Experimental investigation of wind tunnel performance due to the blockage of models within the test chamber

Author

Associate professor, Department of Mechanical Engineering, Iranian research organization for science and technology

Abstract

 One of the aims of using vertical wind tunnel is skydiving. Since the persons are floating in the flight chamber of wind tunnel, the blockage of them will be affect on the performance of wind tunnel. So for designing of this type of wind tunnel, pressure drop due to the floating persons is important. In this experimental study, using a cylindrical model, the blockage effects have been investigated. When the blockage ratio in the test section is less than 0.15, flow rate reduce about 7% and there is no important effect on the performance of wind tunnel. With increasing blockage ratio in the test section up to 0.2, reducing the flow rate is very high. Also, the arrangement of models in the test section is very important on the pressure drop that we will discuss in this paper.

Keywords

References

[1] Gorlin, S. M., and Slezinger, I. I., “Wind Tunnel and Their Instrumentations”, Israel Program for Scientific Tranlations, Jerusalem, U.S. Department of Commerce. Clearinghouse for Federal Scientific and Technical Information Springfield, (1966).
 
[2] Wieghardt, K. E. G., “On the Resistance of Screens”, Aeron. Quart, Vol. 4, pp 186-192. (1953).
 
]3[ اردکانی، م. ع. "تونل باد با سرعت پایین (اصول طراحی وکاربرد)"، انتشارات دانشگاه صنعتی خواجه نصیرالدین طوسی، (1388).
 
[4] Barlow, J. B., Rae, W. H., and Pope, A., “Low Speed Wind Tunnel Testing”, A Wiley-Intersience Publication, John Wiley and Sons, Inc, New York, (1999).
 
[5] Rae, W. H., and Pope, A., “Low Speed Wind Tunnel Testing”, 2nd Edition, A Wiley-Intersience Publication, John Wiley and Sons, Inc, New York, (1984).
Iranian Journal of Mechanical Engineering Transactions of ISME
Volume 14, Issue 4 - Serial Number 29
Fluid Mechanics and Heat Transfer
March 2012
Pages 118-130

Files

History

  • Receive Date: 12 October 2012
  • Accept Date: 12 October 2012

Share

How to cite

Statistics