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Max. Marks: 100

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Pages: 2

Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh semester B.Tech examinations (S), September 2020

Course Code: AO409
Course Name: WIND TUNNEL TECHNIQUES

PARTA
Answer any three full questions, each carries 10 marks.

A partially sub-merged body is towed in water. The resistance R to its motion
depends on the density 0, the viscosityp of water, length | of the body, velocity
v of the body and the acceleration due to gravity g. Express the functional
relationship between these variables and the resistance to motion.

Explain the importance of dimensionless number in aerodynamics.

Define the importance of model analysis.

Explain open and closed-circuit wind tunnel with neat diagram also write its
advantage and disadvantages.

Show the variation of diffuser efficiency with diffuser angle.

Explain the components of supersonic wind tunnel in detail.

PART 8
Answer any three full questions, each carries 10 marks.

Explain how the velocity calibration done in subsonic wind tunnel test section.
Define horizontal buoyancy?
Explain yaw sphere and turbulence sphere in detail.
What are the parameters are considered while calibrating subsonic and
supersonic wind tunnel?
Write in detail about principle and working of Laser Doppler Anemometer,
How LDA principle is used to measure velocity of flow in a wind tunnel?
Write in detail about principle and working of hot wire anemometry with neat
diagram.
PART C

Answer any four full questions, each carries 10 marks.

Explain the performance of shock tube tunnel in detail with diagram.

Why are the wall static pressure holes very small?

Page lof 2

Duration: 3 Hours

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