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santeria13

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## Homework Statement

A diesel engine works on the dual combustion cycle and has a compression ratio of 20/1. At the beginning of the compression process the pressure and temperature are 1.0 bar and 22°C respectively. In the cycle, heat is added at constant volume until the pressure has increased by 50% and then at constant pressure for 7% of the swept volume. For air assume k= 1.4; cv = 0.718 kJ/kg K; cp = 1.005 kJ/kg K.

Calculate for the cycle: a) The temperature at the remaining state points in the cycle; (5 marks)

## Homework Equations

V3/V4 = cutoff ratio (rc) V2/V1 = compression ratio (r) = 20/1 P3/P2 = pressure ratio(rp)

T2 = T1 * (r)^k-1

T3 = T1 * (r)^k-1 * rp

T4 = T1 * (r)^k-1 * rp *rc ----------------- confused on how to calculate the cutoff ratio(rc)

## The Attempt at a Solution

Calculated all figures up until T4 at which the cutoff ratio is required.

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