Draw a free body diagram of a piston, connecting rod and crank shaft. Indicate on the...

Draw a free body diagram of a piston, connecting rod and crank shaft. Indicate on the diagram the effective forces acting on the piston and the crank shaft during the expansion stroke. Now let’s do some sample calculations assume 2500 RPM and neglecting friction.

b. For a compression ignition engine with a 200mm bore, a compression ratio of rc = 20, and a cylinder pressure of 100 bar when the crank shaft is at θ = 0°, 45° and 90°. You can assume that the S/B = 1 and l/a = 3, that the piston has a mass of 1 kg, and for simplicity that the expansion of the hot gas from TDC to BDC is isentropic with k =1.4

Second sentence.

Expert Solution

Please refer to the attached images where I have shown FBD of forces acting on piston and crank marked by numbers 1 and 2. Piston Inertia force is subtracted because during expansion it is in opposite direction of gas force.

The frictional force has been neglected while calculating the problem. Do comment in case of any query, good luck!!

samet mamat answered 4 hours ago

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