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?

Step 1

Given that ,

Total Volume = Volume of the cylinder before compression V_{1} = V_{s} + V_{c} = 80 in^{3}

Clearance volume (V_{c}) = Volume of the cylinder after compression V_{2 } = 15 in^{3}

Pressure before compression = intake pressure (P_{1}) = ???

Pressure after compression = pressure at TDC (P_{2}) = 130 psia

Step 2

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

Therefore,

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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