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Unformatted text preview: 650:460 Aerodynamics Homework Assignment No. 7 Prof. Doyle Knight Tel: 732 445 4464, Email: doyleknight@gmail.com Office hours: Tues and Thur, 4:30 pm  6:00 pm and by appointment Fall 2009 1 Problem 8.1 The test section of the wind tunnel of Example 8.6 has a square cross section that is 1.22 m x 1.22 m. a) What is the mass flow rate of air through the test section for the flow conditions of the example ( i.e. , M = 3 . 5, p = 7 . 231 10 3 Pa, and T = 90 . 18 K) ? b) What is the volume flow rate of air through the test section ? Solution The mass flow rate is m = U A . The cross sectional area A = (1 . 22) 2 m 2 = 1.4884 m 2 . The density is obtained from the ideal gas equation = p RT = 7 . 231 10 3 (287)(90 . 18) = 0 . 2794 kg/m 3 2 Problem 8.1 The velocity is obtained from U = M a = M radicalbig RT = (3 . 5) radicalbig (1 . 4)(287)(90 . 18) = 666 . 24 m/s The mass flow rate is m = U A = (0 . 2794)(666...
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This note was uploaded on 12/15/2009 for the course 650 460 taught by Professor Knight during the Spring '09 term at Rutgers.
 Spring '09
 Knight

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