Discussion
Consider the following statements about downwash:
1. Stack tip downwash follows from low exit velocity relative to wind speed.
2. Building downwash follows from the wake cavity around a structure.
3. Both are prevented by increasing the emission rate.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 correctly describe the two mechanisms. Statement 3 is nonsense: the emission rate has no bearing on downwash, which is an aerodynamic effect - and raising it would simply increase the concentration that the downwash then brings to the ground.
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