水力发电学报2013，Vol.32Issue(2)：179-183,5.
低弗劳德数水跃耗散涡尺度的物模研究
Experimental study on Kolmogorov's length scale in hydraulic jumps of low Froude numbers
摘要
Abstract
In this model test, a micro acoustic doppler velocimeter was used as the main method for measurements of the structure of hydraulic jumps at Froude numbers of 1.49, 2.51 and 3.35. Turbulence energy dissipation rate is estimated with the inertial dissipation method, and hence the distribution of Kolmogorov's length scale both inside and outside the jump is obtained. It is shown that eddies in the lower range of Kolmogorov's length scale assemble more closely in the developing boundary layer, the recirculation region and the air-water turbulent shear layer, but then they gradually level off along with the jump moving towards downstream. Under this circumstance, Reynolds number, instead of Froude number, is a dominant factor. On the other hand, the Kolmogorov's length scale within the jump decreases nonlinearly with the growth of Froude numbers, and at the same time, these eddies increase in size more rapidly within a certain distance after the jump. Finally, the scale becomes nearly the same over a cross section at a distance of 2. 5 times the jump length from the toe.关键词
水力学/低弗劳德数/水跃/试验研究/耗散涡/雷诺数Key words
hydraulics/ low Froude number/ hydraulic jump/ experimental study/ Kolmogorov's length scale eddy/ Reynolds number分类
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陈帅,王均星,陈利强,罗贝尔..低弗劳德数水跃耗散涡尺度的物模研究[J].水力发电学报,2013,32(2):179-183,5.
