超高负荷串列转子尖部流场结构的实验和数值研究

Front/rear tip leakage flow and front blade wake flow exist in the tandem rotor, and the flow structure is relatively complex. It is the key to analyze the flow field to accurately judge the interaction between these flows. In this paper, the tip flow field of the highly loaded tandem rotors designed by Beihang university LSLSAC is studied by experimental and numerical simulation methods. The results show that: For the tandem rotor studied in this article, both at the DE and NS, the tip leakage vortex of the front blade has reached the vicinity of the pressure surface of the front blade in the front blade exits, and close to the suction surface of the rear blade from the throat into the channel, The vortex characteristics of tip leakage vortex are enhanced under the effect of the favorable pressure gradient in the throat, and the relatively weak tip leakage vortex of the rear blade is absorbed in the rear blade channel. Compared with the conventional rotor, the stable development stage of tip leakage vortex in the tandem rotor is prolonged due to the effect of the favorable pressure gradient in the throat, which is beneficial to reduce the flow blockage at the rotor tip caused by the tip leakage vortex.