Discussion
Consider the following statements about the bounding characteristics of a centred fan:
1. The leading one lies at the upstream Mach angle to the upstream flow.
2. The trailing one lies at the downstream Mach angle to the downstream flow.
3. The two are parallel to each other.
Which of the statements given above is or are correct?
Answer: C
The first two correctly locate the two edges of the fan. The third is false: because the flow has accelerated, the downstream Mach angle is the smaller, so the characteristics diverge and the fan opens out. That divergence is what distinguishes an expansion from a compression.
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