DEVELOPMENT OF PRE-SET WAVELENGTH GOERTLER VORTICES

机译：预设波长戈特勒涡旋的开发

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The development of Goertler vortices with uniform wavelength has been investigated in the boundary-layer on a concave surface of 2.0 m radius of curvature at a free-stream velocity of 3.0 m/s. The wavelengths of vortices were pre-set by vertical wires of 0.2 mm diameter located 10 mm upstream of the concave surface leading edge. The velocity contours in the cross-sectional planes at several streamwise locations show the growth and breakdown of the vortices which are similar to those found in transitional flow field. Three different regions can be identified as the 1st, 2nd, and 3rd region, each representing different growth rate of the vortices. The occurrence of a secondary instability mode is indicated by the formation of a small horseshoe eddies generated between the two neighboring vortices traveling streamwise, to form mushroom-like structures as a consequence of the non-linear growth of the Goertler vortices. The breakdown of this structures before the boundary-layer flow becomes turbulence, is also shown to indicate the start of transition in the flow. The Goertler number at the start of the transition is found to be within the range of transitional Goertler numbers previously reported for naturally developed Goertler vortices.

机译：在自由流动速度为3.0 m / s的情况下，在曲率半径为2.0 m的凹面的边界层中研究了波长均匀的Goertler涡旋的发展。旋涡的波长由位于凹面前缘上游10 mm处的直径为0.2 mm的垂直线预设。在几个流向位置的横截面上的速度轮廓显示了涡旋的增长和破裂，这与在过渡流场中发现的相似。可以将三个不同的区域标识为第一，第二和第三区域，每个区域代表不同的涡流增长率。通过在两个相邻的涡流之间产生小马蹄涡流，表明二次失稳模式的发生，这是由于Goertler涡流的非线性增长而形成的蘑菇状结构。在边界层流动成为湍流之前，这种结构的破坏也表明流动开始过渡。发现过渡开始时的Goertler数在先前报道的自然发展的Goertler涡旋的过渡Goertler数范围内。

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来源
《International Symposium on Fluid Machinery and Fluid Engineering(ISFMFE); 20041201-03; Beijing(CN)》|2004年|P.90-101|共12页
会议地点 Beijing(CN)
作者
S.H. Winoto; H. Mitsudharmadi; D.A. Shah;
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作者单位

Department of Mechanical Engineering, National University of Singapore 10 Kent Ridge Crescent, Singapore 119260, SINGAPORE;

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原文格式 PDF
正文语种 eng
中图分类流体力学;
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DEVELOPMENT OF PRE-SET WAVELENGTH GOERTLER VORTICES

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