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Fuel-Air Modeling of IC Engine Cycles - 1

Fuel-Air Modeling of IC Engine Cycles - 1. P M V Subbarao Professor Mechanical Engineering Department. State of the Art Modeling of Artificial Horses.…. History Innovation : Artificial Horse. The Important part of Cycle is Executed in CM Mode.

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Fuel-Air Modeling of IC Engine Cycles - 1

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  1. Fuel-Air Modeling of IC Engine Cycles - 1 P M V Subbarao Professor Mechanical Engineering Department State of the Art Modeling of Artificial Horses.….

  2. History Innovation : Artificial Horse

  3. The Important part of Cycle is Executed in CM Mode More realistic representation of Compression???

  4. Realization of Available Air : Running Cost Vs Capital Cost

  5. Fuel-Air Models for Engine Cycles • Fuel-air analysis is more realistic analysis when compared to Air-standard cycle analysis. • An accurate representation of constituents of working fluid is considered. • More accurate models are used for properties of each constituents.

  6. Fuel – Air Otto Cycle Air+Fuel vapour +Residual gas TC Products of Combustion Products of Combustion BC Compression Process Const volume combustion Process Expansion Process Blow down of waste Products of combustion

  7. Fuel –Air Otto Cycle • 1—2 Isentropic compression of a mixture of air, fuel vapour and residual gas without change in chemical composition. • 2—3 Complete combustion at constant volume, without heat loss, with burned gases in chemical equilibrium. • 3—4 Isentropic expansion of the burned gases which remain in chemical equilibrium. • 4—5 Ideal adiabatic blow down.

  8. Isentropic Compression Process For a infinitesimal compression process: Use appropriate EoS: Mass averaged properties for an ideal gas mixture:

  9. Variation of Specific Heat of Ideal Gases

  10. g cp cv

  11. Properties of Fuels

  12. True Phenomenological Model for Isentropic Compression Let the mixture is modeled as:

  13. First Order Models for Variable Specific Heats ap = 0.9718 – 1.1 kJ/kg.K bv = 0.685 – 0.823 kJ/kg.K k1 = 1.32610-4 – 3.39510-4 kJ/kg.K2

  14. Isentropic Compression model with variable properties • For compression from 1 to 2:

  15. Phenomenological Modeling of Combustion • Engineering Objective of Combustion: • To Create Maximum Possible Temperature through conversion of microscopic potential energy into microscopic kinetic energy. Thermodynamic Strategy for conversion: Constant volume combustion Constant pressure combustion

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