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full-annulus simulation of the Surge Inception in a Transonic Centrifugal Compressor

Journal of Thermal Science 2015年第5期24卷 442-451页

作者： I.Trébinjac E.Benichou N.Buffaz Laboratoire de Mécanique des Fluides et d’Acoustique UMR CNRS 5509 Ecole Centrale de Lyon UCBLyon I INSA 36 av. Guy de Collongue 69134 Ecully Cedex France Turbomeca groupe Safran 64511 Bordes France

full annulus simulations of the flow which develops in a transonic centrifugal compressor are performed at two stable operating points （peak efficiency and near surge） and during the path to surge. At stable conditions, the flow field properties are analyzed by comparisons with experimental data and numerical simulations using a phase lagged approach previously carried out. Regarding the stage overall performance, an excellent agreement is obtained between the numerical results （both with time lagged approach and full-annulus calculation） and the ex- periments. From the full-annnlus simulations, the change in flow pattern from peak efficiency to surge is found to be perfectly similar to that obtained from the simulations using the time lagged approach. In particular, pro- vided that the operating point is stable, the flow proves to be chorochronic. The full-annulus simulations were continued after a unique small change in the throttle law applied at the exit of the numerical domain. The mass flow, pressure ratio and efficiency then significantly drop all the more the time progresses. The simulation becomes unstable and the surge inception well underway. The path to surge is found to be due to the enlargement of the boundary layer separation on the suction side of the diffuser vanes in accordance with the conclusions drawn from the chorochronic simulations and experiments. But as the time progresses, the flow loses its chorochronic character. Stall cells rotating at around 7% of the rotor speed develop and lead to surge in around 5 revolutions.

关键词： centrifugal compressor surge transonic rotating stall full-annulus simulation URANS

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