SpecialProblems17-19 - nozzle at a temperature of 1600 ° F...

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Special Problems for ME 200 – Fall 2009 Special Problems 17, 18, and 19 Due Friday, October 9, 2009 SP17: An ideal gas flows through a device at steady state such that its velocity increases from 5 m/s to 300 m/s without heat transfer or work. The temperature of the gas at the inlet is 20 ° C. The specific heat of the gas follows the relationship given as: C p = 1 + 0.01 T , where C p is in kJ/kg-K and T is in K. (a) What is the change in enthalpy (kJ/kg) of the gas? (b) Determine the temperature ( ° C) of the gas at the exit. SP18: After expanding through the turbine of a jet engine, the products of combustion enter a
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Unformatted text preview: nozzle at a temperature of 1600 ° F with negligible velocity. The products exit the nozzle at 700 ° F. Assume that the properties of combustion products are those of air. What is the maximum velocity (ft/s) at the nozzle exit? SP19: Steam enters a turbine at 10 MPa and 500 ° C with a mass flow rate of 38.7 kg/s. Part of the steam is extracted from the turbine after partial expansion at three different locations as shown below. The extracted steam is used in various heat exchangers. Wet steam having 88% quality exits the turbine at 10 kPa. Determine the power (MW) developed by the turbine....
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