At the beginning of the compression of an otto cycle the air temperature is 300k

Question

At the beginning of the compression of an otto cycle the air temperature is 300k and p1=atm. the compression ratio is 8. Max temperature is 2000k. Consider a cold air analysis and use k=1.4/ Cv=0.718 kj/kgK/ Cp=1.005 kj/kgK. Sketch the cycle using a P-V diagram, calculate max pressure, and heat transfer into the cycle per unit mass in kj/kg.

Explanation / Answer

(T2/T1) =(P2/P1)^(Y-1)/Y => (T2/300) = (P2/1)^(0.4/1.4) => (1/300)^(14/4) = P2/T2 NOW FROM 2-3: maximum pressure at state 3: P3/T3 = P2/T2 => P3 = T3 * (P2/T2) P3 = 2000* [(1/300)^(14/4)] ATM........ANSWER

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