As a means of preventing ice formation on the wings of a small, private aircraft, it is proposed that electric resistance heatin
g elements be installed within the wings. To determine representative power requirements, consider nominal flight conditions for which the plane moves at 100 m/s in air that is at a temperature of -23 degree C. If the characteristic length of the airfoil is L = 2 m and wind tunnel measurements indicate an average friction coefficient of of C_f = 0.0025 for the nominal conditions, what is the average heat flux needed to maintain a surface temperature of T_s = 5 degree C?
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Answer
63 %
Explanation:
It is given that the reservoirs is at the temperature of 627°C and 27°C
So lower temperature that is = 60°C=273+60=333 K
And the higher temperature that is = 627°C =273+627=900 K
We know that the thermal efficiency of thermal reservoir = 1- =
= 0.63 =63 %
So the efficiency of the reservoir is 63%
Answer:
A) Rate of heat addition = 228.53 Hp
B) Maximum Air temperature = 1109 °C
Explanation:
We are given;
Cut off ratio; r_c = 1.5
Compression ratio; r = 18
Power produced; W` = 150 Hp
cp = 1.005 kJ/kg·K
cv = 0.718 kJ/kg·K
R = 0.287 kJ/kg·K
k = 1.4
Temperature;T1 = 17°C = 17 + 273 K = 290K
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