Inducer Design to Avoid Cavitation Instabilities

Kang, Donghyuk; Watanabe, Toshifumi; Yonezawa, Koichi; Horiguchi, Hironori; Kawata, Yutaka; Tsujimoto, Yoshinobu

doi:10.1063/1.3464890

Cited by 10 publications

(9 citation statements)

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“…This also suggests that cavitation instabilities can be avoided by avoiding the interaction of the tip cavity with the next blade. Actually several stable inducers could be designed based on this design guideline [5]. 1.0U t 1.0U t 1.0U t 1.0U t 0.1U t 0.1U t…”

Section: Resultsmentioning

confidence: 99%

Cause of Cavitation Instabilities in Three Dimensional Inducer

Kang¹,

Yonezawa²,

Horiguchi³

et al. 2009

International Journal of Fluid Machinery and Systems

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Alternate blade cavitation, rotating cavitation and cavitation surge in rocket turbopump inducers were simulated by a three dimensional commercial CFD code. In order to clarify the cause of cavitation instabilities, the velocity disturbance caused by cavitation was obtained by subtracting the velocity vector under non-cavitating condition from that under cavitating condition. It was found that there exists a disturbance flow towards the trailing edge of the tip cavity. This flow has an axial flow component towards downstream which reduces the incidence angle to the next blade. It was found that all of the cavitation instabilities start to occur when this flow starts to interact with the leading edge of the next blade. The existence of the disturbance flow was validated by experiments.

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Section: Resultsmentioning

confidence: 99%

Cause of Cavitation Instabilities in Three Dimensional Inducer

Kang¹,

Yonezawa²,

Horiguchi³

et al. 2009

International Journal of Fluid Machinery and Systems

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“…3, where ϕ=C z /U t =Q /A i U t is the flow coefficient based on the mean axial velocity C z , at z=0. The closed type cavitation tunnel was used for measurement [12]. The difference between the predictions using the steady and the unsteady calculations is small.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of Dynamic Transfer Matrix and Unsteady Cavitation Characteristics of an Inducer

Yonezawa¹,

Aono²,

Kang³

et al. 2012

International Journal of Fluid Machinery and Systems

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The transfer matrix and unsteady cavitation characteristics, cavitation compliance and mass flow gain factor, of cavitating inducer were evaluated by CFD using commercial software. Quasi-steady values of cavitation compliance and mass flow gain factor were obtained first by using steady calculations at various flow rate and inlet cavitation number. Then unsteady calculations were made to determine the transfer matrix and the cavitation characteristics. The results are compared with experiments to show the validity of calculations.

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“…The effects of the backflow vortex cavitation was analysed by Yamamoto and Tsujimoto [26]. Also cavitation in turbopump inducers has been investigated in various studies [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Effects of Volute Throat Enlargement and Fluid Viscosity on the Performance of an Over Hung Centrifugal Pump

Khoeini¹,

Riasi

Shahmoradi³

2017

IJFMS

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In the current study, identifying regimes and behaviors of the various viscous fluids in a typical horizontal singlestage centrifugal pump and improving its performance by enhancing volute throat area have been surveyed numerically and experimentally. Indeed the initial pump had insufficient head at BEP (Best Efficient Point) in relevant applications. In order to solve this problem, the method of increasing the volute throat area on the prototype was used in steps and eventually the increased head values have been achieved. Then modified centrifugal pump, that has been constructed based on the modified control volume from numerical results, has been tested thoroughly. The maximum head and efficiency discrepancy between numerical and experimental results in BEP were 1.4 and 2.6% respectively. The effects of viscous fluids, from 1 cSt to 500 cSt, on the performance curves of centrifugal pump have been investigated as well and results showed that viscous fluids has significant effect on them. Indeed the highest head and efficiency in the same conditions at BEP has been obtained in viscosity 1 cst which was by 19.2% and 44% greater than the viscosity 500 cSt. It is also found that the highest viscous fluid had the highest energy consumption as the absorbed power of highest viscous fluid, 500 cSt, increased up to approximately 55% above the lowest viscous fluid, 1 cSt, values.

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Inducer Design to Avoid Cavitation Instabilities

Cited by 10 publications

References 0 publications

Cause of Cavitation Instabilities in Three Dimensional Inducer

Cause of Cavitation Instabilities in Three Dimensional Inducer

Numerical Evaluation of Dynamic Transfer Matrix and Unsteady Cavitation Characteristics of an Inducer

Effects of Volute Throat Enlargement and Fluid Viscosity on the Performance of an Over Hung Centrifugal Pump

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