基于合成射流的高空飞艇分离流控制  

Separation Flow Control of Airship with Synthetic Jet

作　　者：曾友兵 胡涛 徐小芮 马宝峰[2] ZENG You-bing;HU Tao;XU Xiao-rui;MA Bao-feng(China Special Vehicle Research Institute,Jingmen 448035,China;Key Laboratory of Fluid Mechanics,Ministry of Education,Beihang University,Beijing 100191,China)

机构地区：[1]中国特种飞行器研究所,荆门448035 [2]北京航空航天大学流体力学教育部重点实验室,北京100191

出　　处：《科学技术与工程》2020年第1期367-372,共6页Science Technology and Engineering

摘　　要：采用数值模拟方法研究了基于合成射流技术的高空飞艇流动控制方法。将合成射流装置安放在飞艇表面,靠近分离线处,并沿分离线布置,通过合成射流口吹吸空气产生涡流,并将其注入边界层内来达到延缓流动分离,进而达到减阻和大迎角阵风减缓的目的。研究首先利用对原始飞艇进行仿真,找到分离线的位置,进而研究了合成射流口出射速度幅值不同时飞艇阻力系数的变化,并以此来分析合成射流的流动控制效果。结果表明,射流口吹吸速度幅值越大,时均减阻效果越好,但射流的能量消耗也越大,气动力的脉动幅值也大。在扣除合成射流本身的能量消耗影响以后,最优的时均控制效果发生在迎角30°左右。研究结果显示,合成射流可以用来降低飞艇小迎角下的巡航阻力,也可以用来控制大迎角情况下的瞬态气动力,从而作为阵风减缓措施。To improve the flow control of a high-altitude airship,the flow control with synthetic jets was simulated numerically.The synthetic jets were placed along the primary separation lines of the airship,and were injected into boundary layers around the airship through slots on the wall to generate vortex flows,thus delaying flow separation,reducing dragging,and mitigating the attack of high-angle gust.First,the original airship was simulated to find the locations of the primary separation lines,and the variation in drag coefficient of the airship with various amplitudes of the synthetic jet was studied.Second,the flow control effect of the synthetic jets was analyzed.The results show that a greater suction velocity had larger reduction in time-averaged drag,but more cost in energy consumption and larger fluctuation in aerodynamic force.By deducting the energy consumption of synthetic jet,optimal time-averaged control at about 30°of attack was achieved.The study indicates that synthetic jets can be used to reduce cruise drag of airship at lower windward angle and to mitigate the gust at a high angle of attack by controlling transient aerodynamic force.

关 键 词：高空飞艇 合成射流 流动控制 大迎角 分离流 

分 类 号：V211.54[航空宇航科学与技术—航空宇航推进理论与工程]