The compression ratio of an engine is the ratio of the maximum volume to the minimum volume of the cylinder as it goes through a cycle. Air enters the cylinder of an engine whose compression ratio is 9.5 while the cylinder is at its maximum volume. Initially, the air is at 40°C and 90 kPa. Compression occurs until the cylinder is at its minimum volume. Assuming that the compression is isentropic and that the air behaves as an ideal gas with constant specific heats, (a) determine the final temperature and pressure of the air after the compression process. (b) With the same assumptions, plot the final temperature and pressure for compression ratios ranging from 7 to 12. (c) If the air temperature cannot exceed 530°C, what is the maximum allowed compression ratio for the engine?
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