In a spark-ignition engine, some cooling occurs as the gas

Chapter 9, Problem 941

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QUESTION:

In a spark-ignition engine, some cooling occurs as the gas is expanded. This may be modeled by using a polytropic process in lieu of the isentropic process. Determine if the polytropic exponent used in this model will be greater than or less than the isentropic exponent.

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QUESTION:

In a spark-ignition engine, some cooling occurs as the gas is expanded. This may be modeled by using a polytropic process in lieu of the isentropic process. Determine if the polytropic exponent used in this model will be greater than or less than the isentropic exponent.

ANSWER:

Step 1 of 4

It is to be determined if the polytropic exponent to be used in an Otto cycle model will be greater than or less than the isentropic exponent.Refer to the  diagram below.

Assumptions are

1. The air-standard assumptions are applicable.

2. Kinetic and potential energy changes are negligible.

3. Air is an ideal gas with constant specific heats.

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