Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Turbulent boundary layer on an elongated axisymmetric body with air blowing and permeable surface roughness

Turbulent boundary layer on an elongated axisymmetric body with air blowing and permeable surface... Results of numerical and experimental investigations of the efficiency of distributed air blowing through a perforated section of an axisymmetric body of revolution in an essentially incompressible flow with the Reynolds number ReL = 4.24·106 are reported. The blowing coefficient Cb is varied in the interval 0–0.00885. The Reynolds number Re** based on the momentum thickness δ** ahead of the perforated section is 5600. As the streamwise coordinate x increases, stable reduction of local skin friction is observed up to the distance of 600δ** from the blowing region; the maximum value of the local skin friction coefficient reaches 56.5% directly in the region of blowing with the maximum intensity. It is found that spontaneous blowing, which occurs due to the natural difference between the barometric and static pressures in the wind tunnel test section, can also ensure reduction of the skin friction coefficient whose value in the above-noted flow region in the main operation regime is 28.5%. The specific features of the flow around the body of revolution in the case of inner roughness of the perforated surface are analyzed through numerical simulations, and it is demonstrated that it is necessary and important to take into account this factor accompanying the blowing process. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Thermophysics and Aeromechanics Springer Journals

Turbulent boundary layer on an elongated axisymmetric body with air blowing and permeable surface roughness

Kornilov, V. I.
Thermophysics and Aeromechanics , Volume 29 (4) – Jul 1, 2022
Download PDF
17 pages

Loading next page...
 
/lp/springer-journals/turbulent-boundary-layer-on-an-elongated-axisymmetric-body-with-air-0BrvoO5Z7e

References (47)

Publisher
Springer Journals
Copyright
Copyright © V.I. Kornilov 2022
ISSN
0869-8643
eISSN
1531-8699
DOI
10.1134/s0869864322040023
Publisher site
See Article on Publisher Site

Abstract

Results of numerical and experimental investigations of the efficiency of distributed air blowing through a perforated section of an axisymmetric body of revolution in an essentially incompressible flow with the Reynolds number ReL = 4.24·106 are reported. The blowing coefficient Cb is varied in the interval 0–0.00885. The Reynolds number Re** based on the momentum thickness δ** ahead of the perforated section is 5600. As the streamwise coordinate x increases, stable reduction of local skin friction is observed up to the distance of 600δ** from the blowing region; the maximum value of the local skin friction coefficient reaches 56.5% directly in the region of blowing with the maximum intensity. It is found that spontaneous blowing, which occurs due to the natural difference between the barometric and static pressures in the wind tunnel test section, can also ensure reduction of the skin friction coefficient whose value in the above-noted flow region in the main operation regime is 28.5%. The specific features of the flow around the body of revolution in the case of inner roughness of the perforated surface are analyzed through numerical simulations, and it is demonstrated that it is necessary and important to take into account this factor accompanying the blowing process.

Journal

Thermophysics and Aeromechanics – Springer Journals

Published: Jul 1, 2022

Keywords: axisymmetric body; turbulent boundary layer; distributed blowing; perforated region; friction

There are no references for this article.