![]() ![]() © 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. This work was conducted as a part of the JAXA-Keio University collaborative research and also supported by JSPS KAKENHI Grant No. Hiroshi Kobayashi (JAXA) for technical support of this work. Keita Ando (Keio University) for fruitful discussion and to Mr. T1 - Friction drag reduction on a clark-Y airfoil using uniform blowing In addition, we confirm that passive blowing control is feasible, and the local friction drag is reduced by it.", Through these procedures, we estimate 40% local friction drag reduction at most. Therefore, the velocity profile in the boundary layer is corrected through modified log-law by taking into account the blowing effects and fitted to the theoretical profile with pressure gradients to determine the friction velocity. We have also attempted a quantitative assessment of the control effect however, it is found to be difficult because we need an exact value of velocity gradient on the wall and also need to consider how pressure gradient affects on the flow behaviors in control regions, which cannot be measured directly. This behavior is consistent with that observed in the previous studies on a flat plate, and it qualitatively suggests that the local friction drag is reduced by uniform blowing. In the active blowing case, the velocity profile in the control region is shifted away from the wall. The angle of attack is set to 0◦ and 6◦ in the active blowing case and 6◦ in the passive blowing case. The experiment is carried out at the free-stream velocity of 58 m/s: the Reynolds number based on the chord length is 1.5 × 106. The uniform blowing is applied on the rear part of the upper surface both actively using a compressor and passively using the pressure difference on the airfoil. In addition, we confirm that passive blowing control is feasible, and the local friction drag is reduced by it.Ībstract = "Effects of uniform blowing on a Clark-Y airfoil are investigated experimentally aiming at turbulent friction drag reduction. ![]() The angle of attack is set to 0 ◦ and 6 ◦ in the active blowing case and 6 ◦ in the passive blowing case. The experiment is carried out at the free-stream velocity of 58 m/s: the Reynolds number based on the chord length is 1.5 × 10 6. Effects of uniform blowing on a Clark-Y airfoil are investigated experimentally aiming at turbulent friction drag reduction.
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