某运输机加装失速条气动特性研究

发布时间：2018-03-26 06:09

本文选题：失速条　切入点：失速特性　出处：《实验流体力学》2016年05期

【摘要】：为改善某运输机着陆襟翼构型失速急剧滚转问题,采用数值计算和风洞实验方法优选了机翼失速条的外形参数,并对气动力和流场特性进行了研究分析。以失速条高度H和安装位置距离前缘的长度S为设计变量,采用求解RANS方程的方法研究了失速条对着陆构型翼型二维特性的影响,表明S越小(即越靠近上翼面)失速迎角提前越多,H增大也能使失速迎角提前但敏感性小于S。失速条后方产生了分离气泡且随迎角增加而逐渐增大增长,在破裂后导致翼型失速提前,使升力线出现圆弧形的失速特征。设计了4种失速条在机翼上的平面布局方案,通过缩比模型风洞实验验证表明:40%半展长处展向长度2m,S=0的失速条使升力线由急剧失速变为平顶型失速并消除了失速后的不对称滚转力矩,将此失速条展长缩小一半的2种方案也不同程度地改善了失速形态,15%半展长处失速条对失速特性无明显改善,主要原因是气流分离从约40%半展长处开始发生,失速条安装在这一展向位置时才能发挥作用。
[Abstract]:In order to improve the stall and sharp rolling problem of landing flap configuration of a transport aircraft, the parameters of airfoil stall strip were selected by numerical calculation and wind tunnel experiment. The aerodynamic and flow characteristics are studied and analyzed. Taking the height H of the stall strip and the length S of the front edge of the installation position as design variables, the effect of the stall strip on the two-dimensional characteristics of the landing airfoil is studied by solving the RANS equation. It is shown that the smaller S (that is, closer to the upper wing), the earlier the stall angle of attack (H) increases, but the sensitivity is less than that of S. the separation bubble is produced at the rear of the stall strip and increases gradually with the increase of the angle of attack. After rupture, the airfoil stall ahead of time, which makes the lift line stall in arc shape. The plane layout of four kinds of stall strips on the wing is designed. The wind tunnel experiment of the shrinkage model shows that the stall strip of 20% 50% span length of 2 mS0 causes the lift line to change from a sharp stall to a flat-top stall and eliminates the asymmetrical rolling torque after stall. The two schemes of reducing the length of the stall strip by half have also improved the stall shape to some extent by 15% and a half. The main reason is that the flow separation starts from about 40% and a half. The stall bar only works when installed in this extended position.
【作者单位】：中航飞机股份有限公司研发中心;
【分类号】：V211.4

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