Control of Pressure Gradient in the Contraction of a Wind Tunnel
Subsonic wind tunnel experiments were conducted to
study the effect of tripped boundary layer on the pressure distribution
in the contraction region of the tunnel. Measurements were
performed by installing trip strip at two different positions in the
concave portion of the contraction. The results show that installation
of the trip strips, have significant effects on both turbulence and
pressure distribution. The reduction in the free stream turbulence and
reduction of the wall static pressure distribution deferred signified
with the location of the trip strip.
[1] F. Fang, J. C. Chen, "Experimental and Analytical Evaluation of Flow in
a Square-to-square Wind tunnel Contraction," Journal of Wind
Engineering and Industrial Aerodynamics 89 (2001) 247-262.
[2] G. E. Chmielewski, "Boundary Layer Considerations in the Design of
Aerodynamic Contractions," McDonnell Douglas Research
Laboratories, St. Louis, Mo, VOL. 11,No.8, August 1974.
[3] J. Bottcher, E. Wedemeyer, "The Flow Downstream of Screens and its
Influence on the Flow in the Stagnation Region of Cylindrical bodies,"
Journal of Fluid Mechanics, 204, 501-522, 1989.
[4] T. Sonada, Y. Aihara, "Effects of Pressure Gradient on the Secondary
Instability of Gortler Vortices," A.I.A.A. Paper 81-0197, 1981.
[5] P. Bansod, P. Bradshaw, "The flow in S-shaped ducts," Aeronautical
Quarterly, 23(2), 131-140, 1972.
[6] S. Takagi, A. Nishizawa, N. Tokugawa, "Observation of Gortler
Vortices in Wind-tunel Contraction Boundary Layer," Proc. 3rd Int.
Symposium on Turbulence, Heat and Mass Transfer, (2000) 275-282.
[7] S. Takagi, N. Tokugawa, "Laminar-Turbulent Transition Along The
Contraction Nozzle in Subsonic Flow," 37th AIAA Aerospace Sciences
Meeting and Exhibit, 99-0279, Japan, January 11-14, 1999.
[8] A. Nishizawa, S. Takagi, N. Tokugawa, "rebirth of Turbulence in
Laminarized Boundary Layers Along the wind-tunnel Contraction,"
National Aerospace Laboratory, Chofu, Tokyo 182-8522, Japan, Tadashi
SOBAGAKI, Aoyama Gakuin University, Setagaya, Tokyo 157-8572,
Japan.
[9] M. R. Soltani, M. Dehghan Manshadi, M. J. Mirabdollahi, "Flow Quality
Study in a subsonic Wind Tunnel ," ISME 2004 Conference, Tehran,
Iran, 2004.
[10] M. R. Soltani, M. Dehghan Manshadi, M. J. Mirabdollahi, "An
Experimental Study of the Flow Characteristics in a Subsonic Wind
Tunnel," International Mechanical Engineering Conference, December
5-8, Kuwait, 2004.
[11] H. Ito, R. Kobayashi, Y. Kohama, "The Low-Turbulence Wind Tunnel
at Tohoku University," Aeronautical Journal pf the Royal Aeronautical
Society, April 1992.
[1] F. Fang, J. C. Chen, "Experimental and Analytical Evaluation of Flow in
a Square-to-square Wind tunnel Contraction," Journal of Wind
Engineering and Industrial Aerodynamics 89 (2001) 247-262.
[2] G. E. Chmielewski, "Boundary Layer Considerations in the Design of
Aerodynamic Contractions," McDonnell Douglas Research
Laboratories, St. Louis, Mo, VOL. 11,No.8, August 1974.
[3] J. Bottcher, E. Wedemeyer, "The Flow Downstream of Screens and its
Influence on the Flow in the Stagnation Region of Cylindrical bodies,"
Journal of Fluid Mechanics, 204, 501-522, 1989.
[4] T. Sonada, Y. Aihara, "Effects of Pressure Gradient on the Secondary
Instability of Gortler Vortices," A.I.A.A. Paper 81-0197, 1981.
[5] P. Bansod, P. Bradshaw, "The flow in S-shaped ducts," Aeronautical
Quarterly, 23(2), 131-140, 1972.
[6] S. Takagi, A. Nishizawa, N. Tokugawa, "Observation of Gortler
Vortices in Wind-tunel Contraction Boundary Layer," Proc. 3rd Int.
Symposium on Turbulence, Heat and Mass Transfer, (2000) 275-282.
[7] S. Takagi, N. Tokugawa, "Laminar-Turbulent Transition Along The
Contraction Nozzle in Subsonic Flow," 37th AIAA Aerospace Sciences
Meeting and Exhibit, 99-0279, Japan, January 11-14, 1999.
[8] A. Nishizawa, S. Takagi, N. Tokugawa, "rebirth of Turbulence in
Laminarized Boundary Layers Along the wind-tunnel Contraction,"
National Aerospace Laboratory, Chofu, Tokyo 182-8522, Japan, Tadashi
SOBAGAKI, Aoyama Gakuin University, Setagaya, Tokyo 157-8572,
Japan.
[9] M. R. Soltani, M. Dehghan Manshadi, M. J. Mirabdollahi, "Flow Quality
Study in a subsonic Wind Tunnel ," ISME 2004 Conference, Tehran,
Iran, 2004.
[10] M. R. Soltani, M. Dehghan Manshadi, M. J. Mirabdollahi, "An
Experimental Study of the Flow Characteristics in a Subsonic Wind
Tunnel," International Mechanical Engineering Conference, December
5-8, Kuwait, 2004.
[11] H. Ito, R. Kobayashi, Y. Kohama, "The Low-Turbulence Wind Tunnel
at Tohoku University," Aeronautical Journal pf the Royal Aeronautical
Society, April 1992.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:63502", author = "Dehghan Manshadi M. and Mirzaei M. and Soltani M. R. and Ghorbanian K.", title = "Control of Pressure Gradient in the Contraction of a Wind Tunnel", abstract = "Subsonic wind tunnel experiments were conducted to
study the effect of tripped boundary layer on the pressure distribution
in the contraction region of the tunnel. Measurements were
performed by installing trip strip at two different positions in the
concave portion of the contraction. The results show that installation
of the trip strips, have significant effects on both turbulence and
pressure distribution. The reduction in the free stream turbulence and
reduction of the wall static pressure distribution deferred signified
with the location of the trip strip.", keywords = "Contraction, pressure distribution, trip strip,turbulence intensity.", volume = "2", number = "4", pages = "513-6", }
