Asked Mar 6, 2019

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?


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.


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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