EML4304C HW4

# EML4304C HW4 - EML4304C Concept questions 1 What is the...

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EML4304C Concept questions 1. What is the more common term for an energy-producing turbomachine ? How about an energy-absorbing machine ? Explain this terminology. In particular, from which frame of reference are these terms defined – that of the fluid or that of the surroundings? 2. What are the primary differences between fans, blowers, and compressors? Discuss in terms of pressure rise and volume flow rate. 3. List at least two common examples of fans, of blowers, and of compressors. 4. Discuss the primary difference between a positive-displacement turbomachine and a dynamic turbomachine . Give an example of each for both pumps and turbines. 5. For a pump, discuss the difference between brake horsepower and water horsepower , and also define pump efficiency in terms of these quantities. 6. For a turbine, discuss the difference between brake horsepower and water horsepower , and also define turbine efficiency in terms of these quantities. 7. Explain why there is an “extra” term in the Bernoulli equation in a rotating reference frame. (If you are using the textbook by Fox and McDonald, you may need to borrow the textbook by Cengal and Cimbala to answer this question.) 8. A water pump increases the pressure of the water passing through it. The water is assumed to be incompressible. For each of the three cases listed below, how does average water speed change across the pump? In particular, is V out less than, equal to, or greater than V in ? Show your equations, and explain. (a) Outlet diameter is less than inlet diameter ( D out < D in ) (b) Outlet and inlet diameters are equal ( D out = D in ) (c) Outlet diameter is greater than inlet diameter ( D out > D in )

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9. An air compressor increases the pressure ( P out < P in ) and the density ( ρ out < ρ in ) of the air passing through it. For the case in which the outlet and inlet diameters are equal ( D out = D in ), how does the average air speed change across the compressor? In particular, is V out less than, equal to, or greater than V in ? Explain. 10.
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EML4304C HW4 - EML4304C Concept questions 1 What is the...

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