Engineering Thermodynamics
Diesel cycle consists of following four processes

Two isentropic, one constant volume and one constant pressure
Two isentropic and two constant volumes
Two isothermal and two isentropic
Two isentropic and two constant pressures

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Engineering Thermodynamics
Work-done during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

(p1 v1 - p2, v2)/(γ - 1)
[m R T1/(γ - 1)][1 - (p2, v2 /p1 v1)]
All of these
[m R (T1 - T2)] /(γ - 1)

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