electric propulsion system setup s 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 10 11 from pcdu s/c communication...
TRANSCRIPT
Electric Propulsion System Setup
# Component Mass [kg] Power [W] Price [$ US]
1 Tank Heating Coil 0.25 5 --
2 Xenon Storage Tank 21 -- 130000*
3 Tank Multi-Layer Insulation -- -- --
4 Solenoid Latch Valve 0.3 4 35,000
5 Pressure Regulator 0.55 -- 20,000
6 High Purity Filter 0.2 -- 5,000
7 Sintered Flow Restrictors 0.4 -- 600
8 Feed System Heating Coil 0.25 5 --
9 Thruster Radiator Sleeve 2 -- 500
10 Hall Thruster 5.7 see PPU 230,000
11 Power Processing Unit 10 1244 535,000
12 Feed Lines 1 --- --
13 Power / Intercomm Harness 2 -- --
14 Xenon Propellant 139 -- 204,000
TOTAL PROP SYSTEM 169 1539 1,030,100
TOTAL IMLEO 418
XENON TANK
S
P
HALL THRUSTER
P
T
PPU T 1
2
3
45
6
7
8
10
11
From PCDUS/C Communication
9
Xenon System
Thermal System
Power / Intercomm
0.2 m
• No redundancies, no integration costs
Electric Propulsion System Specifications
Specifications for the Hall Thruster – 100g Mission
Variable Value UnitsThrust 78.5 mNSpecific Impulse 1950 sMass Flow Rate 4.1 mg/sPower Input 1526 WEfficiency 0.53 --Input Voltage 350 VDCMass 5.7 kg
Propulsion System Totals – 10kg Mission
Variable Value UnitsWet Mass 215 kgDry Mass 30 kgRequired Power 2,043 WattsBurn time 365 daysThrust 104 mNSpecific Impulse 1964 sMass flow Rate 5.4 mg/s
Specifications for the BHT-8000 Hall Thruster – Large Mission
Variable Value UnitsThrust 424 mNSpecific Impulse 2250 sMass Flow Rate 19.2 mg/sPower Input 7,600 WEfficiency 0.64 --Mass 25 kg
Propulsion System Totals - Large Mission
Variable Value UnitsWet Mass 3,810 kgDry Mass 520 kgRequired Power 38,773 WattsBurn time 365 daysPayload Capability 4,545 kg
• LOx/LH2 would require an extra 600 kg, costing an extra $2.6M
• An ion thruster could accomplish the mission, but would require much more power than the HET
• Current technology places HET lifetime over 1 year
Other Propulsion Options
Xenon Storage Thermal Analysis
SupercriticalStorageRegion
Gas
Liquid
Allowed temperature path of propellant
• Maximize storage pressure for volume efficiency (~ 150 bar)• Maintain tank temperature for gaseous Xenon phase: Balance heat due to radiation and pressure drop with a 5 watt resistance heater
•Curve data from National Institute of Standards and Technology
Temperature (K)