定常射流阵列控制地面车辆气动阻力  

Aerodynamic drag control of a ground vehicle using steady blowing array

作　　者：崔文诗[1,2] 杨志刚 王国俊[1,2] 

机构地区：[1]同济大学上海地面交通风洞中心,上海201804 [2]上海市地面交通工具空气动力与热环境模拟重点实验室,上海201804 [3]北京民用飞机技术研究中心,北京102211

出　　处：《中南大学学报（自然科学版）》2017年第11期2913-2918,共6页Journal of Central South University:Science and Technology

基　　金：上海市地面交通工具风洞中心专业技术服务平台资助项目(14DZ229140)~~

摘　　要：为了控制地面车辆气动阻力,通过风洞实验和大涡模拟仿真方法,研究定常射流对地面车辆流动控制的影响;研制由17只定常射流器构成的射流阵列装置,将其安装在车辆顶部和斜背交界处,进行流动控制实验;探讨射流倾角和动量系数等射流参数对三维地面车辆的非定常流动和气动力的控制机理。研究结果表明:数值仿真方法可有效模拟气动力变化趋势。动量系数不改变气动力变化趋势,仅影响变化幅值。射流倾角决定射流出口附近的速度分布,影响气流分离,导致气动力的差异。与无控制下相比,当射流倾角为-25°~65°时,可实现减阻;而当射流倾角为80°~115°时,对应的阻力未减小。In order to control the aerodynamic drag of a ground vehicle, the effect of steady blowing array on the flowover a ground vehicle was investigated through the wind tunnel experiments and large eddy simulations. The array devicecomposed of 17 steady blowing jets was developed, which was set on the junction between the slant and the roof of aground vehicle, and the flow control experiments were carried out. The control mechanism of the excitation parameters,such as the jet direction angle and momentum coefficient, on the unsteady flow and aerodynamics forces of a threedimensional ground vehicle were discussed. The results show that the numerical simulation can effectively simulate thetrend of the aerodynamic force. The momentum coefficient can only affect the amplitude of variation in aerodynamicdrag, not the tendency of drag variation. The jet obliquity dominates the velocity distribution near the jet exit, which hasan influence on the flow separation and leads to the variation of aerodynamic drag. Compared with natural flow, the jetobliquities from -25° to 65° help drag reduction, while the jet obliquities from 80° to 115° make no difference to relevantdrag.

关 键 词：地面车辆 定常射流 射流倾角 流动分离 气动阻力 

分 类 号：U270.1[机械工程—车辆工程] O357.52[交通运输工程—载运工具运用工程]