During the power stroke in a four-stroke automobileengine, the piston is forced down as
Chapter 21, Problem 31(choose chapter or problem)
During the power stroke in a four-stroke automobileengine, the piston is forced down as the mixtureof combustion products and air undergoes an adiabaticexpansion. Assume (1) the engine is running at2 500 cycles/min; (2) the gauge pressure immediatelybefore the expansion is 20.0 atm; (3) the volumes of themixture immediately before and after the expansionare 50.0 cm3 and 400 cm3, respectively (Fig. P21.31);(4) the time interval for the expansion is one-fourththat of the total cycle; and (5) the mixture behaves likean ideal gas with specific heat ratio 1.40. Find the averagepower generated during the power stroke.
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