated pressure range of 6 atm to
31 atm. Finally based from the theoretical evaluation by NASA CEC71 program, one
optimum mixture namely p66 had been chosen for static thrust testing to obtain the
performance characteristics. All the documentation of the work done and literature
review related to this study were continuously carried out throughout this research
study.
1.4 Outline of Report
The report on this study is divided into six chapters. Chapter 1 provides the
general introduction on the study and it include the objectives, scopes, research
methodology and outline report of the study was briefly explained.
Chapter 2 presents literature reviews on solid rocket propellants. The reviews
start with the history and development of rocket technology around the world. Then,
discussion on basic ingredients that commonly used in composite solid propellants is
presented. At the end of this chapter is a brief explanation on the methods that could
be used to measure and analyze the performance characteristics of a propellant.
Chapter 3 starts with the basic assumptions that must be made in order to
simplify the analysis of a rocket motor. Then an example of a propellant analysis of a
given propellant formulation is presented. After that, several theoretical approaches to
determine the thermochemical properties for a given propellant formulation such as
4
chamber pressure, nozzle dimensions, and nozzle exit pressure are briefly discussed.
Finally, it discussed the method utilized to determine the main performance parameter
such as theoretical specific impulse, characteristic exhaust velocity, thrust coefficient
and etc.
Chapter 4 discussed the three main contributors that significantly influence the
selection of a propellant formulation and they are the literature review data, NASA
CEC71 program and type of the fabrication method to be used. Then, the methods of
preparing the ingredients were shown and explained which later followed by the
mixing procedure. Finally the method that is used to prepare the propellant mixture
and fabrication of the propellants strand for burning rate test is briefly explained.
Chapter 5 explained the methods and facilities employed for burning rate test.
Firstly, the propellants were tested in the strand burner at the ambient pressure by
using wire technique to obtain the initial burning characteristics. Then, four propellant
compositions which are the p60, p66, p74 and p80 were selected for further
evaluation over a range of pressures from 6atm to 31atm. The results obtained were
analyzed to find the effect of oxidizer-fuel mixture ratio and chamber pressure to the
burning characteristics of the propellant.
Chapter 6 discussed the static thrust testing that was conducted to obtain the
thrust time curve characteristics in order to obtain the actual performance of a solid
propellant. Final chapter summarized several conclusions and recommendations that
could be considered for the next researcher to improve and advancing further the
research on ammonium perchlorate based solid propellant.
5
1.5 Limitation of Study
1. The fabrication of the propellant only utilized press molding method without
detailed study on other methods such as casting and extrusion. There was also
no study on the effects of varying compression pressure to the burning rate
and mechanical properties of the propellant.
2. The purpose of utilizing SEM was to study the structure of the solid loading
such as aluminum and ammonium perchlorate in the propellant grain. There
was no detailed study on eliminating bubbles in the propellant.
3. The purpose of static thrust test was to obtain the thrust and some performance
characteristics. Due to the limitation of scope, there was only two static thrust
testing were conducted.
113
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