Air enters the compressor of an air-standard Brayton cycle at 100kPa, 300K, with

Question

Air enters the compressor of an air-standard Brayton cycle at 100kPa, 300K, with a

volumetric flow rate of 5m3/s. The turbine inlet temperature is 1400K. The compressor

and Turbine both have isentropic efficiencies of 88%. For pressure ratios of

6,7,8,9,10,11 and 12, tabulate and then graph the following on the same graph using the

cold-air standard assumption and briefly discuss the effect of pressure ratio on the

following parameters:

a) Thermal efficiency versus pressure ratio

b) Back work ratio versus pressure ratio

c) Net power developed in kW versus pressure ratio

Show all calculations for a pressure ratio of 6 %u2013 the rest of your calculations can be done by hand, in excel or another program if you like

(Tip: create the graph with two ordinates, put the back-work ratio and thermal efficiency on one ordinate and the net power on the second ordinate %u2013 adjust the ordinate scales so you can clearly see the trend of each data set %u2013 be sure to label all axis and include a legend. The graph must be done with a computer; hand drawn graphs will not be accepted and will result in zero points for this section)

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