3. Assume an Otto cycle with compression ratio of CR = 9 : 1. The intake air is at 100kPa, 20 o C, and the volume of the chamber is 500cm 3 prior to the compression stroke. The temperature at the end...

3.

Assume an Otto cycle with compression ratio of

CR = 9 : 1. The intake air is at 100kPa, 20^oC, and the volume of the chamber is 500cm³
prior to the compression stroke. The temperature at the end of the adiabatic expansion is T₄
= 800K. If air specific heat capacity at constant pressure of air at atmospheric pressure and room temperature is c_p
= 1.01KJ/kgK. Specific heat capacity at constant volume of air at atmospheric pressure and room temperature:

c_v
= 0.718KJ/kgK.

Calculate:

(i)

the mass of the intake air;

(ii)

the temperature T₃;

(iii)

the pressure p₃;

(iv)

the amount of heat added by burning fuel-air mixture;

(v)

the thermal efficiency of the cycle;

(vi)

the mean effective pressure (MEP).