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

页码：555 / 564

页数：10

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