Investigation of the instability mechanisms in a turbocharger centrifugal compressor with a vaneless diffuser by means of unsteady simulations

Zheng, Xinqian; Liu, Anxiong; Sun, Zhenzhong

doi:10.1177/0954407016677435

Cited by 8 publications

(5 citation statements)

References 45 publications

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“…The maximum aspect ratio of cells is less than 900. Some researchers 6,14,15 reported that for a centrifugal compressor of this sort, about 7 million grid points are sufficient for a RANS simulation, thus supporting the effectiveness of the 20 million.…”

Section: Computational Meshmentioning

confidence: 97%

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: Computational Meshmentioning

confidence: 97%

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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show abstract

“…The generation mechanism for the rotating stall and surge of a centrifugal compressor was analyzed by Sundström et al [6]. In addition, several researchers have analyzed the mechanism with a variable vaned diffuser [7] and with a vaneless diffuser [8], and the acoustic signature [9] has been studied as well.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of Surge Behavior in a Boil-Off Gas Centrifugal Compressor on an LNG Carrier

2022

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In this study, we conducted experiments and numerical analysis on a 270 kW industrial-scale centrifugal compressor used in the fuel supply system of an LNG carrier in order to improve the lumped-parameter surge model by considering the viscosity in the pipeline and to confirm whether the improved model would be applicable. The steady and unsteady compressor performance curves were constructed using measurements and predictions, respectively. The flow through the pipeline was assumed to be both steady and unsteady, and each governing equation under the assumptions was derived in accordance with the lumped-parameter model. In the steady flow case, the surge behavior of the modified model was in a good agreement with the lumped-parameter model at surge parameter B = 4.8716. In the unsteady flow case, however, the modified model showed a deviation from the lumped-parameter model, and the simulation from the modified model described the surge behavior 5% more accurately than the lumped-parameter model. Through experiments and numerical analysis, this study showed that the present models are useful and applicable for describing the surge behavior of an industrial-scale single-stage centrifugal compressor.

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“…However, as an important component of turbocharger, the stable-flow range of a compressor is predominantly limited by surge and stall, which seriously limits the performance of turbocharger. 5 The centrifugal compressor consists mainly of the impeller, diffuser, and volute. As an asymmetric geometry component, the volute leads to the formation of a circumferentially non-uniform flow field in the compressor and seriously affects the performance and stability of the compressor.…”

Section: Introductionmentioning

confidence: 99%

Formation mechanism of static pressure circumferential double-peak distribution in a centrifugal compressor under the action of downstream boundary

Yang

Zhang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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In the centrifugal compressor applied in the automobile turbochargers, the asymmetric structure of volute causes the non-uniform flow field in the impeller and compressor stall. The non-uniformity of the flow field in the compressor can be reflected by the casing-wall static pressure distribution. In this study, by removing the volute and directly imposing different simplified static pressure boundary conditions at the diffuser outlet, the formation mechanism of casing-wall static pressure circumferential double-peak distribution of the compressor is explored. It is found that the mass flow rate is redistributed at the impeller outlet due to local high static pressure induced by the volute tongue, which results in the formation of two airflow regions with high velocity in the diffuser, ultimately leading to the static pressure circumferential double-peak distribution in the diffuser and the impeller. Noted that because of the existence of the blades, the airflow regions with high and low velocity formed in the diffuser are locked within a limited range of one or more widths of the blade passage. When the number of blades in the compressor is large, the static pressure can appear as multi-peak distribution in the circumferential direction. Moreover, the result of the mass flow rate redistribution at the impeller outlet is determined by the static pressure distribution characteristics at the diffuser outlet.

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Investigation of the instability mechanisms in a turbocharger centrifugal compressor with a vaneless diffuser by means of unsteady simulations

Cited by 8 publications

References 45 publications

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

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

Experimental and Theoretical Study of Surge Behavior in a Boil-Off Gas Centrifugal Compressor on an LNG Carrier

Formation mechanism of static pressure circumferential double-peak distribution in a centrifugal compressor under the action of downstream boundary

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