JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

UNIT - I

Aerodynamic Experiments - History, Model Testing & Wind Tunnels - Types, Application: Forms of aerodynamic experiments- observation, measurement- objectives. History means. Model testing- wind tunnel- principles - scaling laws, scale parameters- significance. Wind tunnels- low speed- types, description. High speed tunnels- transonic, supersonic, hypersonic, shock tubes, special tunnels- low turbulence, high Re, environmental, automobile- function, distinctive features, application. Major wind tunnel facilities- description, details.

UNIT - II

Low Speed Wind Tunnels - Construction, Components, Performance & Wind Tunnel Corrections: Low speed wind tunnel- principal components- working section, diffuser, corners, turning vanes, fan, straighteners, honeycombs, screens, contraction cone, fan, motor- function, description, design requirements, constraints, construction, performance- loss coefficients. Wind tunnel performance- flow quality, power losses. Wind tunnel corrections. Sources of inaccuracies- buoyancy, solid blockage, wake blockage, streamline curvature- causes, estimation, and correction. Total correction on airspeed, dynamic pressure, and zero lift drag.

UNIT - III

Load Measurements - Wind Tunnel Balances & Flow Measurements – Instrumentation: Load measurements - wind tunnel balances, types, description, application. Steady and unsteady pressure measurements and various types of pressure probes and transducers, errors in pressure measurements; measurement of temperature using thermocouples, resistance thermometers, temperature sensitive paints and liquid crystals; measurement of airspeed, flow direction, boundary layer profile using Pitot static tubes, 5 hole probes, total head rake- function, working principle, types, details of design and construction.

UNIT - IV

Flow Visualisation Techniques: Flow visualisation- need, types- tufts, china clay, oil film, smoke- working principle, description, setting up, operation, observation, recording, interpretation of imagery, relative merits, applications. High speed flows- optical methods- shadowgraphy, Schleiren, interferometry.

UNIT - V

Measurement of Velocity - Hotwire Anemometry, Laser Doppler Anemometry, Particle Image Velocimetry- Overview: Hot Wire Anemometry, Laser Doppler Anemometry,

R16 B.TECH AERONAUTICAL ENGG.

Particle Image Velocimetry- working principles, description of equipment, experimental setup, settings, calibration, measurement, data processing, applications.

TEXT BOOKS:

• 1. Low Speed Wind Tunnel Testing, Barlow, J.B., Rae, W.H., Pope, A., Wiley 1999.
• 2. High Speed Wind Tunnel Testing, Pope, A. and Goin, K.L., Wiley, 1965.
• 3. Yang, W.J., Handbook of Flow Visualization, 2nd edition, Taylor and Francis, 2001.

REFERENCES

• 1. 1. Bradshaw, P., Experimental Fluid Mechanics, Pergamon Press, 1970.
• 2. Goldstein, R.J., (Ed.) Fluid Mechanics Measurements, Taylor Francis, Washington 1996. 84.
• 3. Tropea, C., Yarin, A. L., Foss, J. F., Handbook of Experimental Fluid Mechanics, Springer, 2007 R16 B.TECH AERONAUTICAL ENGG.