ME300Lecture39

ME300Lecture39 - Lecture 39: Air Standard Cycles Air...

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39.1 Lecture 39: Air Standard Cycles Air standard cycles are idealized cycles based on the following approximations: » The working fluid is ideal gas air » The combustion process is replaced by heat input from an external source » The heat rejection is used to restore the fluid to the initial state
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39.2 Continue Air Standard Cycles Cycles under consideration: » Carnot cycle – maximum cycle efficiency » Otto cycle – spark-ignition engine (SI engine) » Diesel cycle – compression-ignition engine (CI engine) » Dual cycle – modern CI engine » Brayton cycle – gas turbines » Other cycles that we do not analyze: – Stirling cycle – Ericsson cycle
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39.3 Carnot Heat Engine 1 2 3 4 S T Q H = T S 23 Q L = T S 14 W net W net
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39.4 Continue Air Standard Carnot Cycle How to make isothermal heat transfer - T = constants For an ideal gas, p v = constant! v p 1 2 3 4 p 3 p 2 p 4 p 1 T L = const. v 2 v 1 v 3 v 4 T H = const.
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ME300Lecture39 - Lecture 39: Air Standard Cycles Air...

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