Problem 13.17 - 2.00 0.137 0.0622 44.4 2.50 0.172 0.0501 44.1 3.00 0.206 0.0421 43.7 4.00 0.274 0.0322 42.7 5.00 0.343 0.0264 41.5 6.00 0.412

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Problem 13.17 [Difficulty: 3] Given: Data on tank conditions; isentropic flow Find: Plot cross-section area and pressure distributions Solution: The given or available data is: R = 53.33 ft·lbf/lbm· o R k = 1.4 T 0 = 500 o R p 0 = 45 psia p e = 14.7 psia m rate = 2.25 lbm/s Equations and Computations: From p 0 , p e and Eq. 13.7a (using built-in function IsenMfromp (M,k)) (13.7a) M e = 1.37 Because the exit flow is supersonic, the passage must be a CD nozzle We need a scale for the area. From p 0 , T 0 , m flow , and Eq. 13.10c (13.10c) Then A t = A * = 0.0146 ft 2 For each M , and A *, and Eq. 13.7d (using built-in function IsenA ( M , k ) (13.7d) we can compute each area A . From each M , and p 0 , and Eq. 13.7a (using built-in function Isenp ( M , k ) we can compute each pressure p .
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L (ft) M A (ft 2 ) p (psia) 1.00 0.069 0.1234 44.9 1.25 0.086 0.0989 44.8 1.50 0.103 0.0826 44.7 1.75 0.120 0.0710 44.5
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Unformatted text preview: 2.00 0.137 0.0622 44.4 2.50 0.172 0.0501 44.1 3.00 0.206 0.0421 43.7 4.00 0.274 0.0322 42.7 5.00 0.343 0.0264 41.5 6.00 0.412 0.0227 40.0 7.00 0.480 0.0201 38.4 8.00 0.549 0.0183 36.7 9.00 0.618 0.0171 34.8 10.00 0.686 0.0161 32.8 11.00 0.755 0.0155 30.8 12.00 0.823 0.0150 28.8 13.00 0.892 0.0147 26.8 14.00 0.961 0.0146 24.9 14.6 1.000 0.0146 23.8 16.00 1.098 0.0147 21.1 17.00 1.166 0.0149 19.4 18.00 1.235 0.0152 17.7 19.00 1.304 0.0156 16.2 20.00 1.372 0.0161 14.7 Area Variation in Passage 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 5 10 15 20 L (ft) A (ft 2 ) Pressure Variation in Passage 5 10 15 20 25 30 35 40 45 50 2 4 6 8 10 12 14 16 18 20 L (ft) p (psia)...
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This note was uploaded on 01/20/2012 for the course EGN 3353C taught by Professor Lear during the Fall '07 term at University of Florida.

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Problem 13.17 - 2.00 0.137 0.0622 44.4 2.50 0.172 0.0501 44.1 3.00 0.206 0.0421 43.7 4.00 0.274 0.0322 42.7 5.00 0.343 0.0264 41.5 6.00 0.412

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