Fox and McDonald's Introduction to Fluid Mechanics
9th Edition
ISBN: 9781118912652
Author: Philip J. Pritchard, John W. Mitchell
Publisher: WILEY
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Textbook Question
Chapter 12, Problem 7P
Air enters a turbine in steady flow at 0.5 kg/s with negligible velocity. Inlet conditions are 1300°C and 2.0 MPa absolute. The air is expanded through the turbine to atmospheric pressure. If the actual temperature and velocity at the turbine exit are 500°C and 200 m/s, determine the power produced by the turbine. Label state points on a Ts diagram for this process.
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A steam turbine is designed to operate at a mass flow of 1.5 kg / h. Entry state to the turbine P1=2 MPa, T1=400'C and V1=60m/s; the output state is P2=0.1MPa, x2 = 0.97 and V2=150m / s. The height difference between the turbine inlet and outlet is 1 m. The heat loss from the turbine is given as 50 kW.
a) Determine the power generated from the turbine.
b) Calculate the turbine power by neglecting the kinetic and potential energy changes. Comment these two results.
c) Calculate the turbine inlet and outlet cross-sectional areas, as well as the steam pipe diameters.
d) If the ambient temperature is 27'C, what is the entropy generation in the turbine?
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the pressure dropped to a set value, what would the resulting change in entropy of the system AS air (kJ/K)
be and what would the entropy change of the universe AS universe (kJ/K) be?
Assume:
m = 2 kg
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T₁ = 300 °C
P2 = 120 kPa
Tsurroundings = 27 °℃
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the 12% of isentropic heat drop is lost in
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1.5
Chapter 12 Solutions
Fox and McDonald's Introduction to Fluid Mechanics
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