基于实测扭转度误差对叶片气动合格性探讨

In the machining process, it is inevitable to produce out-of-tolerance blades. To study the aerodynamic qualification, the transonic blade Rotor37 was taken as the study object. Firstly, the machining tolerance [−0.5^◦, +0.5^◦] was added to the nominal blade, and the qualified range of aerodynamic performance was determined by the numerical simulation, whose change law was analyzed. Then, based on the measured twist angle error mean and standard deviation, machining qualified and out-of-tolerance blades were created, whose aerodynamic qualification was summarized. The results show that the blade characteristic curve shift as a whole owing to the influence of twist angle error. Therefore, when the stability margin is measured under the premise of selecting the parameters under the near stall and peak efficiency conditions, the stability margin of the “under-deflection” blades decreases, while that of the “over-deflection” blades increases. Taking the machining tolerance as a reference, the flow area and angle of attack of the blade in the out-of-tolerance and non-out-of-tolerance area have opposite trend, i.e., the influence of these two areas in the blade performance has an offsetting effect, so that there is a situation where the out-of-tolerance blade is aerodynamically qualified.