Explain transpiration cooling. What is film cooling?

A.      Explain transpiration cooling. What is film cooling?

B.      What do you understand by ablative cooling? What are its applications?

C.      What is ablative velocity? What is heat of ablation?

 

D.      A thermocouple 0.063 cm in diameter is held normal to an air stream, and at M = 0.7, it reads 60°C. If the recovery factor is 0.9, find the static temperature of the air. 9.4 Air at 1/20 atm and 275 K flows with a free stream velocity of 700 m/s over a flat plate 1.2 m long. If the surface of the plate is to be maintained at 325 K, determine the amount of cooling needed per metre width of the plate.

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