Numerical Investigations of Slip Phenomena in Centrifugal Compressor Impellers

Huang, Jeng-Min; Luo, Kaiwei; Chen, Ching-Fu; Chiang, Chung-Ping; Wu, Tong; Chen, Chun‐Han

doi:10.1515/tjj-2012-0021

Cited by 6 publications

(8 citation statements)

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“…Recently, Slip factor is increasingly estimated by using CFD approach [18][19][20][21][22]. Thus it is necessary to explore effects of viscosity and flow rate on slip factor when a centrifugal pump handles viscous oils.…”

Section: Introductionmentioning

confidence: 99%

Effects of Flow Rate and Viscosity on Slip Factor of Centrifugal Pump Handling Viscous Oils

2013

International Journal of Rotating Machinery

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Slip factor is an important parameter in the hydraulic design of centrifugal pump impeller for handling viscous oils. How to extract the factor from CFD computational results and how flow rate and liquid viscosity to affect it remain unclear. In the present paper, the flip factor was estimated by means of two approaches: one is from the velocity triangles at the impeller outlet and the other is due to the impeller theoretical head of 3D turbulent viscous fluid. The velocity of water and viscous oils in the impeller and volute computed by CFD was validated with LDV measurements at the best efficiency point. The effect of exit blade angle on slip factor was clarified. It was shown that the two approaches result into two different slip factors. The factors are significantly dependent of flow rate; however, the liquid viscosity seems to take less effect on them. Volute is responsible for reduction in tangential velocity of liquid at the outlet of impeller at low flow rates. The slip factor of impeller with large exit blade angle is not sensitive to flow rate.

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Section: Introductionmentioning

confidence: 99%

Effects of Flow Rate and Viscosity on Slip Factor of Centrifugal Pump Handling Viscous Oils

2013

International Journal of Rotating Machinery

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“…Some newer researches of the slip phenomenon in centrifugal impellers mainly investigated pumps [15,16]. In these studies parameters such as flow rate, rotational speed, impeller exit angle, radius ratio and blade geometry have been considered for evaluating the slip factor [17,18].…”

Section: -Introductionmentioning

confidence: 99%

“…In Hung and Lou, considered effects of design parameters on the slip phenomenon in a centrifugal compressor [16]. They showed that more detailed studies on the slip phenomenon are required because there are several unanswered questions about it.…”

Section: -Introductionmentioning

confidence: 99%

Theoretical and experimental investigation of design parameter effects on the slip phenomenon and performance of a centrifugal compressor

2020

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There are many pieces of research about driving equations for prediction of the slip factor in centrifugal compressors. Inevitably, some simplifications have been imposed by them on the flow field characteristics and effects of many parameters have been neglected. In this research slip phenomenon is investigated experimentally and numerically in a specific centrifugal compressor with complex blade curves and splitter blades considering the main effective parameters like number of blades, exit angle, etc. Threedimensional simulation of the compressor viscus flow field with suitable turbulence method is performed. Experimental work is carried out at several rotational speeds and mass flow rates slip factor. Effects of main parameters such as rotational speed, mass flow rate, blade number, blade exit angle, diffuser design and tip clearance on slip phenomenon are studied. A variation of performance parameters such as pressure ratio and isentropic efficiency with slip factor are investigated, as well. It is observed that slip factor increases, as rotational speed and flow rate increase. Also changing the blade number from 6 to 9 in constant rotational speed and mass flow rate, causes 27 percent increase in slip factor.

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“…Recently, some researchers tried to predict slip factor using CFD. [13][14][15] Guo and Kim 16 developed an improved slip model for forward-curved blades centrifugal fan. He used numerical calculations to validate his model.…”

Section: Introductionmentioning

confidence: 99%

Improving slip factor prediction for centrifugal pumps using artificial neural networks

Ghaderi

Najafi

Nourbakhsh

2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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Slip factor is an important parameter in the performance prediction of centrifugal pumps. This paper presents a new approach improving slip factor estimation of centrifugal pumps. In order to understand the effects of geometrical parameters of impeller (i.e. blade number, blade outlet angle, radius ratio, and blade turning rate) on slip factor, a set of computational fluid dynamics based analyses were carried out for over 70 different impellers by means of a commercial code, CFX. The numerical model was validated with the available experimental data. Subsequently, a multilayer feed-forward neural network, as a popular neural network based fitting tool, was used to generate a mapping between blade geometrical parameters as input variables and slip factor as output variable. The ANN (i.e. artificial neural network) model generalization capability was assessed by comparing the network predictions with those calculated from the test data. The comparative assessment of different slip models showed that the neural network model has succeeded in improving the accuracy of previous slip factor models for centrifugal pumps.

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Numerical Investigations of Slip Phenomena in Centrifugal Compressor Impellers

Cited by 6 publications

References 0 publications

Effects of Flow Rate and Viscosity on Slip Factor of Centrifugal Pump Handling Viscous Oils

Effects of Flow Rate and Viscosity on Slip Factor of Centrifugal Pump Handling Viscous Oils

Theoretical and experimental investigation of design parameter effects on the slip phenomenon and performance of a centrifugal compressor

Improving slip factor prediction for centrifugal pumps using artificial neural networks

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