A Novel Approach to Evaluate the Benefits of Casing Treatment in Axial Compressors

Author:

Legras Guillaume1,Trébinjac Isabelle1ORCID,Gourdain Nicolas2ORCID,Ottavy Xavier1,Castillon Lionel3

Affiliation:

1. LMFA, UMR 5509, Ecole Centrale de Lyon, UCB Lyon I and INSA, 69134 Ecully, France

2. CERFACS, Computational Fluid Dynamics Team, 42 Avenue Gaspard Coriolis, 31057 Toulouse, France

3. ONERA, Applied Aerodynamics Department, 8 Rue des Vertugadins, 92190 Meudon, France

Abstract

Passive control devices based on casing treatments have already shown their capability to improve the flow stability in axial compressors. However, their optimization remains complex due to a partial understanding of the related physical mechanisms. In order to quantitatively assess the interaction between slots and the blade tip flow, the present paper develops a novel analysis methodology based on a control-volume approach located in the rotor tip region. This methodology may be used for analyzing the casing treatment based on both axi- and non-axisymmetric slots design. The second issue of the paper focuses on the application of the current approach to better understand the effects of axi- and non-axisymmetric grooves in three different axial compressors which differ by the flow regime (subsonic/transonic) and the smooth casing shape (cylindrical/concave). Numerical simulations are performed, and results of the current approach with and without casing treatments are compared.

Publisher

Hindawi Limited

Subject

Industrial and Manufacturing Engineering,Mechanical Engineering

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