Derive the expression for efficiency in a Diesel cycle.

Question

24 Feb 2025

Answer :

Word Count : 556

The Diesel cycle, also known as the constant-pressure cycle, is commonly used in compression ignition (CI) engines. It consists of four processes: two adiabatic (isentropic) processes, one constant-pressure heat addition process, and one constant-volume heat rejection process. To derive the expression for the efficiency of a Diesel cycle, we analyze these processes thermodynamically.

### Processes in the Diesel Cycle:
1. Process 1-2: Isentropic Compression (Reversible Adiabatic Compression)
- The working fluid (air) is compressed adiabatically from state 1 to state 2.
- There is no heat transfer in this process.

2. Process 2-3: Constant Pressure Heat Addition
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