Numerical simulation of leading edge cavitation within the whole flow passage of a centrifugal pump

Li, Xiaojun; Yuan, Shouqi; Pan, Zhenhua; Yuan, Jianping; Fu, Ying-Shuang

doi:10.1007/s11431-013-5311-5

Cited by 48 publications

(26 citation statements)

References 15 publications

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“…It has been observed from figure 5. that the effect of stall is less pronounced for low pressure ratio [20,21]. Hence, the inducer with sweep operates stably well down to about 60% of the design flow coefficient and could avoid circulatory flow due to vortex that may lead to cavitate surfaces.…”

Section: Comparison Between Different Performance Characteristic Curvmentioning

confidence: 99%

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Effect of leading edge sweep on the performance of cavitating inducer of LOX booster turbopump used in semicryogenic engine

Mishra

Ghosh

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. As a part of the developmental effort towards the realization of a staged combustion cycle based liquid rocket engine, a program on simulation of the LOX booster pump for performance characterization has been taken up. Earlier reported work shows that the pump inducer works satisfactorily under cavitating conditions for the throttling range varying from 90% to 113%. However stall occurs below 90% of the designed flow rate which is to be strongly associated with the inlet backflow vortices due to flow separation [1]. It is envisaged that leading edge sweep may help in to controls the incipience and growth of the backflow vortices at the inlet leading edge tip of axial flow inducer leading to a wider operating range. In this paper, steady state 3D CFD analysis of rotating inducer is performed to examine the effect of leading edge sweep on the performance of axial flow LOX pump inducer using ANSYS ® CFX and has been compared with the performance of the inducer reported by Mishra and Ghosh [1]. IntroductionThe primary constraint on space enterprises is the high cost of escaping Earth's gravity. Therefore, for manned space mission and deep space probes, reusable launch vehicles are contemplated to be used. One of the technological options towards this endeavour is a semicryogenic engine based on high pressure, oxygen rich, staged combustion cycle with LOX and hydrocarbon fuel [2].For high thrust, a mission with high specific impulse, a turbopump propellant feed system offers overall weight reduction, high power to weight ratio with increased payload capacity. This turbopump feed system has at least on booster pump to ensure cavitation free operation at the main pump inlet. Cavitation is the vaporization of the liquid in regions of low pressure, and it has negative consequences lead to substantial losses finally contributing to the degradation of pump performance and higher cost of the mission. This makes cavitation an important issue in design and operation of the booster turbopump.The LOX booster turbopump is typically designed to operate in slightly cavitating condition and permits the main pump to work at higher speeds [3,4]. The term cavitating refers to the fact that the pump is capable of operating over a broad range of incipient cavitation before a noticeable pump head drop off.

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Section: Comparison Between Different Performance Characteristic Curvmentioning

confidence: 99%

“…This flow in the inducers along with backflows both upstream and downstream at the offdesign conditions lead to a drop in efficiency [20].…”

Section: Effect Of Mass Flow Variationmentioning

confidence: 99%

Effect of leading edge sweep on the performance of cavitating inducer of LOX booster turbopump used in semicryogenic engine

Mishra

Ghosh

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The predicted temperature field shows that the reduction in temperature restrains the growth of cavitating bubbles. LI et al [7] investigated the periodically unsteady pressure field and head-drop phenomenon caused by leading edge cavitation with CFD method. The results were compared with experimental data under non-cavitation and cavitation conditions and a good agreement was obtained for the global performance.…”

Section: Introductionmentioning

confidence: 99%

Massively Parallel Simulation of the Characteristics of Cavitation Flow in a Centrifugal Pump Impeller

Zhang¹,

Zhang²

2017

dtetr

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Abstract. The paper presents numerical simulation of the characteristics of cavitation flow in a centrifugal pump impeller. Analysis was performed by OpenFOAM code. A two-phase cavitation model which includes the local vapor volume fraction and having the spatial and temporal variation of the vapor fraction was introduced. Simulation results show that the cavitation of the centrifugal pump mainly occurs in the impeller region. At the tip of the impeller pressure side, the pressure is higher than the critical pressure resulting in cavitation bubble collapse. The cavitation damage will occur here.

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“…And the numerical results show satisfactory agreement with experimental measurements and observations for both slow and fast transient pitching cases. Li et al [17] also utilized k   SST model to simulate leading edge cavitation in a single stage centrifugal pump with a whole flow passage, and investigated the periodically unsteady pressure field and head-drop phenomenon. The numerical results were compared with experimental data and a good agreement was obtained for the global performance, implying the suitability of numerical simulation in studying the cavitating flow in the pump.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the characteristics of natural supercavitation by planar symmetric wedge-shaped cavitators for rotational supercavitating evaporator

Zheng

et al. 2015

Sci. China Technol. Sci.

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With the application of supercavitation effect, a novel device named rotational supercavitating evaporator (RSCE) was recently designed for desalination. In order to improve the blade shape of rotational cavitator in RSCE for performance optimization and then design three-dimensional blades, numerical simulations are conducted on the supercavitating flows (with cavitation number ranging from 0.055 to 0.315) around two-dimensional planar symmetric wedge-shaped cavitators with different wedge angles varied from 10 to 180 degrees. Proper numerical method for simulating supercavitating flows around planar symmetric cavitator is established, and assessment of   turbulence model in simulating cavitating flows is conducted. It shows that the size of computational domain would affect the simulation result. Empirical formulae for supercavity dimensions about cavitation number at different wedge angles are obtained, which are of significant importance in the subsequent design of three-dimensional blade. The characteristics of resistance at different wedge angles are discussed, which, together with the characteristics of supercavity dimensions, play important roles in the optimal design of RSCE. rotational supercavitating evaporator, desalination, Planar symmetric wedge-shaped cavitators, CFD numerical simulation Citation:Zheng Z Y, Li F C, Li Q, et al. Numerical study on the characteristics of natural supercavitation by planar symmetric wedge-shaped cavitators for rotational supercavitating evaporator.

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Numerical simulation of leading edge cavitation within the whole flow passage of a centrifugal pump

Cited by 48 publications

References 15 publications

Effect of leading edge sweep on the performance of cavitating inducer of LOX booster turbopump used in semicryogenic engine

Effect of leading edge sweep on the performance of cavitating inducer of LOX booster turbopump used in semicryogenic engine

Massively Parallel Simulation of the Characteristics of Cavitation Flow in a Centrifugal Pump Impeller

Numerical study on the characteristics of natural supercavitation by planar symmetric wedge-shaped cavitators for rotational supercavitating evaporator

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