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A turbocharged aircraft engine cylinder has a total volume of 80 cu. in. and a clearance volume of 15 cu. in. The pressure in the cylinder when the piston is at TDC (Top Dead Centre) is 130 PSIA (130 pounds per square inch absolute). What is the absolute pressure in the intake manifold? What is the compression ratio?

Question

A turbocharged aircraft engine cylinder has a total volume of 80 cu. in. and a clearance volume of 15 cu. in. The pressure in the cylinder when the piston is at TDC (Top Dead Centre) is 130 PSIA (130 pounds per square inch absolute). What is the absolute pressure in the intake manifold? What is the compression ratio? 

check_circleAnswer
Step 1

Given that ,

Total Volume = Volume of the cylinder before compression V1 = Vs + Vc = 80 in3

Clearance volume (Vc) = Volume of the cylinder after compression V2  = 15 in3

Pressure before compression = intake pressure  (P1) = ???

Pressure after compression = pressure  at TDC (P2) = 130 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 reversible adiabatic compression process because reversible ad...

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