Problem 5. Air flows at a velocity of U = 20 m/s over a flat bottomed, two-dimensional object with a chord length of c = 1.0 m and wing span of 6 = 5.0 m as shown. The shape of the object, y = f(x), and the pressure distribution. p = g(x), measured in a wind tunnel with air at STP along the top surface are given in the table. (a) Calculate and plot the pressure coefficient, C, versus * for the top of the object. (b) Calculate the lift coefficient, Cr, using the calculated Co. (c) Calculate the lift for the object for these conditions and at a standard cruising altitude of 10 km (assuming constant C₂). U Poo I ** = x/c y* = y/c p-Pro (Pa) 0.000 0.0000 245 0.025 0.0372 14 0.050 0.0530 -127 0.075 0.0648 -152 0.100 0.0743 -151 0.200 0.0992 -154 0.300 0.1114 -166 0.400 0.1149 -174 0.500 0.1045 -174 0.600 0.0911 -105 0.700 0.0646 -33 0.800 0.0362 26 0.900 0.0126 65 1.000 0.0000 85

Elements Of Electromagnetics
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Problem 5. Air flows at a velocity of U = 20 m/s over a flat bottomed, two-dimensional object with a chord
length of c = 1.0 m and wing span of 6 = 5.0 m as shown. The shape of the object, y = f(x), and the
pressure distribution. p = g(x), measured in a wind tunnel with air at STP along the top surface are given in the
table. (a) Calculate and plot the pressure coefficient, C, versus * for the top of the object. (b) Calculate the lift
coefficient, Cr, using the calculated Co. (c) Calculate the lift for the object for these conditions and at a standard
cruising altitude of 10 km (assuming constant C₂).
U
Poo
I
** = x/c
y* = y/c
p-Pro (Pa)
0.000
0.0000
245
0.025
0.0372
14
0.050
0.0530
-127
0.075
0.0648
-152
0.100
0.0743
-151
0.200
0.0992
-154
0.300
0.1114
-166
0.400
0.1149
-174
0.500
0.1045
-174
0.600
0.0911
-105
0.700
0.0646
-33
0.800
0.0362
26
0.900
0.0126
65
1.000
0.0000
85
Transcribed Image Text:Problem 5. Air flows at a velocity of U = 20 m/s over a flat bottomed, two-dimensional object with a chord length of c = 1.0 m and wing span of 6 = 5.0 m as shown. The shape of the object, y = f(x), and the pressure distribution. p = g(x), measured in a wind tunnel with air at STP along the top surface are given in the table. (a) Calculate and plot the pressure coefficient, C, versus * for the top of the object. (b) Calculate the lift coefficient, Cr, using the calculated Co. (c) Calculate the lift for the object for these conditions and at a standard cruising altitude of 10 km (assuming constant C₂). U Poo I ** = x/c y* = y/c p-Pro (Pa) 0.000 0.0000 245 0.025 0.0372 14 0.050 0.0530 -127 0.075 0.0648 -152 0.100 0.0743 -151 0.200 0.0992 -154 0.300 0.1114 -166 0.400 0.1149 -174 0.500 0.1045 -174 0.600 0.0911 -105 0.700 0.0646 -33 0.800 0.0362 26 0.900 0.0126 65 1.000 0.0000 85
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