Engineering, 18.04.2021 18:30, CurlyheadShay
A turbofan engine is being designed for a bypass ratio of 6:1. During cruise (M=0.85) at 12,000 km, the ratio of the exit stagnation pressure to ambient pressure po/p„ is 1.6:1 (the same for the fan as for the core engine). The stagnation temperature at exit from the core engine is 600 K; at exit from the fan it is only 340 K. The question is whether: a. The fan and core streams should expand in separate nozzles to ambient pressure, or b. They should first be mixed to uniform stagnation temperature, then expanded in a single nozzle. Determine the rats of thrusts (case a to case b) on the understanding that mixing of the two streams can be done with no loss in stagnation pressure. For simplicity, assume that the specific heat ratio and the gas constant are the same for both streams and that y = 1.4 and R = 0.287 The fuel-air ratio for the core engine is approximately 0.018, and nozzle losses are negligible.
Answers: 3
Engineering, 04.07.2019 18:10, settasav9641
Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.
Answers: 3
Engineering, 04.07.2019 18:10, samanthabutryn
Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan
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Engineering, 04.07.2019 18:20, DroctorWellsfan
Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above
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Engineering, 04.07.2019 18:20, kendrawalraven
The characteristic roots of a dynamic system are: 1.7920 1.8160 i, -1.7920 1.8160 i, -0.4160 what is the order of this system? what are the settling time and damping ratio of the system?
Answers: 3
A turbofan engine is being designed for a bypass ratio of 6:1. During cruise (M=0.85) at 12,000 km,...
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