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针对各种飞行器大舵偏下出现的流动分离问题,在北航D4风洞对旨在消除舵面流动分离的舵面前缘吹气技术进行了研究,为了降低控制分离所用的吹气量,吹气点设置在舵面前缘气流分离点处.应用粒子图像测速(PIV,Particle Image Velocimetry)技术,分析了舵面绕流在吹气量由小变大过程中所经历的3个不同演化阶段;由测压得到的舵面压力分布则显示,前缘吹气造成的引射作用使前缘吸力峰随吹气量增大而增大,这是前缘吹气能够使舵面升力增大的主要机理.实验结果还表明,前缘吹气可明显提高舵面升力,同时也可以显著降低舵面阻力.
In order to reduce the flow separation problem occurred at the lower end of various aircraft large rudders, a study was conducted on the front air blowing technology at the Beihang D4 wind tunnel to eliminate the flow separation on the rudder surface. In order to reduce the blowing volume for the control separation, Which is located at the point of airflow separation at the leading edge of the rudder.PIV (Particle Image Velocimetry) technique is used to analyze the three different evolution stages of the flow around the rudder flowing from small to large, The pressure distribution on the rudder surface shows that the leading edge suction force increases the suction peak of the leading edge with the increase of the air blowing amount, which is the main mechanism of the leading edge blowing force increasing the lift force of the rudder surface. The results also show that the front air blowing can significantly improve the rudder lift, but also can significantly reduce the rudder resistance.