m combustion chamber and cold starting of c

8/13/2019 m Combustion Chamber and Cold Starting of c

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M-COMBUSTION CHAMBER AND COLD

STARTING OF C.I ENGIINES


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M- COMBUSTION CHAMBER


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ABSTRACT:-

In this paper, a combustion simulation model for a 4-stroke, direct injection diesel engine is described.

The combustion modeling was based on theassumption that the combustion process was taken to be

only a heat addition process and the in-cylinder conditionsare spatially uniform. as the heat release model, the wellknown wiebescombustion function and the white house-ways heat release model were studied and successfullyemployed to the combustion simulation

A comparison has been made between the predictedresults of the cylinder pressure and rate of heat releaseand the measured data , and showed that the predictionsagreed well with the measured data.


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INTRODUCTION:-

The thermodynamic cycle analysis and theperformance prediction of diesel engines using theengine cycle simulation programs has become anestablished part of the diesel engine research anddevelopment.

Particularly ,the engine simulation programs based onthe single-zone combustion model are widely used bymost engine manufacturers because of simplicity andlow operating cost in spite of their short comings inaccuracy.

These programs can readily utilized for the predictionof cylinder firing pressure for the stress analysis ofmain engine parts, investigation of engine design viaparameter studies


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EXPERIMENTATIONS:-

This was a 4-stroke ,water-cooled , in-line 6-

cylinder , direct injection and turbocharged diesel

engine having M type combustion chamber.

ITEM SPECIFICATIONS

ASPIRATION TC

COMPRESSION RATIO 17:1

BORE*STROKE,MM 121*150

RATED OUTPUT,KW 188/2200

PEAK TORQUE,NM/RPM 892/1400


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The cylinder pressure was measured by a

piezo-quartz pressure transducer (AVL-

8QP3000) and AVL indicating system equipped

with amplifier (AVL type 3059),control

unit(AVL type 3059), control unit (AVL type

4004)and 4-channel oscilloscope (Tektronix

type 5103N).


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M COMBUSTION SYSTEMThe M system is a kind of direct injection combustion

system . However , the M system does not distributethe fuel in the air initially, but sprays it with a single-hole nozzle onto the oil cooled wall of the sphericalcombustion chamber, where it spreads to form a thinfilm.

The fuel is injected in the direction of a high speed airswirl which is produced during the suction stroke of theengine by the helical inlet ports.

The orientation of the fuel jet parallel with the air swirlreduces the relative velocity between the air and fuel

jet which, coupled to a short distance between nozzlecombustion chamber wall, helps to prevent the fuel jetbeing broken up to any great extent.


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This means that during injection only a relativelysmall portion of the fuel is mixed with the air andprepared for ignition.

Therefore, independent of the temperature andstress level of the engine, there is only a verysmall amount of air/fuel mixtures ready for thereactions that precede combustion.

As a result, the initial rate of heat released isslowed down considerably and quiet, controlledcombustion cycle achieved.


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THERMODYNAMICS OF COMBUSTION

PROCESSES


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CALCULATION RESULTS


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EFFECT OF PARAMETERS ON THE


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CYLINDER PRESSURE AND THE RATE OF

HEAT RELEASE IN THE TWO WIBEFUNCTIONAL MODEL


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CYLINDER PRSSURE AND THE RATE OF

HEAT RELEASE IN THE WHITE HOUSEWAYS MODEL


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COMPARISION OF EXPERIMENTAL AND

PREDICTED RESULTS FOR TEST ENGINE

AT RATED SPEED AND PEAK TORQUESPEED


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COLD STARTING OF I.C ENGINES


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ASTRACT:-


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INTRODUCTION:-


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C.I ENGINES:-


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ENGINE DESIGN:-


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LUBRICATING OIL:-


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EFFECT OF OIL VISCOSITY ON

CRANKING SPEED


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FUELS:-


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COOLANT AND BATTERY CONDITION:-


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FREEZING POINT OF THE MIXTURE OF

WATER AND GLYCOL


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STARTING MOTORS:-


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HEATERS:-


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TYPES OF FLUID STARTER USED IN IIP


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CONCLUSION:-

m combustion chamber and cold starting of c

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