俯仰-滚摆耦合复杂流场试验研究
Experimental investigation on unsteady flow fieldabout a coupled pitching-rolling delta wing
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摘要: 给出80°三角翼模型在低速风洞中实施俯仰-滚摆耦合大幅度振动的复杂流场测量结果,包括静态和动态、单自由度俯仰和滚摆、俯仰-滚摆耦合运动条件下的流动显示结果和强迫俯仰、自由滚摆条件下的滚转角时间历程测量结果。分析了耦合运动对前缘分离涡和气动特性的影响,以及不同相位角和不同频率对耦合气动特性的影响。结果表明,双自由度的耦合运动比单自由度运动具有更为明显的动态迟滞特性,进一步推迟分离涡的破碎,推迟开始滚摆的攻角αwr。Abstract: The paper gives the measurements results of complex flow fieldabout a delta wing couple d pitch ing and rolling oscillation at high amplitude in low-speed wind tunnel . The re sults contain flow visualization in static and dynamic, pitching or rolling alo