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# Compression Ratio Vs. Compression Pressure - PowerPoint PPT Presentation

Compression Pressure. Compression Ratio. Compression Ratio Vs. Compression Pressure. Definition: __________________________________________________________________________________________. Definition: __________________________________________________________________________________________.

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Compression Ratio

### Compression Ratio Vs. Compression Pressure

Definition:__________________________________________________________________________________________

Definition: __________________________________________________________________________________________

Boyle’s law: ______________________________________________________

Isothermal: ______________________________________________________

How is it obtained?______________________________________________________

How is it obtained? ______________________________________________________

Typical range of values:__________________

Typical range of values: __________________

• An engine has a static compression ratio of 9:1

• What would the cylinder pressure be if compression was perfectly isothermal? (assume no leakage) Pcompression =C.R. X Patmospheric

• What would the cylinder pressure be if compression was perfectly Adiabatic? (assume no leakage) Pcompression =Patmospheric X C.R.1.4

• If this engine made 200 p.s.i.g. on the compression tester, would it be closer to isothermal or adiabatic compression?

• What is the adiabatic index used in this formula?

• What does the adiabatic index describe?