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Question: 25 pts in an internal combustion engine the ignition compression...

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(25 pts) In an internal combustion engine, the ignition compression ratio (r), or the ratio volumes in an expansion or compression step, is an important for calculating efficiency. An Otto Engine cycle consists of (see diagram to right): an adiabatic compression . step (1-2), a constant volume heating step (2-3). an adiabatic expansion step (3-4), and a constant volume cooling step (4-1). Based on this information, show: power stroke adiabaticexpansion Qadd compression stroke adiabatic compressio 4 Qout intake stroke exhaust stroke 1 Volume T4-T1 T3-T2 Efficiency η-1-(r)-0-1), 1 where r is the compression ratio and Y-Cp/Cv C. (Hint: what do you know about state changes in adiabatic processes?)

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