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# hw_7 - 2.9 21.24 1.0 32.27 3.0 20.49 1.5 31.22 3.1 19.6 2.0...

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Homework set #7 MMAE 310: Spring 2007 1) A steam turbine receives superheated steam at 1.4 MPa absolute and 400 degrees C. The steam leaves the turbine at atmospheric pressure and 100 degrees C. The steam enters the turbine at 15 m/s and exits at 60 m/s. The elevation difference between the entrance and exit is negligible. The heat lost through the turbine walls is 7600 kJ/hour. a) Calculate the power output if the mass flow through the turbine is 0.5 kg/s. 2) The following data were taken for turbulent flow in a circular pipe with a radius of 3.5 cm. The table gives the velocity values as a function of the radius. The velocity at the surface of the pipe is zero. a) Estimate the kinetic energy correction factor. r (cm) V (m/s) r (cm) V (m/s) 0.0 32.5 2.8 22.03 0.5 32.44

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Unformatted text preview: 2.9 21.24 1.0 32.27 3.0 20.49 1.5 31.22 3.1 19.6 2.0 28.21 3.2 18.69 2.25 26.51 3.25 18.16 2.5 24.38 3.3 17.54 2.6 23.7 3.35 17.02 2.7 22.88 3.4 16.14 3) Gasoline having a specific gravity of 0.8 is flowing in the pipe shown at a rate of 6 cfs. The area at section 1 is 0.80 ft 2 and the area at section 2 is 0.20 ft 2 . a) What is the pressure at section 2 when the pressure at section 1 is 10 psig and the head loss if 4 ft between the two sections? 4) The small boat is driven at a steady speed V o by a jet of compressed air issuing from a 3-cm-diameter hole at V e = 343 m/s. Jet exit conditions can be assumed to be P e = 1atm and T e = 30 ° C. The hull drag is k V o 2 where k = 19 N-s 2 /m 2 . a) Estimate the boat speed V o in m/s. gasoline g 1 12 ft 2...
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hw_7 - 2.9 21.24 1.0 32.27 3.0 20.49 1.5 31.22 3.1 19.6 2.0...

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