Question
Asked Mar 6, 2019
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An Aircraft engine cylinder has a piston displacement of 45 cu. in and a clearance volume of 10 cu in. If the intake pressure is 14.7 PSIA what is the absolute pressure when the piston is at TDC? What is the compression ratio?

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Expert Answer

Step 1

Given that ,

Piston displacement or swept volume (Vs) = 45 in3

Clearance volume (Vc) = 10 in3

Volume of the cylinder before compression V1 = Vs + Vc = 45 + 10 = 55 in3

Volume of the cylinder after compression V2 = Vc = 10 in3

Pressure before compression = intake pressure  (P1) = 14.7 psia

Step 2

Compression ratio is the ratio of volume before compression to volume after compression.

Therefore,

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Step 3

Since nothing is mentioned about the compression process ,let us assume the compression process to be reversible adiabatic process.

Mostly the compression processes  will be reversib...

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