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NASA Guide to Engines

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NASA Guide to Engines ( nasa-guide-engines )

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PROBLEMS 1. Diesel engines run at high compression. A 12-cylinder marine diesel has a total displacement of 139.7 L and a compression ratio of 25:1. What is the highest pressure reached in one of the cylinders if the atmospheric pressure is 745 mm Hg? 2. In a model airplane one-cylinder engine the bottom dead center volume of the cylinder is 0.90 in3. If the atmo- spheric pressure is 775 mm at bottom dead center, and if the pressure at top dead center is 7926 mm, what is the volume of the gas at top dead center? 3. A turbojet engine has 900 ft3 of air enter the compressor and leave at a volume of 35 ft3 and a pressure of 28.8 atmospheres (atm). What would the atmospheric, or “free stream,” pressure be? 4. While an airliner is waiting at a terminal at the airport, a small auxiliary turbine engine is used to provide power for airconditioning and so forth. If the outside air pressure is 740. mm and the turbine engine has a compres- sor ratio of 8.5:1, what volume of air would need to be drawn into the engine to have 1.00 ft3 of air in the combustor? 30 Boyle’s Law

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