Hybrid RANS/LES study of complex turbulence characteristics and flow mechanisms on the highly-loaded turbine endwall

Bian, Xiutao; Wang, Qingsong; Chen, Ziyu; Yuan, Xin

doi:10.1016/j.ast.2019.105404

Cited by 23 publications

(1 citation statement)

References 44 publications

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“…The total number of grid points for the single passage model is over 26 million. A literature survey 16,17 shows that the highly accurate simulation is often conducted on a single passage model and the grid nodes usually range from 20 million to 40 million for a single passage.…”

Section: Numerical Schemementioning

confidence: 99%

DES analysis on effects of variable geometry inlet orifice on a centrifugal compressor

Liu

Zhao

Song

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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A variable geometry inlet configuration can improve the off-design aerodynamic performance of a turbocharger compressor by actively modulating the internal flow field. As the core part of the configuration, the variable geometry orifice is arranged in front of the compressor inducer. Its novelty is to actively regulate the compressor inlet flow area at an off-design point without causing significant impact at the design point. In this paper, the effects of the orifice on compressor performance and internal flow field are investigated using experiments and numerical simulations. The experimental and the numerical results confirm the variable inlet configuration to be a promising method for extending the compressor operation range. The DES calculations reveal incidence angle reduction at inducer inlet, shock wave migration to a lower radius from blade tip, formation of the aft-loaded impeller, reduced difference between jet and wake flows at impeller exit, and turbulent flow enhancement in the diffuser. Based on understanding the orifice’s effects on the centrifugal compressor, a design suggestion is proposed for the variable geometry compressor of this sort.

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Section: Numerical Schemementioning

confidence: 99%