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eml 3100 brayton cycle

eml 3100 brayton cycle - Thermodynamics The Brayton Cycle...

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1 Thermodynamics The Brayton Cycle Used to analyze gas turbines (where compression and expansion occur using rotating machinery) Gas Turbines usually operate as an open cycle Used in aircraft propulsion and electric power generation Exhaust propels craft or used to generate steam. http://travel.howstuffworks.com/turbine3.htm

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2 Thermodynamics Simple Ideal Brayton Cycle 1-2: isentropic compression 2-3: constant pressure heat addition 3-4: isentropic expansion 4-1: constant pressure heat rejection Modeled as a closed cycle. Cold Air standard assumptions are applied. Air is the working fluid.
3 Thermodynamics Model this as a closed system. No major changes in kinetic or potential energy. q in = h 3 – h 2 = C p (T 3 – T 2 ) -q out = h 1 – h 4 = C p (T 1 – T 4 ) Or q out = C p (T 4 – T 1 ) η th,Brayton = w net /q in Looking at the first law, in = out w net = q in – q out Therefore, η th,Brayton = w net /q in = (q in -q out )/q in η th,Brayton = 1 – T 1 (T 4 /T 1 -1)/T

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eml 3100 brayton cycle - Thermodynamics The Brayton Cycle...

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