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100S11_PS2

# 100S11_PS2 - ENES 100 Introduction to Engineering Design...

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ENES 100 Introduction to Engineering Design Spring 2011 1/3 Problem Set #2 Assigned: Feb. 4, 2011 Due: In class on Feb. 14 (M) or Feb. 15 (Tu) Reading: Chapter 3: Fluid Mechanics and Design Analysis Chapter 7: Computer Aided Design (CAD) Assume the air density to be =1.2 kg/m 3 , and the acceleration of gravity g=9.8 m/s 2 for all problems. Show all calculations where necessary. To receive full credit, you must show and explain your calculations. Problems: 1. For this problem, you are tasked with performing a study showing the effects of hover height and power on the selection of your levitation fan. Note: Microsoft Excel can be used for this assignment (recommended), please pay close attention to significant figures, round up or down as necessary . (a) Consider a circular hovercraft 0.40 m in diameter with a mass of 2.5 kg set to levitate at 1.0mm, 2.0mm and 3.0mm hover heights. Calculate the p and Q that the levitation fan provides for this hovercraft for each hover height. Similarly to vehicle geometry and mass, hover height is also a design parameter. Discuss how the increase in hover height from 1 to 3 mm changes the p and Q requirement for your levitation fan. (b) Using the power equation P = pQ, calculate the power required to hover at 1.0, 2.0, and 3.0 mm hover heights.

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100S11_PS2 - ENES 100 Introduction to Engineering Design...

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