翼型尾缘低频大功率合成射流的动态载荷特性研究——B：动态气动载荷特性分析

针对NACA0015翼型,设计了适用于风洞研究的尾缘低频大功率合成射流致动器,对翼型尾缘合成射流作用下的非定常气动特性进行了风洞实验研究。研究表明：尾缘合成射流与横流的相互作用能够有效改变作用在翼型上的气动载荷;单侧喷口喷/吸时,喷冲程气动力系数响应幅值约为吸冲程幅值的3倍;双侧喷口同时工作时,升力和力矩系数的幅值并不是单侧喷口单独工作时喷气幅值的简单叠加,而是处于单侧喷气幅值和喷吸幅值和之间;升力和力矩响应的幅值与喷流动量系数的平方根之间存在近似的线性关系;在动量系数不变时,升力和力矩系数响应的幅值会随减缩频率的增加而减小;给定合成射流器行程,升力和力矩响应幅值与合成射流频率之间近似呈线性关系。

Experimental study on unsteady loads of a synthetic jet at airfoil trailing edge---B：analysis of unsteady aerodynamic loads

A low frequency high power synthetic j et actuator is designed to study the effects of the synthetic jet near the trailing edge of NACA0015 airfoil.The effect of the spout speed,frequency and other parameters on the aerodynamic loads can be studied by changing the ground cylinder stroke or the operating frequency of the motor.The experimental results show that the interaction of the synthetic jet with the upstream can modify the aerodynamic loads obviously.If one jet works,the loads amplitude in the “blowing”process is about 3 times of that in the “suck-ing”process.Moreover,when two jets work,the amplitudes of lift and moment coefficients are not simply the sum of relevant amplitudes of the one jet case,but lie between the amplitudes of one jet work and two jets work sum.The amplitudes of the lift and momentum coefficients show a good proportional relation to the amplitude of the jet velocity,and the amplitudes of the loads decrease with the increase of the reduced frequency.When the stroke of the synthetic jet is fixed, changing the rotate speed of the servomotor,there is a linear relation between the amplitude of the loads coefficients and the rotate speed.