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exam2_solutions

# exam2_solutions - ES330 S ection 2 N ame Midterm E xam 2...

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11111110 ES330 Section 2 Midterm Exam #2 Name: You will have 1.25 hours to complete the exam. Please show all work and list any assumptions that you are making in the solution. You must draw a control volume, free body diagram, and coordinate system if required by the problem to receive credit for your work. 1. (35 points total) The power, P (Nm/s), of a wind turbine is dependent on the rotor radius, r (m), the blade rotational speed Ct.) (rad/s), the wind speed V (mls), and the fluid properties p (Ns2/m4) and !l (Ns/m\ Note for air: p=1.2 (Ns2/m4) and !l=1.789x 10- 5 (Ns/m2) (a) (15 points) Find the non-dimensional groups for this problem. Use r, V, and p as the repeating variables. (b) (10 A wind turbine has a radius of 2 m. The rotational speed is 20 rpm for a wind speed of 5 mls. If the wind turbine is tested in at a 1110 scale in a wind tunnel what is the flow speed needed for the test? (c) (5 What is the rotational speed of the blades for the model wind turbine?

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exam2_solutions - ES330 S ection 2 N ame Midterm E xam 2...

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