Temporal Behaviour of a Corner Separation in a Radial Vaned Diffuser of a Centrifugal Compressor Operating near Surge

被引：14
作者：
Marsan, A. [1 ]
Trebinjac, I. [1 ]
Coste, S. [2 ]
Leroy, G. [2 ]
机构：
[1] Ecole Cent Lyon, CNRS, UMR 5509, Lab Mecan Fluides & Acoust, F-69134 Ecully, France
[2] Turbomeca, Safran Grp, F-64511 Bordes, France
来源：
JOURNAL OF THERMAL SCIENCE | 2013年 / 22卷 / 06期
关键词：
Corner Separation; Radial Vaned Diffuser; Centrifugal Compressor; Surge;
D O I：
10.1007/s11630-013-0662-6
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The temporal behaviour of a flow separation in the hub-suction side corner of a transonic diffuser is studied thanks to unsteady numerical simulations based on the phase-lagged approach. The validity of the numerical results is confirmed by comparison with experimental unsteady pressure measurements. An analysis of the instantaneous skin-friction pattern and particles trajectories is presented. It highlights the topology of the separation and its temporal behaviour. The major result is that, despite of a highly time-dependent core flow, the separation is found to be a "fixed unsteady separation" characterized by a fixed location of the main saddle of the separation but an extent of the stall region modulated by the pressure waves induced by the impeller-diffuser interaction.
引用
收藏
页码：555 / 564
页数：10
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