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Some Effects of Non-Axisymmetric End Wall Profiling on Axial Flow Compressor Aerodynamics. Part II: Multi-Stage HPC CFD Study

机译：非轴对称末端壁分析对轴向流动压缩机空气动力学的一些影响。第二部分：多阶段HPC CFD研究

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Non-axisymmetric end wall profiling is now a well established design methodology in axial flow turbines, used principally to improve their aerodynamic efficiency by reducing secondary loss. However, profiled end walls (PEWs) have yet to find an in-service application in a gas turbine compressor. This two-part paper presents the results of a number of studies, both experimental and computational, into the potential aerodynamic benefits of applying PEWs in axial flow compressors. The second paper describes an investigation into PEWs as a means of suppressing stator hub corner stall. An in-house design optimisation system (SOPHY) was applied to a typical embedded stator row in a multi-stage HP compressor. This enabled a new PEW geometry to be defined which is shown to be an effective alternative to 3-D aerofoil shaping in controlling stator hub corner stall. The results of this new study and of the work described in the first paper have been combined in a further investigation. PEWs were applied to an HPC with purely 2-D blading, which exhibited extensive stator hub comer stall at off-design conditions. CFD analysis showed that stator hub corner stall was successfully suppressed by the PEWs. It is concluded that PEWs can significantly affect the end wall flow field and have similar effects on corner stall as 3-D blading. The potential for improving the performance of axial flow compressors using PEWs is discussed. To successfully achieve any such improvements, extensive computational resources that are dedicated to design optimisation will be required.
机译：非轴对称端墙分析现在是轴流涡轮机中建立的设计方法，主要用于通过降低二次损失来提高它们的空气动力学效率。然而，成型端壁（PEWS）尚未在燃气轮机压缩机中找到适用于型号的应用。这篇两部分纸张呈现了许多研究的结果，既有实验和计算，也能够在轴流压缩机中施加PEW的潜在空气动力学益处。第二篇论文描述了对PEW的调查作为抑制定子枢纽角落的手段。内部设计优化系统（Sophy）应用于多级HP压缩机中的典型嵌入式定子排。这使得能够定义新的PEW几何形状，其被示出为控制定子毂角落摊位中的3-D空气织机的有效替代方案。这项新研究和第一篇论文中描述的工作的结果已在进一步的调查中结合。用纯2-D叶片将PEWS应用于HPC，其在非设计条件下展现了广泛的定子毂C选手档。 CFD分析表明，定子轮毂角落档位被PEW成功抑制。得出结论，PEWS可以显着影响端壁流场，对角落失速具有类似的效果作为3-D叶片。讨论了改善使用PEWS的轴流压缩机性能的可能性。为了成功实现任何此类改进，将需要广泛的计算资源，以设计优化。

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