Reg No.:

100004 0409122001 Pages: 2

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

Max. Marks: 100

1 ஐ
b)
2 ஐ
b)
a)
4 ஐ
b)
5 a)
b)
6 a)
a)
8 a)

Course Code: 9
Course Name: WIND TUNNEL TECHNIQUES

PARTA

Answer any three full questions, each carries 10 marks
Restate Buckingham Pi theorem.
The resisting force R of a supersonic plane during flight can be considered as
dependent upon length of the aircraft 1, velocity ५, air viscosity பூ, air density 0,
and bulk modulus of air K. Using Buckingham’s pi theorem, express the
functional relationship between these variables and the resisting force.
Define similarity. Enumerate about different types of similarities with neat
sketch. Describe the scale effect of similarities.
Derive any five non-dimensional numbers which are mostly relevant for moving
fluids.
Explain about open and closed type wind tunnel.
Explain in detail about classification and types of wind tunnel.
Illustrate the schematic layout and essential features of the intermittent blow-
down wind tunnel.

PART 13

Answer any three full questions, each carries 10 marks
Derive the expression to determine the test section speed of the subsonic wind
tunnel.
What is flow angularity? What are the associated instruments to measure flow
angularity?
Describe the calibration procedure for subsonic wind tunnel.
Explain the concept of six component balance system for force and moment
calculations.
Write in detail about principle and working of hot wire anemometry with neat

diagram.

Page 1 of 2

Duration: 3 Hours

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