旋转流场下模型大幅俯仰运动实验研究

Experimental Investigation on Aerodynamic Characteristics of Model in Large Amplitude Pitching Movement in a Rotational Flow Field

在中航气动院FL-8低速风洞中,采用单自由度振荡机构进行了旋转流场下大幅俯仰运动的气动特性实验研究。模型在绕风速轴连续旋转的同时,进行给定频率和振幅绕体轴的俯仰振荡运动。测量了模型的动态气动特性,着重分析了不同运动参数对模型气动特性的影响。实验结果表明,旋转速度的存在使大振幅俯仰振荡实验中的滚转力矩和偏航力矩产生了明显的迟滞特性,但对俯仰力矩和法向力的迟滞特性影响不大。

Experimental investigation on unsteady aerodynamic characteristics of model in large amplitude pitching movement in a rotational flow field was conducted in a FL-8 low-speed wind tunnel at China Aerodynamics Research Institute of Aeronautics based on a single degree of freedom oscillation mechanism. The model was oscillated about its body axis with selected pitching frequency and amplitude during its continuous rotation about the wind axis. Six components indicating its unsteady aerodynamic characteristics were measured and the influence of different parameters especially those connected with different motions on the unsteady aerodynamic characteristics of model were analyzed. Results show that the existence of rotational velocity produces obvious influence on hysteresis loops characteristics of the roll moments and the yaw moments in the large amplitude pitching motion test, but it has only a little effect on the hysteresis behavior about the pitch moments and the normal forces.