High-Speed Observations of Severe Cavitation Erosion in a High-Specific-Speed Centrifugal Pump.

Soyama, Hitoshi; Shou-ren, LI; Tonosaki, Masashi; Uranishi, Kazuo; Kato, Hiroharu; Oba, Risaburo

doi:10.1299/kikaib.61.3945

Cited by 3 publications

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“…Moreover, the centrifugal pump with working fluid self-lubricating bearings can operate at higher speeds, resulting in a higher pump head and significantly reduced volume and mass of the pump [7,8]. However, increasing the rotational speed bring issues such as turbulent flow, higher net positive suction head requirement, and decreased operational stability [9]. In a two-phase cooling system, the centrifugal pump is typically installed in the low-pressure region where the incoming refrigerant pressure is close to the saturation pressure.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Flow Characteristics in a Fluid Self-Lubricating Centrifugal Pump with R134a Refrigerant

et al. 2023

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With the rapid development of information technology, researchers have paid attention to the pump-driven two-phase cooling loop technology for data centers, which imposes requirements on the efficiency and size of the pump. A fluid self-lubricating centrifugal pump with R134a refrigerant was developed to reach a higher rotation speed and oil-free system, resulting in a more diminutive size. Due to the high rotation speed and refrigerant pressure approaching saturated vapor pressure, the internal flow characteristics and cavitating characteristics are critical and complex. This paper focuses on the prototype’s head and cavitation performance based on experimental and numerical data. The experiments indicated that the head coefficient of the pump under design conditions is 0.9881, and the pump’s critical cavitation number and breakdown number are 0.551 and 0.412, respectively. The numerical results can predict the head and cavitation with deviations less than 2.6%. To study changing patterns in flow characteristics under the different operating conditions in the refrigerant centrifugal pump, the numerical model based on a modified Sauer-Schnerr cavitation model was built to analyze the distributions of pressure, temperature, relative velocity, and bubble volume across every hydraulic component and different degrees of cavitation, and proposed the influence of the thermal effect on refrigerant cavitating. The cavitating flow characteristics were obtained with the aim of providing guidance for the hydraulic design of a refrigerant centrifugal pump.

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Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Flow Characteristics in a Fluid Self-Lubricating Centrifugal Pump with R134a Refrigerant

et al. 2023

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Improvement in Fatigue Strength of Silicon Manganese Steel SUP7 by Using a Cavitating Jet.

Soyama¹

2000

JSME Int. J., Ser. A

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Cavitating Jet: A Review

Soyama

2020

Applied Sciences

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When a high-speed water jet is injected into water through a nozzle, cavitation is generated in the nozzle and/or shear layer around the jet. A jet with cavitation is called a “cavitating jet”. When the cavitating jet is injected into a surface, cavitation is collapsed, producing impacts. Although cavitation impacts are harmful to hydraulic machinery, impacts produced by cavitating jets are utilized for cleaning, drilling and cavitation peening, which is a mechanical surface treatment to improve the fatigue strength of metallic materials in the same way as shot peening. When a cavitating jet is optimized, the peening intensity of the cavitating jet is larger than that of water jet peening, in which water column impacts are used. In order to optimize the cavitating jet, an understanding of the instabilities of the cavitating jet is required. In the present review, the unsteady behavior of vortex cavitation is visualized, and key parameters such as injection pressure, cavitation number and sound velocity in cavitating flow field are discussed, then the estimation methods of the aggressive intensity of the jet are summarized.

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High-Speed Observations of Severe Cavitation Erosion in a High-Specific-Speed Centrifugal Pump.

Cited by 3 publications

References 0 publications

Numerical and Experimental Investigation of Flow Characteristics in a Fluid Self-Lubricating Centrifugal Pump with R134a Refrigerant

Numerical and Experimental Investigation of Flow Characteristics in a Fluid Self-Lubricating Centrifugal Pump with R134a Refrigerant

Improvement in Fatigue Strength of Silicon Manganese Steel SUP7 by Using a Cavitating Jet.

Cavitating Jet: A Review

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