Study on circulation control of flying wing based on Coanda effect

基于柯恩达效应的飞翼布局环量控制研究

¹ Shenyang Aircraft Design and Research Institue, Shenyang 110035, China
² China Aerodynamics Research and Development Center, Mianyang 621000, China

Received: 11 July 2021

Abstract

In recent years, it has been a hot spot to use flow control technology to generate control capability similar to mechanical rudder. Taking the flying wing configuration as the research object, based on CFD and low speed wind tunnel test, the circulation control of airfoil and wing based on Coanda effect is studied, and the parameter influence law and control effect are given. The results show that: when the rear edge of the wing is opened with the corresponding slot, the control capability of the upper-surface blowing is similar to that of the mechanical rudder; the control capacity of pitch and roll is increased with the decreasing of jet height and the increasing of air pressure ratio, the pitching and rolling capacity increases first and then decreases; the control effect of circular Coanda surface is better than elliptical Coanda surface; the pitching and rolling control effect of the optimized circulation-control scheme in Ma=0.2 is not lower than that of the mechanical rudder, the corresponding flow flux is about 0.05~0.07 kg/s.

摘要

采用流动控制技术产生类似机械舵面的控制能力是近些年的研究热点。以飞翼布局为研究对象, 从二维翼型到三维机翼, 通过CFD计算和低速风洞试验, 开展了基于柯恩达效应的机翼后缘喷气环量控制研究, 给出了参数影响规律和控制效果。结果表明: 机翼后缘布置柯恩达型面和对应喷口, 通过上表面喷口吹气产生类似机械舵面正偏的控制能力, 下表面喷口吹气产生类似机械舵面负偏的控制能力; 随着喷口的高度减小, 环量控制能力逐渐增大; 随喷气压比增加, 环量控制能力先增大后减小; 圆形的柯恩达型面相比椭圆形控制效果更佳; 优化环量方案在Ma=0.2时产生的操纵能力不低于机械舵面, 对应流量需求在0.05~0.07 kg/s左右。