螺旋流三分支管多维流场的测量与数值模拟  

Measurement and Numerical Simulation on Multi Dimensional Flows in the Swirl Three Branched Pipe

作　　者：帅石金[1] 刘永长[2] 

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084 [2]华中理工大学动力工程学院,武汉430074

出　　处：《内燃机学报》1999年第3期277-280,共4页Transactions of Csice

基　　金：中国船舶工业公司国防预研基金

摘　　要：排气系统对发动机的性能有很大影响，作者在 Ｍ Ｐ Ｃ排气系统的基础上，提出了一种新型螺旋流排气系统，它利用支管与总管切向斜交，使气体从支管流出后在总管内产生螺旋运动，可以减小气体由支管进入总管时的撞击损失，同时可以防止扫气干扰；气体产生螺旋运动还可以减少总管横截面的二次流损失和局部回流损失。为了深入研究螺旋流排气系统的工作机理，作者利用三维粒子动态分析仪（３ Ｄ Ｐ Ｄ Ａ），对一始端螺旋流三分支模件的稳态湍流流场进行了测量，并用 Ａ Ｌ Ｅ法进行了三维流动数值模拟。模拟结果与测量结果基本吻合，反映了模件流场的三维特征。The exhaust system has an important influence on the performance of internal combustion engines.On the basis of the MPC exhaust system,the authors presented a new swirl exhaust system in which the branch pipe obliquely intersects the main pipe along tangent direction.The system makes the gases ejected from branch pipe produce a spiral motion around the axis of main pipe,which can reduce the collision loss of gases between the branch pipe and main pipe and can also prevent the interference of scavenging and decrease the losses of the second flows in the cross section and the recirculation flows in main pipe.In order to understand the swirl system deeply,the three dimensional particle dynamic analyzer (PDA) was used to measure the velocities of the steady turbulent cold flows in the swirl three branched modular junction located at the end of the exhaust system,and three dimensional numerical simulation of the flows was carried out by use of the ALE algorithm.The calculating results have a good agreement with the measuring ones and embody three dimensional features of the flows in the junction.

关 键 词：螺旋流 三分支管 多维流场 测量 数值模拟 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]