Influence of vaned diffuser on the potential effect of volute and stall inception of centrifugal compressor

Fu, Li; Yang, Ce; Zhang, Hang; Bao, Wenrui; Zhang, Hanzhi

doi:10.1177/0954407020916562

Cited by 7 publications

(7 citation statements)

References 48 publications

(56 reference statements)

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“…Once one of these two phenomena was observed, the operating point was considered as stall and the previous converged mass flow rate was determined to be the compressor stall limit. 27 For the requirements of Spalart-Allmaras turbulence model, the value of inlet turbulent viscosity was set to 1e À04 m 2 /s, Fu et al 16 researched the same centrifugal compressor and proved that 1e À04 m 2 /s was suitable. All of the solid walls were assumed to be non-slip and adiabatic.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…13 The study of Yang et al 14 and Su et al 15 showed that the volute could determine both the static pressure distribution on the casing wall and the circumferential position of stall inception. Moreover, Fu et al 16 investigated the same centrifugal compressor with vaned/vaneless diffuser and found that the vaned diffuser reduces the potential effect of volute but could not eliminate the "locking effect" of stall inception. Nevertheless, for a turbocharger centrifugal compressor with high pressure ratio, the use of variable diffuser vanes could extend the stable operating range with an acceptable decline of aerodynamic performance, according to the study of Zheng.…”

Section: Introductionmentioning

confidence: 99%

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Effect of bend-induced inlet distortion on a centrifugal compressor performance and stall inception

Wang

Zhao

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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Bend pipes are usually installed upstream of a centrifugal compressor because of spatial constraints. With the interaction between radial pressure gradient and centrifugal force in bend pipe, a pair of counter-rotating vortices (Dean vortices) is formed after the fluids passed through the bend, and the shape of Dean vortices keeps changing in the straight pipe between the bend and compressor. The effects of the changed Dean vortices on the aerodynamic performance and stall inception of a centrifugal compressor are investigated with an experimentally validated numerical method based on four models, in which the distance of the straight pipe located between the bend and the compressor varies from 0D to 1D through 1/4D and 1/2D. The results show that as the straight pipe length increases from 0D to 1D, both the total pressure deficit at compressor inlet and the flow separations at inlet pipe symmetry plane are enlarged, and the mass flow rate distribution of full-annulus become more fluctuant. As a consequence, the compressor aerodynamic performance degrades and its maximum flow capacity decreases. More importantly, bend-induced inlet distortion has the effect of inducing/suppressing impeller stall inception, it depends on the location and intensity of swirl distortion and total pressure distortion. The low total pressure region located at impeller tip leads to reversed flow and stall inception, while the positive pre-swirl component in swirl distortion decreases the incidence and suppresses stall inception. These results provide a reference for the design of upstream inlet curved pipes of centrifugal compressors.

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Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of bend-induced inlet distortion on a centrifugal compressor performance and stall inception

Wang

Zhao

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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show abstract

“…31,32 Moreover, adding vanes with large stagger angles in the vaneless diffuser can weaken the potential interference of the volute to the upstream flow field and delay the compressor stall. 33 The essence of the above methods is to control the source of the pressure distortion. Suppose the pressure wave with circumferential distortion generated downstream can be cut off inside the impeller.…”

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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“…9,10 Many studies have proved that the volute causes flow field distortion in the diffuser, and this distortion propagates reversely in the diffuser and the impeller, which causes flow field distortion at the impeller inlet and induces the compressor stall. [11][12][13] The distribution of non-uniform flow field in the compressor can be reflected by evenly arranging static pressure probes in the circumferential direction to measure the static pressure distribution on the casing wall of the compressor. For a centrifugal compressor with volute applied in automobile turbocharger, Yang and Zhang [14][15][16] analyzed the casing-wall static pressure distribution under different rotational speeds and different operating conditions through experiments and calculations to understand its stall mechanism.…”

Section: Introductionmentioning

confidence: 99%

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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Influence of vaned diffuser on the potential effect of volute and stall inception of centrifugal compressor

Cited by 7 publications

References 48 publications

Effect of bend-induced inlet distortion on a centrifugal compressor performance and stall inception

Effect of bend-induced inlet distortion on a centrifugal compressor performance and stall inception

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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