Profiled End Wall (PEW) is an effective method that has been employed in recent years in the field of axial flow turbines as a means to reduce secondary flows and associated losses leading to improved efficiency. However, the application of end wall contouring to control the flow field in the radial vaned diffuser of a centrifugal compressor is new and no previous research has been found for this topic. The centrifugal compressor is the most extensively produced type of high-speed turbomachine and is therefore very important for power and propulsion applications. In order to reveal the impact of PEW on the performance and working range of centrifugal compressors, this study reports the outcomes of numerical simulations that were conducted for different PEW treatments and benchmarked against experimental data from the exemplar open test case known as ‘Radiver’. The results show the potential for the compressor operating range to be significantly extended by up to 39% in PEW cases with no significant decrease in efficiency or pressure ratio.

异型端壁（PEW）是近年来在轴流式涡轮机领域中采用的一种有效方法，可作为减少次级流量和相关损失从而提高效率的一种手段。然而，端壁轮廓控制离心压缩机的径向叶片式扩散器中的流场的应用是新的，并且尚未找到关于该主题的先前研究。离心式压缩机是生产最广泛的高速涡轮机类型，因此对于动力和推进应用非常重要。为了揭示PEW对离心压缩机的性能和工作范围的影响，这项研究报告了针对不同PEW处理进行的数值模拟的结果，并以来自示例性开放测试案例“ Radiver”的实验数据为基准。结果表明，在PEW情况下，压缩机的工作范围有可能显着扩大达39％，而效率或压力比没有明显下降。