自激振荡脉冲射流减阻特性的多目标优化设计  

Multi-Objective Optimization Design of Drag Reduction Characteristics of Self-Excited Oscillation Pulse Jet

作　　者：汪朝晖[1] 冯亚楠 高全杰 WANGZhao-hui;FENG Ya-nan;GAO Quan-jie(School of Mechanical Engineering,Wuhan University of Science and Technology,Hubei Wuhan 430081,China)

机构地区：[1]武汉科技大学机械自动化学院,湖北武汉430081

出　　处：《机械设计与制造》2022年第8期47-53,共7页Machinery Design & Manufacture

基　　金：国家自然科学基金(51875419)。

摘　　要：自激振荡腔室结构的无量纲参数对自激振荡脉冲射流减阻特性有重要影响。以上下游管径比d2/d1、上游入口管腔径比DT/d1和腔室长径比L/DT为三个关键结构参数,以出口壁面平均剪切应力表示壁面摩擦阻力,以出口流道平均速度梯度表示流体内摩擦阻力,分析了无量纲结构参数对自激振荡脉冲减阻特性的影响。采用大涡模拟数值方法和面心复合设计相结合,计算得到了初始样本点集。通过面心复合设计与响应面法结合来建立响应面近似模型,并采用NSGA-II算法对自激振荡腔室无量纲结构参数进行多目标优化,得到自激振荡腔室无量纲结构参数的Pareto最优解集,并引入权重与中心点结构进行对比。结果表明:d2/d1对出口壁面平均摩擦阻力起主导作用,并随着d2/d1的增大而减小,d2/d1,DT/d1,L/DT无明显交互作用。DT/d1对出口流道平均内摩擦阻力起主导作用,并随着DT/d1的减小而减小,d2/d1与L/DT之间存在明显交互作用。与中心点结构相比,出口壁面平均摩擦阻力和出口流道平均内摩擦力分别减少了43.01%和54.52%。经过多目标优化后的自激振荡腔室减阻性能得到了显著提高,研究结果为自激振荡脉冲减阻增输装置设计提供理论基础。The dimensionless parameters of the self-excited oscillation chamber structure have an important effect on the drag reduction characteristics of the self-excited oscillation pulse jet.The ratio of the upstream and the downstream pipe diameter d2/d1,Ratio of the upstream inlet pipe diameter to the cavity diameter DT/d1,and the chamber length-diameter ratio L/DT are the three key structural parameters.The wall surface friction resistance is represented by the average wall shear stress at the outlet,and the internal friction resistance of the fluid is represented by the average velocity gradient of the outlet flow channel.The influence of the dimensionless structural parameters on the drag reduction characteristics of the self-excited oscillation pulse is analyzed.Using the large eddy simulation numerical method and the face central composition design,the initial sample point set was calculated.The face central composition design and response surface method are combined to establish a response surface approximation model,and the NSGA-II algorithm is used to optimize the dimensionless structural parameters of the self-excited oscillation chamber by multi-objective optimization.The Pareto Front is introduced into the weight and compared with the center point structure.The results show that d2/d1 dominates the average frictional resistance of the outlet wall and decreases with increasing d2/d1.There is no significant interaction between d2/d1,DT/d1,and L/DT.DT/d1 dominates the average internal frictional resistance of the outlet flow channel,and decreases with the decrease of DT/d1.There is a significant interaction between d2/d1 and L/DT.Compared with the center point structure,the average frictional resistance of the outlet wall and the average internal frictional force of the outlet flow path were reduced by 43.01%and 54.52%,respectively.After multi-objective optimization,the drag reduction performance of the self-excited oscillation chamber has been significantly improved.The research results provide a theoretical

关 键 词：自激振荡 多目标优化 面心复合设计 响应面近似模型 壁面剪切应力 法向速度梯度 脉冲射流减阻 

分 类 号：TH16[机械工程—机械制造及自动化] TH122