Question: In wind-tunnel testing near Mach 1, a small area decrease caused by model blockage can be important. Let the test section area be 1 sq.m.

In wind-tunnel testing near Mach 1, a small area decrease caused by model blockage can be important. Let the test section area be 1 sq.m. And unblocked conditions are Ma = 1.1 and T = 20°C. What model area will first cause the test section to choke? If the model cross-section is 0.004 sq.m what % changes in test-section velocity results?

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