EXPERIMENTAL AND NUMERICAL INVESTIGATION OF MILLER CYCLE IN A TURBOCHARGED LHR DI DIESEL

ENGINEIC 772-PROJECT PHASE-II

BY

D.MANIVANNAN200821128

UNDER THE GUIDANCE OF Dr.P.TAMILPORAI

PROFESSOR&HEADINTERNAL COMBUSTION ENGINEERING DIVISION

MECHANICAL ENGINEERING DEPARTMENTCOLLEGE OF ENGINEERING GUINDY

ANNA UNIVERSITY CHENNAICHENNAI-600 025.

OBJECTIVE

• To analyse the Miller cycle effect on a turbocharged LHR DI diesel

engine.

• To achieve higher thermal efficiency for a turbocharged LHR DI diesel

engine with low NOx level.

INTRODUCTION

• The principle of operation is based on a low effective compression ratio

and high expansion ratio.

• The short compression stroke is achieved by closing the intake valve late

after BDC for better volumetric efficiency when compared to early intake

valve closing.

• Miller cycle is one of the emission control method to reduce the NOx

emission. It is achieved by means of engine modification technology.

ADVANTAGES OF MILLER CYCLE

• Lower compression temperature for lower cylinder component stress

• Lower peak pressure

• Lower exhaust pressure

• Lower compression work

• Greater expansion work

METHODOLOGY

• Incorporating Miller cycle both in theoretical and experimental analysis by

means of valve timing modification to find its effects on NOx level from

turbocharged low heat rejection engine.

• Theoretical results and experimental results of combustion, performance

and emission characteristics is to be analysed.

VALVE TIMING DIAGRAMS

MILLER CYCLE DIESEL CYCLE

Inlet valve opens at 8˚ BTDC Inlet valve opens at 8˚ BTDC Inlet valve closes at 60 ˚ATBDC Inlet valve closes at 45˚ATBDCExhaust valve opens at 45˚ BBDC Exhaust valve opens at 45˚ BBDCExhaust valve closes at 12˚ATDC Exhaust valve closes at 12˚ATDC

Fig. Miller cycle applied to Diesel Engine

E

C D

A B

V

P

E

C D

A B

EXPERIMENTAL PROCEDURE

• Experiment is to be carried on different load in a turbocharged multicylinder DI

diesel engine by using diesel as a fuel.

• Cam lobe is to be designed for late inlet valve closing.

• Experiment is to be carried out with a new camshaft with same fuel consumed at various speeds.

• The peak pressure inside the cylinder is to be measured by using a pressure transducer, charge amplifier and cathode ray oscilloscope setup.

• The exhaust gas emission is to be measured by using the exhaust gas

analyzer.

ENGINE SPECIFICATON

ENGINE RUSTON 4YDX, 4 CYLINDER, 4 STROKE, WATER COOLED DI DIESEL ENGINE

BORE(mm) 111.1

STROKE(mm) 127

COMPRESSION RATIO 15:1

CUBIC CAPACITY(cm3) 4928

RATED SPEED(rpm) 1500

RATED POWER 55.2 kW @ 1500 rpm

FUEL INJECTION PRESSURE (bar)

210

BSFC@FULL LOAD (g/kWh)

265

EXPERIMENTAL SET-UP 1.   Engine

2. Hydraulic dynamometer

3.      Fuel pump

4.      Radiator

5.      Inlet line

6.      Exhaust line

7.      Air surge tank

8.      Compressor

9.      Turbine

10.  Exhaust gas analyzer

11.  Fuel tank

12.  Crank angle encoder

13.  Charge amplifier

14.  CRO

Schematic view of experimental setup

TEST ENGINE CAMSHAFT

MILLER CYCLE CAMSHAFT

WORKDONE SO FAR

REFERENCES

• Al-Sarkhi.A,Jaber.J.O, “Efficiency of a Miller Engine”. Apllied Energy83(2006) 343-35.

• Bo Yang, Philip Keller, “Analysis of Diesel Engine Emissions Reduction by Late Intake Valve Close and VGT Turbocharger Using 1-D Simulation”. SAE-2008-01-2444.

• Gopalakrishnan.K.V, Nazar.J, “Naturally-Aspirated Low-Heat Rejection Single Cylinder Extended Expansion (Miller Cycle) C.I. Engine”.SAE-970202.

• Hansruedi Stebler, German Weisser, “Reduction of NOx emissions of DI Diesel engines by application of the Miller system : An Experimental and Numerical investigation”. SAE 960844.

• Jerald A.Caton, “Results from an Engine cycle simulation of compression ratio and expansion ratio effects on engine performance”, Journal of Engineering for Gas Turbines and Power, ASME-052809.

REFERENCES(Contd…)

• Kentfield, “Extended and Variable, stroke Reciprocating Internal Combustion Engines”. SAE 2001-01-1941.

• Nagesh Mavinahally and and Roy Kamo, “Insulated Miller cycle Diesel engine”.SAE 961050.

• Yaodong wang, “Application of the Miller cycle to reduce NOX emissions from petrol

engines”. Applied energy 85(2008), 463-474.

• Tamilporai P., “Simulation and analysis of combustion and heat transfer in low heat rejection

engine using two - zone combustion model and different heat transfer models”, SAE paper

2003-01- 1067.

• Heywood J.B., Internal Combustion Engine Fundamentals, McGraw Hill Book Co., 1988.

• Rowland S.Benson, White House N.D., Internal Combustion Engine, Pergamon Press Ltd,

1979.

• Ganesan V., Computer Simulation of Compression-Ignition Engine Processes, Universities

Press (India) Limited, 2000.

THANK YOU