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Question 1

Name 2 predestined applications of shock tubes.
1 Advantage and 1 Disadvantage with wind tunnels

Answer 1

Applications:
1. Simulation of capsule reentry into atmosphere
2. Supersonic aerodynamics

Advantage:
1. High Mach numbers possible.

Disadvantage:
1. Only small models fit into the tube.

Question 2

Explain (by using suitable graphs and/or equations) why the reduction of the backpressure pe at the exit of the nozzle increases the mass flow until M=1 is reached in the smallest crosssection. Why does a further reduction of the backpressure not lead to higher mass flows?

Answer 2

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