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Control of separation in the concave portion of contraction to improve the flow quality

Ghorbanian, K ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1017/S0001924000011465
  3. Publisher: 2009
  4. Abstract:
  5. Subsonic wind tunnel experiments were conducted to study the effect of forced transition on the pressure distribution in the concave portion of contraction. Further more, the effect of early transition on the turbulence level in the test section of the wind tunnel is studied. Measurements were performed by installing several trip strips 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 intensity and on the pressure distribution. The reduction in the free stream turbulence as well as the wall static pressure distribution varied significantly with the location of the trip strip. The results confirm the significant impact of the tripped boundary layer on the control of adverse pressure gradient. The trip strip at XIL = 0115 improves pressure distribution in contraction and reduces turbulence intensity in the test section, considerably
  6. Keywords:
  7. Adverse pressure gradient ; Flow quality ; Freestream turbulence ; Significant impacts ; Static pressure distributions ; Subsonic wind tunnels ; Test sections ; Trip strips ; Turbulence intensity ; Turbulence level ; Aerodynamics ; Installation ; Pressure gradient ; Shrinkage ; Tunnels ; Turbulence ; Wind tunnels ; Pressure effects
  8. Source: Aeronautical Journal ; Volume 113, Issue 1141 , 2009 , Pages 177-182 ; 00019240 (ISSN)
  9. URL: https://www.cambridge.org/core/journals/aeronautical-journal/article/control-of-separation-in-the-concave-portion-of-contraction-to-improve-the-flow-quality/AE7C64DE2E23D59A3FA7D32FA4872E56