あらさの異なる二平面の接合面上に発達する流れ場に関する実験

抄録

Measurements of time-mean properties of the turbulent boundary layer developing on the plane wall with lateral roughness discontinuities has been made. Results are summarized as follows : The spanwise non-uniformity of the boundary layer characteristics was caused due to the discontinuity of wall shear stress in the regions of spanwise transition from rough to smooth wall-condition, and this tendency still remains in the downstream direction. Owing to the evaluation of the energy thickness, a degree of spanwaise non-uniformity increase to the downstream direction, and for the rough wall parts it arises largely.