带不同形状翼尖帆片的机翼地面效应实验研究

发布时间：2018-04-27 19:31

本文选题：梯形翼尖帆片 + 椭圆翼尖帆片　；参考：《实验流体力学》2016年06期

【摘要】：翼尖帆片将原型机翼集中的翼尖涡分散成多个小涡,加快翼尖涡的耗散,从而降低机翼诱导阻力。为进一步了解翼尖帆片对机翼在地面效应下流动特性的影响,分别对安装有3片椭圆形和梯形帆片的NACA4412机翼开展了风洞实验研究。测量了2种帆片机翼的气动力和翼尖涡结构,并通过比较流动结构,分析了2种机翼气动力产生差异的原因。机翼的升、阻力用六分量盒式风洞天平测量,翼尖涡速度分布用七孔探针扫描获得,以机翼弦线为特征长度的雷诺数为1.5×105。当远离地面时,梯形帆片与椭圆帆片的升、阻力差别较小,但随着机翼逐渐接近地面,梯形帆片的增升减阻效率逐渐高于椭圆帆片。而机翼升阻力的差异,主要是由于局部气流方向角对各帆片形成的有效迎角有所差别,使得帆片对主翼产生不同的增升和减阻贡献。
[Abstract]:The tip sails disperse the wingtip vortices concentrated in the original wing into several small vortices to accelerate the dissipation of the wingtip vortices and thus reduce the airfoil induced resistance. In order to further understand the effect of tip sail on the flow characteristics of the wing under ground effect, wind tunnel experiments were carried out on the NACA4412 wing with three elliptical and trapezoidal sails. The aerodynamic forces and tip vortex structures of two kinds of airfoil wings were measured, and the reasons for the difference of aerodynamic forces between the two wings were analyzed by comparing the flow structures. The lift and drag of the wing are measured by a six-component cassette wind tunnel balance. The vortex velocity distribution at the tip of the wing is scanned with a seven-hole probe. The Reynolds number of the wing chord is 1.5 脳 10 ~ 5. When far away from the ground, the lift resistance of trapezoid sail and elliptical sail is smaller, but with the wing approaching the ground, the efficiency of increasing and reducing drag of trapezoid sail is higher than that of elliptical sail. The difference of the wing lift resistance is mainly due to the difference of the effective angle of attack formed by the direction angle of the local airflow on the sails, which makes the sails have different contributions to the increase and decrease of drag on the main wing.
【作者单位】：上海大学上海市应用数学和力学研究所;上海市力学在能源工程中的应用重点实验室;
【基金】：国家自然科学基金资助项目(11472169)
【分类号】：V211.41

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