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1. An engine using a polyatomic (atoms not in a row) ideal gas is driven by this cycle: from A to B, the pressure increase to 3 times its original pressure while keeping V constant; from B to C, it expands adiabatically until it reaches 4 times the original volume; from C to D, the pressure drops at constant V; from D to A it contracts adiabatically.
(a) Sketch the cycle, indicating P, V, and T, for all points.
(b) What is the efficiency of this cycle?
(c) What's the maximum efficiency possible between the high and low temperatures. (Leave all answers in terms of the original P, V, and T.)
The figure on the right shows an approximated pressure distribution on an airfoil and the direction of incoming flow. Alpha is 10 degrees, the pressure distribution on the top is 3n/m and on the bottom is 1n/m. The chord Length is 1 meter.
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