缝道几何构型对翼型气动特性的影响  

Influence of slot geometry configuration on airfoil aerodynamic characteristics

作　　者：郝礼书[1] 林梓佳 屈昊阳 王暕书 高永卫[1] HAO Lishu;LIN Zijia;QU Haoyang;WANG Jianshu;GAO Yongwei(National Key Laboratory of Science and Technology on Aerodynamic Design and Research,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学翼型叶栅空气动力学国家级重点实验室,西安710072

出　　处：《空气动力学学报》2023年第11期36-45,I0001,共11页Acta Aerodynamica Sinica

基　　金：科工局重点实验室稳定支持项目(D5050210009)。

摘　　要：为深入研究翼型开缝抑制翼型吸力面流动分离的被动流动控制技术,在探讨开缝依据的基础上,针对NACA 4421翼型设计了7种缝道构型,并给出了缝道构型之间的几何联系,对比分析了曲线、折线及直线3种形式的缝道对翼型失速的控制效果,发现曲线缝道能够显著提高翼型的最大升力系数和失速迎角;分析了曲线缝道构型升力系数“双峰”现象的机理,提出了一种新型导流片缝道构型,该构型利用“科恩达效应”能够全面改善基准翼型的失速特性,失速迎角推迟可达14°,最大升力系数提高122%,达到2.785,可为增升装置设计提供新的思路和参考。Airfoil slotted is a passive flow control technology that can effectively inhibit flow separation on the airfoil suction surface,and it has been widely studied by researchers domestically and abroad.In this study,slots on the airfoil NACA 4421 are investigated with numerical simulations.The selection of the slot location on the airfoil is first analyzed,and the influence of the geometry change of the slot on the stall characteristics of the airfoil is discussed.Seven slot configurations are designed,and the geometric relations among them are given.The flow control effects of slots with curve lines,polylines and straight lines,on the airfoil stall are compared.It is found that the curve-line slot can significantly improve the maximum lift coefficient and the stall angle of attack of the airfoil.The"double peak"phenomenon of the lift coefficient distribution of the curve-line slot airfoil is analyzed,and the design of a new deflector slot is proposed.This new slot configuration is based on the Coanda effect,and can improve the stall characteristics of the baseline airfoil comprehensively,with the stall angle of attack delayed by 14°and the maximum lift coefficient increased by 122%to 2.785.The deflector slot presented in this study provides a novel idea and reference for the design of high-lift devices.

关 键 词：翼型开缝 数值分析 流动控制 导流片 科恩达效应 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]