Ideal Otto Cycles for I.C. Engines

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Presentation transcript:

Ideal Otto Cycles for I.C. Engines P M V Subbarao Professor Mechanical Engineering Department Improved Thermodynamic Structure of an Engine…

Fuel calorific value (kJ/kg) Ford ECOSPORT Details 1.5P Ambiente Displacement (cc) 1499 Max Power output(kW) 82@6300RPM Max. Torque (Nm) 140@4400RPM Compression Ratio 11:1 Fuel calorific value (kJ/kg) 48,000

Ideal Otto & Carnot Cycles

Analysis of Otto Cycle

Engine Specifications due to an Ideal Otto Cycle

Thermodynamic Performance Parameters

Thermo-chemical Performance Parameters

Other components of Petrol Name of Hydro-carbon Sample 1 Sample 2 Formula Ethanol 13.40% 12.10% C2H6O 2-methyl-pentane 10.20% 4.50% C6H14 Hexane 0% 2.10% Pentane 5.50% 3.70% C5H12

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

First Order Models for Variable Specific Heats

Isentropic expansion model with variable properties For expansion from 3 to 4:

First Order Models for Specific Heat at Constant Volume

Isentropic expansion model with variable properties For expansion from 3c to 4c: