Discussion
Match each cooling method in List I with its mechanism in List II.
List I
A. Convection cooling
B. Film cooling
C. Transpiration cooling
D. Thermal barrier coating
List II
1. Air through internal passages absorbing heat
2. Air ejected through holes to blanket the surface
3. Air seeping uniformly through a porous wall
4. A ceramic layer of very low conductivity
Select the correct match.
Answer: D
The first three all spend compressor air while the fourth spends none, which is why coatings were such a valuable addition. In practice the methods are combined, since none alone gives the margin a modern entry temperature demands.
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