Explain gas turbines?Β
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A regenerative gas turbine power plant isshown in Fig. P1. Air enters the compressor at 1bar, 27ΒΊC with a mass flow rate of 0.562 kg/s andis compressed to 4 bar. The isentropic efficiency ofthe compressor is 80%, and the regeneratoreffectiveness is 90%. All the power developed bythe high-pressure turbine is used to run thecompressor. The low-pressure turbine provides thenet power output. Each turbine has an isentropicefficiency of 87% and the temperature at the inletto the high-pressure turbine is 1200 K. Sketch thecorresponding T β s diagram and determine: (a) The net power output, in kW. (b) The thermalefficiency. (c) The temperature of the air at states2, 3, 5, 6, and 7, in K.Β
A turboprop engine consists of a diffuser,compressor, combustor, turbine, and nozzle. Theturbine drives a propeller as well as thecompressor. Air enters the diffuser with avolumetric flow rate of 83.7 m3/s at 40 kPa, 240 K,and a velocity of 180 m/s, and deceleratesessentially to zero velocity. The compressorpressure ratio is 10 and the compressor has anisentropic efficiency of 85%. The turbine inlettemperature is 1140 K, and its isentropic efficiencyis 85%. The turbine exit pressure is 50 kPa. Flowthrough the diffuser and nozzle is isentropic. Usingan air-standard analysis, determine: (a) the powerdelivered to the propeller, in MW. (b) the velocity atthe nozzle exit, in m/s. Neglect kinetic energyexcept at the diffuser inlet and the nozzle exit
In the figure shown below there are 125 ft of 2 -in pipe, 75ft of 6 -in pipe, and 150 \mathrm{ft} of 3 -in pipe, all cast iron. There are two 90 elbows and an open globe valve, all flanged. If the exit elevation is zero and the elevation at A is 100 ft, what horsepower is extracted by the turbine when the flow rate is 0.16 of water at ? For water at , take and slug/ft.s. For cast iron, . For Re=113500,37800, and 75600 , take f 0.0314,0.0266, and 0.0287 respectively.