Three-dimensional viscous flow simulation in a backswept centrifugal impeller at the design point

Zhang, Mou-Jin; Pomfret, Mike; Wong, Chi Man

doi:10.1016/0045-7930(96)00008-4

Cited by 22 publications

(10 citation statements)

References 16 publications

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“…For three dimensional problem, Zhang et al [25,26], by solving the Navies-Stokes equations coupled with the standard two-equation k-ε turbulence model and their results compared well with those experimental study. He and Sato [27] also developed a three dimensional incompressible viscous flow solver and obtained satisfactory agreement with well established experimental data.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Cheah¹,

Lee²,

Winoto³

2011

International Journal of Fluid Machinery and Systems

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An unsteady numerical analysis has been carried out to study the strong impeller volute interaction of a centrifugal pump with six backward swept blades shrouded impeller. The numerical analysis is done by solving the threedimensional Reynolds Averaged Navier-Stokes codes with standard k-ε two-equations turbulence model and wall regions are modeled with a scalable log-law wall function. The flow within the impeller passage is very smooth and following the curvature of the blade in stream-wise direction. However, the analysis shows that there is a recirculation zone near the leading edge even at design point. When the flow is discharged into volute casing circumferentially from the impeller outlet, the high velocity flow is severely distorted and formed a spiraling vortex flow within the volute casing. A spatial and temporal wake flow core development is captured dynamically and shows how the wake core diffuses. Near volute tongue region, the impeller/volute tongue strong interaction is observed based on the periodically fluctuating pressure at outlet. The results of existing analysis also proved that the pressure fluctuation periodically is due to the position of impeller blade relative to tongue.

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Section: Introductionmentioning

confidence: 99%

Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Cheah¹,

Lee²,

Winoto³

2011

International Journal of Fluid Machinery and Systems

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“…The jet-flow, seen at the exit of the impeller, was observed to comprise two parts: a low-momentum region near the suction surface/shroud corner with high turbulence values and losses and a jet region characterized by a high tangential velocity component near the pressure side with a relatively stable flow and low pressure losses. Hathaway et al [2] and Zhang et al [3] simulated the flow in an unshrouded compressor and failed to predict the size and the origin of the wake with Reynolds-averaged Navier-Stokes (RANS) models accurately. Recently, large-eddy simulation (LES) has been employed as an alternative research tool for turbomachinery flows.…”

Section: Introductionmentioning

confidence: 98%

Large‐eddy simulation of the flow in a low‐speed centrifugal compressor

Guleren

Turan

Pınarbaşı

2008

Numerical Methods in Fluids

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SUMMARYThe results of a series of numerical simulations for the NASA low-speed centrifugal compressor are presented. Large-eddy simulation (LES) is carried out together with the most commonly used Reynoldsaveraged Navier-Stokes (RANS) models, including the mixing length, k-and k-models. Predictions are compared with the available experimental data. It is seen that quantitative predictions of LES are better than those of RANS models for the tip jet and wake regions. LES, unlike these RANS models and the past computational fluid dynamics predictions, shows separation near the casing starting around the halfway of the impeller and reveals a vortex bubble close the impeller exit/casing corner. The tip leakage flow, which is the main characteristic of an unshrouded compressor, is investigated using the probability density function (PDF) and the power spectral density (PSD) of the instantaneous velocity values. The skewness and flatness calculated from the PDF profiles show that the unsteady flow in the tip wake region is less-intermittent compared with the flow in the tip jet region. The PSD analysis shows that the turbulent energy transfer rate from the larger scales to the smaller scales and the frequency range where the inertial region is valid increase in the tip wake region.

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“…The numerical simulation is calculated by CFX software, and the standard k-ε model is used as a turbulent model. This model has been successfully applied in many types of fluid machinery, which proves that the standard k-ε model can predict the performance and the velocity and pressure distribution of centrifugal fan [8,9].…”

Section: Advances In Engineering Research (Aer) Volume 102mentioning

confidence: 99%

Numerical investigation on the effect of inlet acceleration on inlet flow distortion in a centrifugal fan

Wang¹,

Dong²,

Liu³

2017

Proceedings of the Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017)

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Abstract. Centrifugal fan is most widely used as an important component in ventilation system. The performance of centrifugal fan is sensitive to the inlet environment; therefore inlet flow distortion is one of the most attention problems. Numerical investigation has been carried out for the comparison of two kinds of inlet, one is standard straight duct and the other is a 90°curved duct. The results show that the distortion of inlet will seriously affect the impeller. Based on the theory of internal flow, a reasonable pressure gradient is added between the impeller and the curved duct, which is caused by inlet accelerator. Numerical simulation results show that acceleration can effectively suppress the inlet flow distortion; meanwhile it cannot affect the regular work of impeller.

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Three-dimensional viscous flow simulation in a backswept centrifugal impeller at the design point

Cited by 22 publications

References 16 publications

Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Unsteady Analysis of Impeller-Volute Interaction in Centrifugal Pump

Large‐eddy simulation of the flow in a low‐speed centrifugal compressor

Numerical investigation on the effect of inlet acceleration on inlet flow distortion in a centrifugal fan

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