HW4b_09 solution

HW4b_09 solution - ME 18b, HW 4 Due Tuesday April 28, 2008...

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1 ME 18b, HW 4 Due Tuesday April 28, 2008 (accepted until 4 pm) TAs for HW #4: Xaiobai Li, Friday and Monday 3-4 pm, Tom 212E; Julianne Gould, Sunday 4-6 pm, SFL 218 1. Research the Brayton Cycle: Obviously the Brayton cycle is named after the person who invented it, yet your textbook doesn’t even mention this person’s first name! Do a little research on your own about the Brayton cycle, briefly describe how it works, who invented it and tell a little bit of information about this inventor. Try to put your write up in your own words rather than cutting and pasting from the internet. 2. Brayton Cycle based on Cold Air Standard: Make plots of the specific heat transfer (into the cycle), efficiency and the specific work output for a Brayton cycle using cold air properties for a compression ratio ranging from 5 to 20. Assume the air inlet conditions are 290 K and 100 kPa and the turbine inlet temperature is 1600 K. Comment on the conclusions you observe in your plots. You may use a spreadsheet for this problem. Solution: The plot below shows the compressor outlet temperature T2, efficiency of the cycle and the net work from the cycle for a pressure ratio from 5 to 20
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2 The following plot shows the same results except for the heat input is shown with the cycle
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This note was uploaded on 01/08/2011 for the course ME 18b taught by Professor Hunt during the Spring '08 term at Caltech.

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HW4b_09 solution - ME 18b, HW 4 Due Tuesday April 28, 2008...

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