“The highest compression ratio that can be used in an S.I. engine is limited by the
detonation characteristics of the available fuel”. Justify the statement.
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What is the significance of the critical pressure ratio for the nozzle of a steam turbine?
Obtain analytically its value in terms of the index of expansion.
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Compression ratios usually range from 8:1 to 10:1. A higher compression ratio -- say, from 12:1 to 14:1 -- means higher combustion efficiency. Higher compression ratios and combustion efficiency mean more power with less fuel, and fewer exhaust gases.
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