H307 THE TEMPORAL AMPLIFICATION OF THE KARMAN BOUNDARY-LAYER(Heat transfer control)

概要

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The hydrodynamic instability of the three-dimensional boundary layer on a rotating disk introduces a periodic modulation of the mean flow in the form of stationary cross flow vortices. The instability labeled Type II by Faller occurs first at lower Reynolds number than that of well known Type I instability. Detailed numerical values of the growth rates, neutral curves and other characteristics of the two instabilities have been calculated over a wide range of parameters. Presented are the neutral stability results concerning the two instability modes by solving new linear stability equations reformulated not only by considering whole convective terms but by correcting some errors in the previous stability equations. The present stability results are agree with the previously known ones within reasonable limit. The flow is found to be always stable for a disturbance whose dimensionless wave number is greater than 0.75. Also, some temporal amplification contours have been calculated for the stationary disturbance wave, whose azimuth angle ε = 11.29〜15°.
一般社団法人日本機械学会の論文
2000-10-01