Control of three-dimensional separations in axial compressors by tailored boundary layer suction
Control of three-dimensional separations in axial compressors by tailored boundary layer suction
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DOI：
10.1115/1.2749294
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发表时间：
2008-01-01
影响因子：
1.7
通讯作者：
Hynes, Tom P.
中科院分区：
文献类型：
--
作者：
Gbadebo, Semiu A.;Cull, Nicholas A.;Hynes, Tom P.
改善叶轮机械压气机性能的重要途径之一是控制叶片通道吸力面和端壁角形成的三维分离。基于对这些分离形成的认识，本文阐述了在一定的工作攻角范围内，适当应用高达进口质量流量0.7%的附面层吸力是如何控制和消除典型的压气机定子轮毂转角三维分离的。本文用计算流体力学的方法描述了吸力在叶片吸力面和端壁边界层上的应用，并举例说明了端壁分离流线在叶片通道内引发三维分离中的影响。在压气机叶栅中的实验研究证实了分离区域从叶片吸力面的去除，包括表面流动显示、表面静压和出口损失测量。随之而来的通道流场的特点是叶片负荷增加(压力和吸力面之间的静压差)，平均静压升高，显著的损失消除和均匀的出口流动。这一结果也使得能够评估3D分离对总体损失和通道堵塞的贡献。
One of the important ways of improving turbomachinery compressor performance is to control three-dimensional (3D) separations, which form over the suction surface and end wall corner of the blade passage. Based on the insights gained into the formation of these separations, this paper illustrates how an appropriately applied boundary layer-suction of up to 0.7% of inlet mass flow can control and eliminate typical compressor stator hub corner 3D separation over a range of operating incidence. The paper describes, using computational fluid dynamics, the application of suction on the blade suction surface and end wall boundary layers and exemplifies the influence of end wall dividing streamline in initiating 3D separation in the blade passage. The removal of the separated region from the blade suction surface is confirmed by an experimental investigation in a compressor cascade involving surface flow visualization, surface static pressure, and exit loss measurements. The ensuing passage flow field is characterized by increased blade loading (static pressure difference between pressure and suction surface), enhanced average static pressure rise, significant loss removal, and a uniform exit flow. This result also enables the contribution of the 3D separation to the overall loss and passage blockage to be assessed.