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本文以某1.5级轴流压气机为研究对象,采用三维数值模拟方法研究静叶轮毂间隙对压气机角区分离的控制,先从轮毂整体等间隙入手,然后发展到整体梯形间隙,再到部分间隙,最后提出尾缘间隙。结果表明,整体间隙可以吹除静叶根部的角区分离从而改善压气机低工况点的性能,但也付出了设计点性能下降的代价,并且整体梯形间隙优于整体等间隙。而对于轮毂部分间隙,随着间隙位置往尾缘方向移动,部分间隙控制角区分离的能力逐渐增强,设计点性能降低的程度逐渐减轻。最后,提出尾缘间隙,选择一定大小的尾缘间隙可以在基本不降低设计点性能的前提下使低工况点的流量增加0.88 kg/s、效率提高1.37%、压比提高0.15%。
In this paper, a 1.5-level axial compressor is taken as the research object. The three-dimensional numerical simulation method is used to study the control of the static impeller hub clearance on the compressor corner separation. First, the overall clearance of the hub is taken as a whole, then the overall trapezoidal clearance is developed, Gap, finally proposed trailing edge clearance. The results show that the overall clearance can separate the corner region of the root of the static impeller to improve the performance of the compressor at low operating conditions, but also at the expense of the performance degradation of the design point, and the overall trapezoidal clearance is better than the overall equal clearance. For the part of the hub, as the gap moves toward the trailing edge, the ability of the partial gap control corner to separate gradually increases and the performance of the design point decreases gradually. Finally, the trailing edge clearance is proposed. Choosing a certain size of trailing edge clearance can increase the flow rate of low working condition point by 0.88 kg / s and improve the efficiency by 1.37% and the pressure ratio by 0.15% without reducing the design point performance.