M-COMBUSTION CHAMBER AND COLD STARTING OF C.I ENGIINES

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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 the
  assumption that the combustion process was taken
  to be only a heat addition process and the
  in-cylinder conditions are spatially uniform. as
  the heat release model, the well known wiebes
  combustion function and the white house-ways
  heat release model were studied and successfully
  employed to the combustion simulation
• A comparison has been made between the
  predicted results of the cylinder pressure and
  rate of heat release and the measured data ,
  and showed that the predictions agreed well with
  the measured data.

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INTRODUCTION-

• The thermodynamic cycle analysis and the
  performance prediction of diesel engines using
  the engine cycle simulation programs has become
  an established part of the diesel engine
  research and development.
• Particularly ,the engine simulation programs
  based on the single-zone combustion model are
  widely used by most engine manufacturers because
  of simplicity and low operating cost in spite of
  their short comings in accuracy.
• These programs can readily utilized for the
  prediction of cylinder firing pressure for the
  stress analysis of main engine parts,
  investigation of engine design via parameter
  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 171
BORESTROKE,MM 121150
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 SYSTEM

• The M system is a kind of direct injection
  combustion system . However , the M system does
  not distribute the fuel in the air initially, but
  sprays it with a single-hole nozzle onto the oil
  cooled wall of the spherical combustion chamber,
  where it spreads to form a thin film.
• The fuel is injected in the direction of a high
  speed air swirl which is produced during the
  suction stroke of the engine by the helical inlet
  ports.
• The orientation of the fuel jet parallel with the
  air swirl reduces the relative velocity between
  the air and fuel jet which, coupled to a short
  distance between nozzle combustion chamber wall,
  helps to prevent the fuel jet being broken up to
  any great extent.

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• This means that during injection only a
  relatively small portion of the fuel is mixed
  with the air and prepared for ignition.
• Therefore, independent of the temperature and
  stress level of the engine, there is only a very
  small amount of air/fuel mixtures ready for the
  reactions that precede combustion.
• As a result, the initial rate of heat released is
  slowed down considerably and quiet, controlled
  combustion cycle achieved.

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THERMODYNAMICS OF COMBUSTION PROCESSES
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COMBUSTION MODEL
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CALCULATION RESULTS
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EFFECT OF PARAMETERS ON THE CYLINDER PRESSURE AND
THE RATE OF HEAT RELEASE IN THE TWO WIBE
FUNCTIONAL MODEL
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EFFECT OF PARAMETERS ON THE CYLINDER PRSSURE AND
THE RATE OF HEAT RELEASE IN THE WHITE HOUSE WAYS
MODEL
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COMPARISION OF EXPERIMENTAL AND PREDICTED RESULTS
FOR TEST ENGINE AT RATED SPEED AND PEAK TORQUE
SPEED
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COLD STARTING OF I.C ENGINES
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ASTRACT-
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INTRODUCTION-
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S.I ENGINES-
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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-