Register Number
SATHYABAMA UNIVERSITY
(Established under section 3 of UGC Act,1956)
Course & Branch :B.E - AERO
Title of the Paper :Wind Tunnel Techniques
Sub. Code :AEE08(2007-08)
Date :23/08/2012
Max. Marks:80
Time : 3 Hours
Session :FN
_______________________________________________________________________________________________________________________________
1.
PART - A
Answer ALL the Questions
Define Reynolds Number.
(10 x 2 = 20)
2.
What is the condition for two flows to be dynamically similar?
3.
What is continuity equation and momentum equation for
incompressible flows?
4.
Briefly discuss about Honeycombs in Wind tunnel.
5.
At a point in a test section dynamic pressure(q) and density()
are measured as 82.8 N/m2 and 1.15 kg/m3 respectively. Find out
local velocity at that point.
6.
Differentiate Wind axes and Body axes.
7.
What are the types of external balances?
8.
What is Three point mounting?
9.
What is meant by Pathline?
10. Discuss about “Liquid Crystals”.
PART – B
Answer ALL the Questions
(5 x 12 = 60)
11. Briefly discuss about various types of wind tunnels.
(or)
12. Using Buckingham’s -theorem, show that the velocity through
D  
,
 . Where HH

VH


a circular orifice is given byV  2 gH  
heading causing flow, D=diameter of the orifice, =co-efficient
of viscosity,  =mass density, and g-acceleration due to gravity.
13. Discuss about the general layout for closed return tunnel.
(or)
14. Explain “Wind tunnel component energy losses”.
15. Briefly explain the following
(a) Dynamic Pressure variation across Jet
(b) Flow angle variation across Jet
(or)
16. Discuss Test section Turbulence measurement.
17. Explain Concept of Six-Component Balance.
(or)
18. Explain in detail Calibration of Internal balance.
19. How is surface flow visualization done by using,
(a) Tufts
(b) Oil
(c) China Clay
(or)
20. Discuss methods of Smoke formation.