Diesel Cycle: Explained with PV-TS Diagram, Efficiency, and Applications

Last Updated on May 20, 2025
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Diesel Cycle FAQs

This cycle is also referred to as a constant pressure cycle since heat is given at a constant pressure.

There are five stages of the Diesel Cycle: Suction (Intake of air), Compression (Air is compressed), Combustion (Compressed air is sprayed with diesel), Expansion (This is also referred to as power stroke where the gases explode and push the piston), and Exhaust (The gases after expansion are pushed out of the engine to allow fresh mixture intake).

The ratio of the volume after combustion to the volume before combustion is the fuel cut off ratio in diesel engine, and is mathematically represented as .

Rudolf Diesel invented the diesel cycle during the 1980s in Germany.

The mean effective pressure of diesel cycle is the ratio of the total work done to displace a given volume of the piston. Mathematically, . Here, = Stroke volume = Volume before compression - Volume after compression.

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