- A Turbofan Jet Engine With Separate Exhaust Streams And Convergent Nozzles Is Sized For A Mass Flow Rate Of 200 Kg S At 1 (51.75 KiB) Viewed 27 times
A turbofan jet engine with separate exhaust streams and convergent nozzles is sized for a mass flow rate of 200 kg/s at 12km (standard day), Mach number of 0.9 and turbine inlet temperature of 1667 K. Given the following reference conditions: Cpc = 1.004 kJ/(kg. K) Cpt = 1.096 kJ/(kg. K) Ye = 1.4 hPR = 42800 kJ/kg a = 8.0 Yt = 1.33 πc = 36 π = 1.7 Tfn = 0.99 π = 0.96 TTH = 0.7580 π tL 0.2349 TtL = 0.7262 πn = 0.99 nf = 0.8815 ¹cH = 0.8512 1b = 0.99 mtL = 0.9068 ¹mH = 0.9915 ¹m² = 0.9970 Determine the performance of this engine at the same throttle settings but at different Mach numbers and altitudes as in the instructions for each of the following two cases: 1) The fan exit state is the same as the LPC exit state 2) The LPC exit state is defined as TCL = 2.35 and c = 0.8775. Instructions: a) Tabulate the results for each case at Mach number of 0.2, 0.4, 0.6, 0.8, 0.9, 1.2 and altitudes of 0, 5, 10, 12, 15 km. Each table will therefore contain 30 data points and include the parameters: mo, α, Пf, πcL, π cH, Tf, TCL,TCH, TtL, f, Mg, M19, F,S, (N) · (~), (NR) HPspool' ,np, nt. Fan b) Plot the variation of mo, α, F, S, If, πch with Mach number and altitude. c) Discuss your results Id max = 0.99 ПЕН = 0.2851