细长旋成体绕流特性数值模拟研究  

Numerical Simulation Study on Flow Characteristics Around a Slender Body

作　　者：冯瑞强 李晓明[1] 王宇天 FENG Ruiqiang;LI Xiaoming;WANG Yutian(Aviation University of Air Force,Changchun,Jilin Province,130000 China)

机构地区：[1]中国人民解放军空军航空大学,吉林长春130000

出　　处：《科技创新导报》2022年第30期5-12,共8页Science and Technology Innovation Herald

摘　　要：为深入研究细长旋成体有迎角时的绕流特性,本文通过数值模拟方法研究迎角、扰动块位置对细长旋成体绕流特性的影响。研究表明,小迎角时,细长旋成体不受侧向力,流场结构呈附着流态或对称涡流态,物面压力对称分布,这一迎角区域被称为“零侧向力区”;随着迎角增加,侧向力会逐渐增加,并且在50°迎角时侧向力达到最大,在这一迎角范围内,侧向力大小随扰动块周向位置变化而连续变化,这一迎角区域又被称为“连续区”;之后,继续增大迎角,侧向力有所减小,但是侧向力大小随扰动块周向位置不再变化,只是方向会发生改变,这一迎角区域又被称为“双稳态区”。细长体侧向力随扰动块周向位置变化呈“单周期”变化规律,在“连续区”,扰动块周向位置越远离纵向非对称面,细长体侧向力越大;在“双稳态区”,扰动块周向位置变化不改变侧向力大小,但是比较靠近头部的截面侧向力却表现出了“连续区”的变化规律。In order to study the flow characteristics of slender bodies at an angle of attack,the effects of the angle of attack and the position of the disturbance block on the flow characteristics of slender bodies were studied by numerical simulation.The results show that at low angles of attack,the slender body is free of lateral force,the flow field structure is in the attached flow state or symmetric vortex flow state,and the body surface pressure is symmetrically distributed.This area of angle of attack is called the"zero lateral force zone".With the increase of the angle of attack,the lateral force will gradually increase,and at 50°angle of attack,the lateral force will reach the maximum.Within this attack angle range,the magnitude of the lateral force changes continuously with the circumferential position of the disturbance block,and this area of the angle of attack is called the"continuous zone".After that,when the angle of attack continues to increase,the lateral force decreases,but the magnitude of the lateral force does not change with the circumferential position of the disturbance block,but the direction will change.This area of the angle of attack is also known as the"bistable zone".The lateral force of the slender body changes with the circumferential position of the disturbance block in a"single period"way.In the"continuous area",the more the circumferential position of the disturbance block is far away from the longitudinal asymmetric plane,the greater the lateral force of the slender body.In the"bistable zone",the change of the circumferential position of the disturbance block does not change the magnitude of the lateral force,but the lateral force of the section closer to the head shows the change rule of the"continuous zone".

关 键 词：细长旋成体 迎角 周向位置 绕流特性 数值模拟 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]