Air Standard Diesel Cycle

diesel

Process 1-2

Isentropic Compression

\( W = \frac{P_2 V_2 - P_1 V_1}{1- \gamma} \)

\( Q = 0 \)

Process 2-3

Isometric Heat Transfer

\( W = P_2 (V_3 - V_2) \)

\( Q = m C_v \Delta T = \Delta H_{23} \)

Process 3-4

Isentropic Expansion

\( W = \frac{P_4 V_4 - P_3 V_3}{1- \gamma} \)

\( Q = 0 \)

Process 4-1

Isometric Heat Transfer

\( W = 0 \)

\( Q = m C_v \Delta T = \Delta U_{41} \)


Compression Ratio

\( r_v = \frac{V_1}{V_2} \)

Cut-off Ratio

\( r_c = \frac{V_3}{V_2} \)

Air Standard Efficiency

\( \eta _{th} = 1 - \frac{1}{r_v ^ {\gamma -1}} ( \frac{r_C ^\gamma -1}{\gamma (r_C -1)}) \)