Question
Download Solution PDFMost high-speed compression engines operate on
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
- A dual cycle or limited pressure cycle is a thermodynamic cycle for high-speed diesel and hot spot ignition engines.
- Whether heat is added at constant pressure or constant volume in actual applications, depends upon the rate of heat added and the rate at which pressure decreases due to movement of the piston.
- In an ideal cycle, the piston is assumed stationary during heat addition at constant volume, but in practice, this does not happen.
- As the speed of the engine increases, the rate of decrease of pressure due to the movement of the piston increases, and heat addition cannot be assumed at either constant volume or constant pressure.
- In such a case, a better approach for modeling the situation will be to assume heat addition initially at constant volume and then at constant pressure. That is why a dual combustion cycle is used.
- All diesel engines except slow-speed engines use mixed dual cycles.
- This is because in mixed dual cycles the heat input occurs partially at constant volume and partially at constant pressure.
Last updated on Jul 1, 2025
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