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为了降低叶片根部马蹄涡的强度,在简化了的叶片-平板结构的上游某位置布置一根绊线.选用k-ωSST湍流模型和SIMPLE算法,使用fluent软件数值模拟不同固定位置、不同高度及不同形状的绊线对叶片根部马蹄涡所产生的影响.结果显示,每一种绊线都能不同程度地削弱马蹄涡系.放置在距离叶片根部d/T=1处且高度h/T=1/20(T为叶片最大厚度,d为绊线距离叶片距离,h为绊线高度)的方形截面形状的绊线,对绊线后的流动分布、流向涡空间尺度和马蹄涡的涡量整体控制有较好的效果.同时定义了表明马蹄涡强度的涡强系数(基于马蹄涡涡心涡量及涡心位置),在此控制工况下涡强系数降到原来的16%.另外,在考虑减小绊线对上游流动影响的情况下,截面为斜角30°的绊线是比较好的选择.
In order to reduce the strength of the horseshoe vortex at the root of the blade, a tripwire is arranged at a simplified position upstream of the blade-plate structure. The k-ωSTST turbulence model and the SIMPLE algorithm are used to simulate the different fixed positions, The results showed that each kind of tripwire can weaken the horseshoe vortex system to some extent.It is placed at a distance of d / T = 1 from the blade root and the height of h / T = 1 / 20 (T is the maximum thickness of the blade, d is the distance of the tripwire from the blade and h is the height of the tripwire), the distribution of the flow after the tripwire, the spatial dimension of the flow vortex and the vorticity of the horseshoe vortex And the control effect is good.At the same time, the eddy strength coefficient (based on the vorticity and vortex center of the horseshoe vortex) that indicates the strength of the horseshoe vortex is defined, and the vortex coefficient decreases to 16% under the control condition.In addition, Considering the effect of reducing the influence of the tripwire on the upstream flow, a tripwire with an oblique angle of 30 ° is a better choice.