Fuel-Air Modeling of IC Engine Cycles - 1

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Presentation transcript:

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 More realistic representation of Compression???

Realization of Available Air : Running Cost Vs Capital Cost

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. Process SI Engine CI Engine Intake Air+Fuel +Residual gas Air+ Recycles gas + Residual gas Compression Air+Fuel vapour +Residual gas Expansion Combustion products Combustion Products Exhaust

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

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.

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

Variation of Specific Heat of Ideal Gases Air 1.05 -0.365 0.85 -0.39 Methane 1.2 3.25 0.75 -0.71 CO2 0.45 1.67 -1.27 0.39 Steam 1.79 0.107 0.586 -0.20 O2 0.88 -0.0001 0.54 -0.33 N2 1.11 -0.48 0.96 -0.42

g cp cv

Properties of Fuels C0 C1 C2 C3 C4 Fuel Methane -0.29149 26.327 -10.610 1.5656 0.16573 Propane -1.4867 74.339 -39.065 8.0543 0.01219 Isooctane -0.55313 181.62 -97.787 20.402 -0.03095 Gasoline -24.078 256.63 -201.68 64.750 0.5808 Diesel -9.1063 246.97 -143.74 32.329 0.0518

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

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

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

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