Effect of Tip Clearance on the Internal Flow and Hydraulic Performance of a Three-Bladed Inducer

Fu, Ying-Shuang; Yuan, Jianping; Yuan, Shouqi; Pace, Giovanni; d’Agostino, Luca

doi:10.1155/2017/2329591

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…The Cavitating Pump Rotordynamic Test Facility (Figure 2) is a versatile and easily instrumentable water loop operating at temperatures up to 90 °C, in order to adequately scale thermal cavitation effects developing when pumping most cryogenic space propellants ( [27], [22]). The facility is intended as a flexible apparatus that can readily be adapted to conduct experimental investigations on virtually any kind of fluid dynamic phenomena relevant to high performance turbopumps in a wide variety of alternative configurations (axial, radial or mixed flow pumps and their combination: centrifugal stage and inducer ( [9], [33], [34], [26], [23], [24], [25], [36] , [37] , [17]). The CPRTF equipment includes an air bag, an electrical heater and a silent throttle valve in order to adjust the pump inlet pressure, water temperature and flow rate, respectively.…”

Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames

Pace

Valentini

Pasini

et al. 2018

Journal of Fluids Engineering

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The paper describes the results of recent experiments carried out in the Cavitating Pump Rotordynamic Test Facility for the dynamic characterization of cavitation-induced flow instabilities as simultaneously observed in the stationary and rotating frames of a high-head, three-bladed axial inducer with tapered hub and variable pitch. The flow instabilities occurring in the eye and inside the blading of the inducer have been detected, identified, and monitored by means of the spectral analysis of the pressure measurements simultaneously performed in the stationary and rotating frames by multiple transducers mounted on the casing near the inducer eye and on the inducer hub along the blade channels. An interaction between the unstable flows in the pump inlet and in the blade channels during cavitating regime has been detected. The interaction is between a low frequency axial phenomenon, which cyclically fills and empties each blade channel with cavitation, and a rotating phenomenon detected in the inducer eye.

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Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames

Pace

Valentini

Pasini

et al. 2018

Journal of Fluids Engineering

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“…When the TC was small, the range of the backflow decreased but the blockage phenomenon also led to a performance decline. Yanxia F et al [21] studied the influence of TC on its internal flow and hydraulic performance. The results showed that the induced wheel structure with appropriate TC size has high pressure and hydraulic efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tip Clearance on the Cavitation Flow in a Shunt Blade Inducer

et al. 2022

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In order to study the effect of tip clearance on the internal cavitation stability of a shunt blade inducer, an external characteristics experiment of a centrifugal pump with a shunt blade inducer was carried out. Based on the turbulence model and mixture model, the cavitating flow in a centrifugal pump with the inducer was numerically simulated. The influence of tip clearance on the cavitating flow in a shunt inducer was studied and analyzed. Through the research, it was found that tip clearance has a certain influence on the critical cavitation coefficient. The existence of the tip clearance caused a significant leakage vortex near the inducer’s inlet and a strong transient effect was shown. The location and degree of cavitation caused by the tip leakage are clarified in this paper. Tip clearance has a great impact on the pressure distribution on a shunt blade inducer. The influence law of tip clearance on an inducer’s blade load distribution was clarified. The results showed that tip clearance has a significant effect on the cavitation of a shunt blade inducer under low flow rate conditions.

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“…Over the years, researchers have been committed to improving the cavitation quality of inducers in two main directions. One is to focus on the performance characteristic of inducer geometry parameters, such as the blade number [5,6], the blade spacing [7], the tip clearance [8,9], and the shape of the blade's leading edge [10][11][12]. In another direction, casing adjustment schemes attract more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Effect of Radial Height of Helical Static Blade on the Cavitation Performance of Inducer

2022

Applied Sciences

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Cavitation is a major concern in liquid rocket engine turbopumps, and as an effective measure to improve cavitation quality, an inducer with helical static blades has attracted attention in recent years. In order to study the effect of the radial height of helical static blades on the cavitation performance of the inducer, CFD methods based on the Reynolds-averaged N-S equation, the standard k-ε turbulent model, and the Schnerr and Sauer cavitation model are employed to analyze the cavitation flow characteristics of a certain inducer with different helical static blades. The results show that with the increase in radial height, the backflow in the flow field is enhanced. Affected by this situation, the head is improved, the efficiency is reduced, and the low-pressure zone on the suction surface at entrance is enlarged. The helical static blade can delay the channel blocking of cavitation by providing an extra channel for the extension of bubbles. However, the effectiveness is restricted because the cavitation area enlarges with the radial height of the helical static blade. Although the effect of radial height on the head and the cavitation performance is opposite, there is an optimal radial height from 0.05 to 0.125 that improves both at the same time.

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Effect of Tip Clearance on the Internal Flow and Hydraulic Performance of a Three-Bladed Inducer

Cited by 9 publications

References 15 publications

Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames

Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames

Effect of Tip Clearance on the Cavitation Flow in a Shunt Blade Inducer

Effect of Radial Height of Helical Static Blade on the Cavitation Performance of Inducer

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