An SI engine operating at WOT on a four-stroke air-standard cycle has cylinder conditions at the start of compression of 100F and 14.7 psia. Compression ratio is rc = 10, and the heat added during combustion is qin = 800 BTU/lbm. During compression the temperature range is such that a value for the ratio of specific heats k = 1.4 would be correct. During the power stroke the temperature range is such that a value of k = 1.3 would be correct. Use these values for compression and expansion, respectively, when analyzing the cycle. Use a value for specific heat of Cv= 0.216 BTU/lbm-R, which best corresponds to the temperature range during combustion. Calculate: %3D %3D (a) Temperature at all states in cycle. [OF] (b) Pressure at all states in cycle. [psia] (c) Average value of k which would give the same indicated thermal efficiency value as the analysis in parts (a) and (b).

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IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.