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Essay2 - ME 5446 ESSAY 2 September 8 2008 In the analysis...

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ME 5446 ESSAY # 2 September 8, 2008 In the analysis of the combustion, it is important to identify whether the process occurs in the fixed-mass mode or in the flowing-fluid mode. An example of fixed-mass- mode combustion is the process that occurs in a cylinder of an internal combustion engine. The mass that is trapped between the piston and the cylinder walls remains constant during the processes of compression, chemical reaction, and expansion. The form of the First Law for this fixed-mass situation is: U = Q – W (1) An illustration of combustion in the flowing-fluid mode is the jet engine. Air entering the engine is compressed and is than mixed with a gaseous fuel, all in steady flow. The mixture is ignited and the flames are held in place by metallic structures called flame holders. The products of combustion flow through a nozzle situated at the downstream end of the jet engine. The nozzle accelerates the stream to very high velocities, and the jet streaming out of the exit creates a forward thrust which results from the reaction of the ambient air to the intrusion of the jet.
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