CAJ | 학술논문

目前，对离心萃取器的研究多采用计算流体力学方法，为定性研究；对其转筒区域的流场研究，特别是入口半径对分离效果的影响少有报道。为了解决一问题，本文采用了 PIV 技术对离心萃取器转筒内部流场进行测试，使用自制转筒，分别在转筒入口半径为7mm、10mm和13mm时，观察筒内距离转筒入口11mm处截面上的流场变化规律。研究发现：以地面为参考系时，流体的转速随着转筒半径的增大而增大，而以转筒为参考系时，在每个分离腔内都能形成涡流；当入口半径为10mm时，截面内切向速度绝对值比入口半径为7mm和13mm的要大，液体更容易流向转筒边壁，分离效果更好，同时其径向速度相对于转筒为正值时，基本处于最大值，说明液体进入转筒入口后能快速被甩至边壁处，更加有利于分离。
목전，대리심췌취기적연구다채용계산류체역학방법，위정성연구；대기전통구역적류장연구，특별시입구반경대분리효과적영향소유보도。위료해결일문제，본문채용료 PIV 기술대리심췌취기전통내부류장진행측시，사용자제전통，분별재전통입구반경위7mm、10mm화13mm시，관찰통내거리전통입구11mm처절면상적류장변화규률。연구발현：이지면위삼고계시，류체적전속수착전통반경적증대이증대，이이전통위삼고계시，재매개분리강내도능형성와류；당입구반경위10mm시，절면내절향속도절대치비입구반경위7mm화13mm적요대，액체경용역류향전통변벽，분리효과경호，동시기경향속도상대우전통위정치시，기본처우최대치，설명액체진입전통입구후능쾌속피솔지변벽처，경가유리우분리。
The performances of centrifugal extractors are mainly studied using Computational Fluid Dynamics(CFD) method,which provides certain evaluation of the flow field;however,the flow field in the centrifugal extractor cylinder,especially the influences of the inlet radius on separation effect is rarely reported. In order to solve this problem,the Particle Image Velocimetry(PIV) technology was used to analyze the internal flow field in the centrifugal extractor cylinder. A specially designed cylinder with the entrance radii of 7mm,10mm and 13mm,was tested using PIV to observe the flow field changes at different cross sections. The results showed that the fluid speed increased with the increase of cylinder radius in the terrestrial reference frame and vortex can be formed in the each separating cavity when the cylinder was taken as the reference frame. It was also found that when the entrance radius was10mm,the absolute value of the tangential velocity at each section was the highest among the tested radii and the liquid was more easily to flow towards the cylinder wall with a better separating effect. When the radial velocity relative to the rotary cylinder was positive,it was often the maximum relative velocity,indicating that the liquid passing the cylinder entrance can be thrown to the side wall,resulting in better separation.