Numerical investigation of influence of tip leakage flow on secondary flow in transonic centrifugal compressor at design condition

Kaneko, Masanao; Tsujita, Hoshio

doi:10.1007/s11630-015-0763-5

Cited by 19 publications

(12 citation statements)

References 5 publications

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“…The conclusions show that the flow structure has a considerable effect on the internal flow field [5][6][7]. Kaneko et al [8] and Robert et al [9] found by numerical simulation that the tip clearance could substantially change the internal flow pattern of the centrifugal impeller, which reduced the performance of the compressor and it was more obvious with large tip clearance. This conclusion was verified by the experiment [10].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

et al. 2019

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Tip leakage vortex has an important influence on the performance of semi-open centrifugal pumps. Simulations based on the three-dimensional Reynolds-Averaged Navier–Stokes were conducted to study the structural characteristics of tip leakage vortex and its effects on the internal flow field, and the Shear Stress Transport k-ω turbulence model was used to simulate the whole flow passage of centrifugal pumps with tip clearances of 0 mm and 1 mm. Then, the tip leakage vortex was analyzed using the relative vorticity transport equation. The numerical data and experimental results agreed well. The leakage vortex formed in the tip clearance led to 18.7% and 14.4% decrease in head and efficiency under design condition, respectively, and the bigger the flow rate, the fast the performance decreased. Tip leakage vortex formed at the leading edge of the blade moved along the suction surface. Whereas the tip leakage vortex formed near the middle of the blade extended to the pressure surface of the adjacent blade. This phenomenon deteriorated the flow field and induced passage vortex, thereby reducing the static pressure and blade load and changing the static pressure distribution law. The formation and development of leakage vortex could be attributed to the relative vortex stretching the term. The Coriolis force term could reflect the change of vorticity caused by leakage flow, and the viscous diffusion term served as the vorticity source.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

et al. 2019

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“…In particular, the magnitude of the inlet relative Mach number M rel;1s is strongly depend on the blade inducer-to-exducer radius ratio and inlet relative flow angle at the shroud. 2,8,9,37,38 A correlation shown in equation ( 16) can be used to demonstrate the effect of the blade inlet relative flow angle b 1 s and blade inducer-to-outlet radius ratio on the inlet relative Mach number. As shown in Figure 5 the blade inlet relative flow angle of 60 degree yields the minimum M rel;1s , whereas the inlet relative flow angle lower and higher than 60 degree results in a higher inlet relative Mach number.…”

Section: Three-dimensional Impeller Designmentioning

confidence: 99%

“…Overall, these recent studies on larger diameter transonic centrifugal compressors demonstrate an appreciable improvement in performance which is attracting the attention of the turbomachinery industry. 2,6,8,10 However, the development of a smaller size (<50 mm) transonic centrifugal compressors is hardly witnessed.…”

Section: Introductionmentioning

confidence: 99%

Design of a transonic centrifugal compressor for High-speed turbomachinery

Pakle

Jiang

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The paper presents a design of a small-scale centrifugal compressor to match the performance of up to 20% larger diameter compressor in order to meet the demands for a higher mass flow rate and wide operating range for turbocharging applications. This development considers the 44 mm diameter impeller design involving transonic blading and state-of-the-art blade features. In the course of design, the investigation on the inducer blade angle [Formula: see text] and blade inducer-to-outlet radius ratio has shown to have a dominant influence on the magnitude of inlet relative Mach number. Diffuser width and volute A/R ratio are also observed to be parameters affecting the overall performance of the compressor stage. Based on the diffuser parametric study, the most efficient diffuser width equal to 70% of the blade exducer width is observed. The performance of the present compressor stage is analyzed with computational fluid dynamics simulations and experimental tests. The comparison of the predicted and measured results of the 44 mm compressor stage shows a good agreement for overall performance. Besides, the 44 mm compressor stage having the most efficient diffuser width and enlarged volute A/R ratio shows a good overlap of performance with approximately 20% larger diameter (52 mm) compressor stage performance. This development demonstrates that the impeller with state-of-the-art design features are likely to contribute to enhancement of the compressor performance.

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“…Fig.1 shows Secondary flow streamlines in the impeller developed by Cumpsty. Numerical studies, including the one by Keneko [10], also showed and clarified this distribution of flow for the design and optimization of centrifugal compressors [11]. [8] Impeller optimization is an interesting research area.…”

Section: Introductionmentioning

confidence: 95%

Flow Simulation and Model Analysis of Efficiency and Pressure Ratio Behaviors in GT4086 Turbocharger Compressor

Omidi

2020

mech

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The present paper seeks to model and simulate the function of a centrifugal GT4082 compressor and evaluates the effects of losses in the impeller, volute, and diffuser. It is also examined the mass parameter effect on the efficiency drop at different speeds. The total and static pressure drops are also examined in the volute and diffuser. Based on the experiments, the efficiency drops in these parts modeled at different mass parameters and speeds discovered to be maximized in the volute and diffuser at a specific speed. A global minimum was observed in the overall pressure drop and a global maximum in the static pressure drop versus a mass parameter.

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Numerical investigation of influence of tip leakage flow on secondary flow in transonic centrifugal compressor at design condition

Cited by 19 publications

References 5 publications

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

Design of a transonic centrifugal compressor for High-speed turbomachinery

Flow Simulation and Model Analysis of Efficiency and Pressure Ratio Behaviors in GT4086 Turbocharger Compressor

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