Discussion
Effect of exit velocity on downwash and plume rise at a wind speed of 9 m/s.
| Exit velocity (m/s) | Ratio to wind speed | Downwash risk | Momentum rise |
|---|---|---|---|
| 6 | 0.67 | Severe | Very small |
| 9 | 1.00 | Likely | Small |
| 13.5 | 1.50 | Acceptable | Moderate |
| 20 | 2.22 | None | Good |
What minimum exit velocity should be specified for this site?
Answer: A
Correct answer: 13.5 m/s
The table shows the risk falling as the ratio rises, and it becomes acceptable at a ratio of 1.5 - that is \(1.5 \times 9 = 13.5\) m/s. Anything lower invites downwash; 20 m/s would be safer still but costs fan power for a benefit already obtained.
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