CAJ | 학술논문

螺旋流一般通过切向进流、安装导流片或旋转管道三种方式产生，但Horii等人通过实验发现有三种装置也产生了非常稳定的螺旋流。本文利用数值模拟对其中的一种螺旋流形成过程与机制进行了研究。计算结果证实了双涡结构向单涡结构演化现象并揭示了收缩管道的优点以及不同倾向进流的区别。在数值模拟时本文分别选取了线性、二及三阶涡粘性湍流模式，但数值实验表明线性与二阶模式的计算结果差别不大，说明在数值模拟湍流螺旋流时二阶涡粘性模式作用不大。而三阶模式则表现出具有预测对称性进流向非对称结构转化的能力。
라선류일반통과절향진류、안장도류편혹선전관도삼충방식산생，단Horii등인통과실험발현유삼충장치야산생료비상은정적라선류。본문이용수치모의대기중적일충라선류형성과정여궤제진행료연구。계산결과증실료쌍와결구향단와결구연화현상병게시료수축관도적우점이급불동경향진류적구별。재수치모의시본문분별선취료선성、이급삼계와점성단류모식，단수치실험표명선성여이계모식적계산결과차별불대，설명재수치모의단류라선류시이계와점성모식작용불대。이삼계모식칙표현출구유예측대칭성진류향비대칭결구전화적능력。
In general, swirling flows in pipes are generated by three means:tangentially inleting medium; guiding fluids by vanes with a certain angle and axially rotat ing pipe. But experiments of Horii and his co-workers discovered that three ki nds of apparatuses can also cause swirling flows with none of the three methods. In our work, the velocity fields of the swirling flow took place in one of the three apparatuses were simulated. The results confirmed the phenomenon of asymme tric double vortices evolving into a single vortex and showed the merits of the contracting portion as well as the distinctions between the different inflow man ners. By comparison of the results of linear, quadratic and cubic turbulent mode ls, the cubic model's irregularity of breaking symmetry was exposed.