振荡叶栅气动性能实验研究(英文)

为了提供双凸翼型叶栅在所有叶间相位角及实际折合频率下高亚音和跨音定常和振荡气动性能的基本数据,在 NASA路易斯研究中心的跨音振荡叶栅试验设备上进行了一系列试验。为了进行该试验,研制出并使用了非定常气动影响系数法,即叶栅中一次只有一个翼型振荡,测出该振荡翼型与邻近静止翼型上非定常压力的矢量和,藉此就能确定在特定叶间相位角下相当于全部叶片振荡的叶栅的非定常气动性能。 

EXPERIMENTAL INVESTIGATION OF OSCILLATING CASCADE AERODYNAMICS

A series of experiments are performed in the NASA Lewis Transonic Oscillating Cascade Facility to provide fundamental data quantifying the high subsonic and transonic steady and oscillating aerodyna mics of a biconvex airfoil cascade at realistic reduced frequency values for all interblade phase angles.This is accomplished by developing and utilizing an unsteady aerodynamic influence coefficient technique in which only one cascaded airfoil is oscillated at a time.The vector summation of the resulting airfoil surface unsteady pressures measured on a dynamically instrumented airfoil enables the unsteady aerodynamics of an equivalent cascade with all airfoils oscillating at any specified interblade phase angle to be determined.