Effects of volute’s asymmetry on the performance of a turbocharger centrifugal compressor

Zheng, Xinqian; Lin, Yun; Sun, Zhenzhong

doi:10.1177/0954410016670418

Cited by 11 publications

(6 citation statements)

References 29 publications

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“…Another work focused on the influence of the distortion amplitude, which showed that the higher the amplitude of the volute-induced distortion, the narrower the stable flow range. 20 The work of Zheng et al 21 provided theoretical evidence that proves the relationship between flow field distortion and compressor flow stability; a theoretical model taking the flow field distortion into account was established to explain the flow instability behavior of compressors, and it was noted that the flow field distortion caused flow instability at certain flow passages in advance, hence triggering the whole compressor to stall or surge at a higher mass flow rate, narrowing the stable flow range and exacerbating the compressor flow stability. Additionally, non-axisymmetric flow control methods, such as the non-axisymmetric casing treatment, 22, 23 were reported to be able to adapt the flow field distortion and extend the stable flow range, which also proves the belief that flow distortion is harmful to flow stability, to some extent.…”

Section: Volute-induced Distortion and Volute Designmentioning

confidence: 99%

Influence of volute design on flow field distortion and flow stability of turbocharger centrifugal compressors

Sun

Zheng

Linghu

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Volute-induced distortion of the flow field remarkably exacerbates the flow stability of turbocharger centrifugal compressors; hence, reducing the flow field distortion by modifying the volute design is of great significance. This study investigated the influence of volute design on the flow field distortion and flow stability of turbocharger centrifugal compressors. Volutes with different throat areas and different area-to-radius ratio ([Formula: see text]) distributions were designed, and their performances were analyzed via both numerical and experimental methods. The results show that the throat area and the [Formula: see text] distribution significantly influence the volute-induced pressure distortion. By modifying the volute design, the amplitude of the pressure distortion can be reduced from 8.82% to 3.22%, and the stable flow range can be extended from 49.8% to 58.7%. Additionally, to reduce flow field distortion, the throat area should be appropriate to guarantee a match between the volute and upstream components, and the [Formula: see text] distribution near the volute tongue should have a moderate slope. This study provides design methods for reducing flow field distortion by modifying the volute, and it also verifies the belief that smaller flow field distortion is beneficial to the flow stability of compressors.

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Section: Volute-induced Distortion and Volute Designmentioning

confidence: 99%

Influence of volute design on flow field distortion and flow stability of turbocharger centrifugal compressors

Sun

Zheng

Linghu

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

Self Cite

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“…18–21 Stall inception can occur first in the impeller inlet of the passage with the highest reverse pressure gradient. 22,23…”

Section: Introductionmentioning

confidence: 99%

“…[18][19][20][21] Stall inception can occur first in the impeller inlet of the passage with the highest reverse pressure gradient. 22,23 The compressor stall usually occurs in the tip separation flow region, which is related to the casing wall static pressure distribution (CWSP). Therefore, many experimental and calculation studies on the CWSP of centrifugal compressors, such as Tamaki et al, 24 Harley et al, 25 and Yang et al, 26 have been conducted in recent years.…”

Section: Introductionmentioning

confidence: 99%

Inhibition mechanism of static pressure circumferential double-peak distribution using a recirculation device for a centrifugal compressor

Yang

Zhang

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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The asymmetric volute structure in the turbocharger centrifugal compressor causes a static pressure circumferential double-peak distribution (PD-DP) at small flow rates and affects the circumferential stall position near the impeller inlet. In this study, a recirculation device was added to a prototype compressor, and the effect of the recirculation flow on the PD-DP was studied to reveal the difference in the PD-DP formation mechanism with and without the device. In addition, the influence of the PD-DP difference on the compressor flow stability was investigated. The results show that the PD-DP generated various pressure gradients between the front and rear slots of the recirculation device at different circumferential positions, resulting in a double-peak distribution in the recirculation flow rate. When the recirculation airflow flowed back into the impeller inlet, the two recirculation flow rate peaks were near the circumferential positions occupied by the two static pressure peaks in the prototype compressor. Therefore, the pressure distortion degree near the impeller inlet could be inhibited, weakening the difference in the deflection degree of the tip leakage flow (TLF) in each compressor passage. It should be noted that the circumferential positions with more prominent variation in the TLF corresponded to the passages with more serious flow deterioration in the prototype compressor, and the blockage of these passages near the inlet was reduced to a greater extent, which could better improve the flow stability of the compressor.

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“…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. [6][7][8] Recently, increasing researchers have focused on the influence of the downstream static pressure distortion induced by the volute on the centrifugal compressor stall. In fact, the volute is a type of gas collecting and guiding device.…”

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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Effects of volute’s asymmetry on the performance of a turbocharger centrifugal compressor

Cited by 11 publications

References 29 publications

Influence of volute design on flow field distortion and flow stability of turbocharger centrifugal compressors

Influence of volute design on flow field distortion and flow stability of turbocharger centrifugal compressors

Inhibition mechanism of static pressure circumferential double-peak distribution using a recirculation device for a centrifugal compressor

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

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