同济大学学报（自然科学版）2018，Vol.46Issue(1)：100-108,9.DOI:10.11908/j.issn.0253-374x.2018.01.015
25°Ahmed模型射流主动控制气动减阻策略
Strategy of Active Flow Control to Reduce Aerodynamic Drag with Steady Jet for 25° Ahmed Model
摘要
Abstract
Based on computational fluid dynamics (CFD) numerical simulation method,aerodynamic drag reduction of 25° Ahmed model with active flow control of steady jet are researched using shear stress transport(S ST) λ-ω turbulent model.Jet holes are located at the model tail to study the optimum parameters of hole diameter,distance to the nearest side edge,shape,jet velocity and jet angle,and to analyze the influence of different jet state to the flow structure,total drag coefficient and local drag coefficient.In addition,the numerical simulation results are in good agreement with the date from wind tunnel experiment,which verifies the accuracy and reliability of present numerical method.The numerical results indicate that the wake structure with flow control is significantly improved and the longitudinal vortex is effectively suppressed,compared to the one without control.Simultaneously,the drag coefficient significantly decreases.In the scheme of placing jet hold on the single location,the one placing jet at the top of slant get the lowest drag coefficient 0.252 2 (with 11.3％ drag reduction).The drag coefficient of the optimal combining scheme obtained by orthogonal experiment method is 0.246 7 (with 13.23％ drag reduction).关键词
外流场/主动控制/尾流结构/射流/气动减阻Key words
external flow field/active control/wake structure/jet flow/aerodynamic drag reduction分类
交通工程引用本文复制引用
张英朝,杜冠茂,朱会,田思..25°Ahmed模型射流主动控制气动减阻策略[J].同济大学学报（自然科学版）,2018,46(1):100-108,9.基金项目
国家自然科学基金(11702109、11772140) （11702109、11772140）
