The effectiveness of tripping wire on boundary layer transition and turbulence measurement of the wire wake.

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  • 境界層の乱流遷移におけるトリッピングワイヤ効果とワイヤ後流の測定
  • キョウカイソウ ノ ランリュウ センイ ニ オケル トリッピングワイヤ コウカ

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Experimental studies were performed to investigate the effect of a tripping wire on the boundary-layer transition over a 15 degree wedge in an external free stream. Turbulence measurements were carried out in the range from the wake of the wires to the laminar-turbulent transition region. The results indicated that the tripping wire becomes effctive at the wire Reynolds number R-k (=U∞xk/ν) larger than Rk1 where Rk1=570 (zk/k) -4.3×103, and that the transition Reynolds number Rt (=U∞xt/ν) at the most effective condition is given as the formula Rt =1.06 Rk+1.33×104, in which U∞ denotes the free stream velocity, xk and xt the location of the wire and the transition point measured from the apex of the wedge, respectively, k the wire diameter andνthe kinematic viscosity of the fluid. The Reynolds number in the experiments ranged from U∞xk/ν=(0.09-2.0) ×105 and xk/k=25 to 200.

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