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An experimental and analytical investigation of isolated rotor flap-lag stability in forward flight

机译:向前飞行中孤立转子襟翼滞后稳定性的实验和分析研究

摘要

For flap-lag stability of isolated rotors, experimental and analytical investigations are conducted in hover and forward flight on the adequacy of a linear quasisteady aerodynamics theory with dynamic inflow. Forward flight effects on lag regressing mode are emphasized. A soft inplane hingeless rotor with three blades is tested at advance ratios as high as 0.55 and at shaft angles as high as 20 degrees. In combination with lag natural frequencies, collective pitch settings and flap-lag coupling parameters, the data base comprises nearly 1200 test points (damping and frequency) in forward flight and 200 test points in hover. By computerized symbolic manipulations, an analytic model is developed in substall to predict stability margins with mode identification. It also predicts substall and stall regions to help explain the correlation between theory and data.
机译:对于隔离转子的襟翼滞后稳定性,我们在线性和动态进气线性拟稳态空气动力学理论的适用性基础上,进行了悬停和前向飞行的实验和分析研究。强调了滞后回归模式的前向飞行效果。具有三个叶片的软平面无铰链转子在高达0.55的提前比和高达20度的轴角下进行了测试。结合滞后固有频率,集体螺距设置和襟翼滞后耦合参数,该数据库包括向前飞行中的近1200个测试点(阻尼和频率)和悬停时的200个测试点。通过计算机化的符号操作,可以在不充分的情况下开发一种分析模型,以通过模式识别来预测稳定性裕度。它还预测了失速和失速区域,以帮助解释理论与数据之间的相关性。

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