1.  What is a wind tunnel?

2.  Explain the different parts of a wind tunnel.

3.  What are the various type of wind tunnel used for low and high speed testing of models?

4.  Define the term settling chamber of a wind tunnel.

5.  State and explain the following types of wind tunnel

• a)  Blower type wind tunnel b) Suction tunnels c) open jet tunnels

6.  Describe briefly the special problems of the supersonic tunnels.

7.  Explain with neat diagram the working of a closed circuit continuous supersonic nozzle.

8.  Why is a high molecular weight gas sometimes preferred for high Mach number tests?

9.  What are special advantages of shock tube and gun tunnel over the other types supersonic tunnels?

10.  Draw neat diagrams for the following wind tunnels

• a) Shock tube tunnel

b) Induction tunnel

11.  Explain the working of an open circuit continuous supersonic nozzle.

12.  Why is cooling of air is necessary in a closed circuit continuous supersonic nozzle.

SOLVED PROBLEMS

PROBLEM 1: Estimate the settling chamber pressure and temperature and the area ratio required to operate a Mach number 2.5 tunnel under standard sea–level conditions. Assume the flow to be one dimensional and the tunnel to be operating with correct expansion

SOLUTION: