Engineering, 21.02.2020 05:30 Kpthegoat
The total pressures and temperatures of the gas are specified for a turbofan engine with separate exhaust streams (JT3D-3B from Pratt & Whitney, 1974). The mass flow rates in the engine core (or primary) and the engine fan are also specified for the sea level static operation. Calculate (a) the engine bypass ratio a defined as the ratio of fan-to-core flow rate (b) from the total temperature rise across the burner, estimate the fuel-to-air ratio and the fuel flow rate in lbm/h, assuming the fuel heating value is QR ~ 18,600 BTU/ Ibm and the specific heat at con- stant pressure is 0.24 and 0.26 BTU/Ibm - 'R at the entrance and exit of the burner, respectively (c) the engine static thrust based on the exhaust veloc- ities and the mass flow rates assuming perfectly expanded nozzles and compare your answer to the specified thrust of 18,000 lbs (d) the engine thermal efficiency
Answers: 2
Engineering, 03.07.2019 15:10
Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.
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Engineering, 04.07.2019 18:10
Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.
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Engineering, 04.07.2019 18:10
Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200ยฐc and outer surface temperature of the insulation to be 15ยฐc. calculate the thickness of insulation required.
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Engineering, 04.07.2019 19:10
When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?
Answers: 2
The total pressures and temperatures of the gas are specified for a turbofan engine with separate ex...
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