Chapter 21, Problem 19P

An idealized diesel engine operates in a cycle known as the air-standard diesel cycle shown in Figure P21.19. Fuel is sprayed into the cylinder at the point of maximum compression, B. Combustion occurs during the expansion B → C, which is modeled as an isobaric process. Show that the efficiency of an engine operating in this idealized diesel cycle is

$e=1-\frac{1}{\text{γ}}\left(\frac{T_D-T_A}{T_C-T_B}\right)$

Figure P21.19