Physics, 25.10.2019 23:43 keshan3000
An ideal bypass turbojet (no losses in compressor, burner, turbine, nozzle, fan, and fan nozzle) has a bypass ratio 'lj! , of 8: 1 and a maximum turbine inlet temperature of 1200 k. at takeoff the ambient conditions are 298 k and 101 kpa. the bypass nozzle exhaust and core engine nozzle exhaust velocities are identical. what compressor pressure ratio will maximize takeoff thrust? for ease of calculation the approximation f < < 1 may be used (f being the fuel-air ratio for the core engine) and the specific heat ratio 'y may be taken to be 1.4 throughout.
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Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =
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An ideal bypass turbojet (no losses in compressor, burner, turbine, nozzle, fan, and fan nozzle) has...
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