基于ANSYS FLUENT对旋风分离式集沙仪内流场的分析

Analysis of the flow field of whirling separation sand sampler based on ANSYS FLUENT

旋风分离式集沙仪是对土壤风蚀研究的关键设备之一,运用Gambit和ANSYS FLUENT 12.1建立三维模型并对旋风分离式集沙仪进行流场分析,得出其内存在向上和向下两种旋流并且方向是相同的,受短路流的影响,升气管处的速度达到了25.53m/s。在对旋风分离式集沙仪压降研究时发现,在升气管处的动压最大为563Pa,并对其静压分析中,可以发现沿着旋风分离式集沙仪的筒体径向的分布呈现出比较好的轴对称分布,沿轴向除在升气管处静压较大,且为负压,其他沿轴线处的地方相对较低。通过对旋风分离式集沙仪的气相模拟和对压降方面的研究,可以观察并判断出短路流的存在,优化设计人员应根据短路流的特性,优化旋风分离式集沙仪,使短路流对旋风分离式集沙仪的负面影响尽量减少,从而提高分离效率。

Whirling separation sand sampler is one of the key equipment of the research on soil erosion. Creating a three-dimensional model and analyzing the flow field of whirling separation sand sampler based on ANSYS FLUENT 12.1, resulting of the direction is the same in the whirling separation sand sampler regardless of the up and the down and the speed of riser reaches 25.53m/s by the impact of the short-cir- cuit flow. Researching of pressure drop in the whirling separation sand sampler, dynamic pressure of riser reaches 563 Pa. In the analysis of the static pressure, the better ax symmetric distribution can be found along the cylinder radial of the whirling separation sand sampler. Axial direction except at the riser hydrostatic larger as the negative pressure, the other along the axis at a relatively low place. From the research of gas simulation and pressure drop of the whirling separation sand sampler. We can observe and determine the existence of a short-circuit stream. The optimized designers should optimize the whirling separation sand sampler based on the characteristics of the short-circuit flow in order to reduce the negative impact of short-circuit stream of the whirling separation sand sampler as far as possible, thereby improving the separation efficiency.