When diesel cycle efficiency is maximum?

Question

When diesel cycle efficiency is maximum?

Answer 1

*Maximum thermal efficiency:

The maximum thermal efficiency of a diesel cycle is dependent on the compression ratio and the cut-off ratio. It has the following formula:

ηth={1 - [1/ r ^ (γ-1)] } *{α^γ - 1 / γ [α - 1] }

Where,

ηth is thermal efficiency

α is the cut-off ratio  (ratio between the end and start volume for the combustion phase)

r is the compression ratio  

γ is ratio of specific heats (Cp/Cv)

*Cut-off ratio is given by the ratio of the volume at end of combustion to that of the clearance volume.

http://en.wikipedia.org/wiki/Diesel_cycl...