METEO 300 Lecture Notes - Lecture 33: Propulsive Efficiency, Combustor, Conservation Of Mass
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Me 300 - lecture 33 - ideal gas cycles continued. 1-2: diffuser slows air velocity, increases pressure. 3-4: combustor injects heat and combusts fuel. *a turbojet engine cannot really go back to its initial state, so for the purposes of problem-solving, we create an imaginary situation in which this cycle exists by making state 1 and state 6 have the same pressure. Fuel to air ratio: = 1, range is approximately 150 to 1100. Propulsive efficiency: thrust power over the heat added. *force moves relative to ambient air at 1. Consider a turbojet-powered aircraft flying 200 m/s at 6000 m altitude (t=250 k; The pressure ratio of the compressor is 6 and the turbine inlet temperature is. 970 k. the fuel flow rate is 0. 68 kg/s and the overall air/fuel ratio is 75:1. Employ an air- standard-cycle analysis with the following cp and values of specific heats ratio:
