Wednesday, December 22, 2010

Diesel Cycle

Diesel Cycle

The Diesel cycle is an ideal air standard cycle which consists of four processes:
  • 1 to 2: Isentropic compression
  • 2 to 3: Reversible constant pressure heating
  • 3 to 4: Isentropic expansion
  • 4 to 1: Reversible constant volume cooling
By defining the compression ratio, r, as:

and cut-off ratio, , as:

The thermal efficiency of an Diesel cycle with a perfect gas as working fluid is:

n=  = a constant depending on specific heat capacity