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Wind Tunnel

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Published in: Physics
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Introduction to Aeronautics A wind tunnel is a tool used in aerodynamic research to study the effects of air moving past solid objects. A wind tunnel consists of a tubular passage with the object under test mounted in the middle

Gaurav / Kota

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Qualification: B.Tech.

Teaches: Mathematics, Physics

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  1. What is wind tunnel ? ' A wind tunnel is a tool used in aerodynamic research to study the effects of air moving past solid objects. A wind tunnel consists of a tubular passage with the object under test mounted in the middle. NASA wind tunnel with a model of a plane
  2. The Anatomy of Wind Tunnel Contraction Section Test Section al fan Diffuser (Direction of Æ Flow) Settling Chanber ("Flow Straightener") In Test section, various quantities are measured like aerodynamic forces, pressure distribution on the test model.
  3. History of wind tunnel ' English military engineer and mathematician Benjamin Robins (1707—1751) invented a whirling arm apparatus to determine drag and did some of the first experiments in aviation theory. Francis Herbert Wenham (1824—1908), a Council Member of the Aeronautical Society of Great Britain, addressed these issues by inventing, designing and operating the first enclosed wind tunnel in 1871. The Wright brothers' use of a simple wind tunnel in 1901 to study the effects of airflow over various shapes while developing their Wright Flyer was in some ways revolutionary. Side View Shop Belt Drive Flow Direction View Window Fan Test Section Fan Straightener A 1901 wind tunnel (Wright brothers)
  4. World war two ' In 1941 the US constructed one of the largest wind tunnels at that time at Wright Field in Dayton, Ohio. ' By the end of World War Two, the US had built eight new wind tunnels, including the largest one in the world at Moffett Field near Sunnyvale, California . ' The worlds largest wind tunnel was constructed in AMES research centre of NASA
  5. World's largest wind tunnel 03/15/2008 AMES research centre at NASA
  6. Uses of wind tunnel ' Pressure distribution over a test model ' Air velocity through a test model ' Static pressure and dynamic pressure over a test model The direction of air flow across a test model ' Temperature rise across a test model ' Various aerodynamic forces across a test section
  7. Working of wind tunnel I nta ke Test Section Balance Compressor Fan Exhaust
  8. TYPES OF WIND TUNNEL
  9. LOW SPEED WIND TUNNEL HIGH SPEED WIND TUNNEL TRANSSONIC WIND TUNNEL SUPERSONIC WIND TUNNEL HYPERSONIC WIND TUNNEL
  10. LOW SPEED WIND TUNNEL LOW SPEED WIND TUNNEL ARE USED FOR OPERATIONS FOR VERY LOW MACH NUMBER. MACH NO. IS UPTO .4 Honeycomb Flov„.T Straightener Anti-Turbulence Screens Diffuser Silence Fan Test Section Inlet 60 ft
  11. HIGH SPEED WIND TUNNEL HIGH SPEED WIND TUNNELS ARE USED FOR MACH NO. .75 FROM .4 TO
  12. TRANSSONIC WIND TUNNEL TRANSSONIC WIND TUNNEL ARE USED FOR MACH NUMBER .75 TOI.2. -76 @ ETW
  13. SUPERSONIC WIND TUNNEL A SUPERSONIC WIND TUNNEL IS USED FOR MACH NUMBER 1.2 TO 5. IT NEEDS A LARGE POWER DEMAND. POWER IS OF THE ORDER OF 50MW PER SQUARE METER OF TEST SECTION CROSS SECTIONAL AREA.
  14. A Super- sonic wind tunnel
  15. HYPERSONIC WIND TUNNEL IN THIS TYPE OF WIND TUNNEL MACH NO. VARIES FROM 5 TO 15. ONE FORM OF HYPERSONIC WIND TUNNEL IS HOT SHOT OR GUN TUNNEL WHICH HAS MACH NO. UPTO 27. GUN TUNNEL IS USED FOR ANALYSIS OF FLOW PAST MISSILES, HEAT TRANFER AT HIGH TEMPERATURES.
  16. Hyper- Sonic wind tunnel
  17. Bellmouth Wind enters through this section. Constitutes aluminium honey comb structures. Acts as flow straightener. Constrict flow and increases air speed. Largest part of wind tunnel
  18. Test section Parallel sides — allow boundary layer growth. Four tapered fillets -compensate for the narrowing of the flow channel due to boundary layer growth To provide a constant static pressure throughout the test section. Camera and other measuring equipment
  19. Diffuser And Fan Gradually expanding passage- low speed decreases and the pressure rises. Aluminium blade fan Sucks air inside wind tunnel.

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