Efficiency analysis of jet pumps without diffusers.

Narui, Hiroshi; Inagaki, Susumu

doi:10.1299/kikaib.57.575

Cited by 2 publications

(3 citation statements)

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“…The flow rate Q discharged from the secondary nozzle is expressed by the product of the average flow velocity V av on the nozzle exit surface and the nozzle cross-sectional area A. That is, 1 2 37…”

Section: Data Analysis Methodsmentioning

confidence: 99%

“…In the past, various studies on the performance and efficiency of jet pumps have been carried out, but in many cases the research has been conducted on jet pumps incorporated as a part of mechanical systems [1][2][3][4]. Specific examples of the research so far include various slurry transport pumps [5], suction pumps applied to deep wells [6], refrigeration cycle driven pumps using various refrigerants [7], two different fluid mixing apparatuses [8] and so on.…”

Section: Introductionmentioning

confidence: 99%

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Operating Characteristics of Multi-Injection Type Underwater Jet Pump

Sakuragi¹

2018

AJMA

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A method of installing a jet pump at the bottom of a contaminated lake or river and stirring the contaminated area with a jet of large flow rate generated by the jet pump to promote water purification has attracted attention. By stirring the contaminated area, dissolved oxygen in the water is supplied to the stagnant area. As a result, the activity of the bacteria in the water is enhanced, and the decomposition and removal of the contaminants is promoted. In this study, the structure and operating conditions of a jet pump capable of generating a jet flow of larger flow rate with less energy consumption was pursued. In particular, the operation efficiency of the jet pump in the case of adopting the multi-nozzle injection method as the supply method of the primary jet was experimentally evaluated by precise flow rate measurement in a large tank experiment. In addition, quantitative evaluation of energy consumed by constituent equipments such as electric motors, pumps, pipelines and so on constituting the jet pump system was performed, and the total energy efficiency of the jet pump system was also evaluated. As a result, it became clear that the multi-injection method of the primary jet shows superior energy efficiency compared with the jet pump of the conventional structure.

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Section: Data Analysis Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Operating Characteristics of Multi-Injection Type Underwater Jet Pump

Sakuragi¹

2018

AJMA

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“…Jet pumps that use a jet flow as a motive fluid have long been applied in various fields, and fundamental studies have investigated the pressurizing mechanism and behavior of the internal flow field and optimum πftdt sin sa U T/ T 2 2 0 1  operating and geometry conditions to improve their performance and efficiency (Hoshi et al 1964;Sanger 1970;Narui and Inagaki 1991;Huang et al 1999;Narabayashi et al 2006;Yamazaki et al 2007;Little et al 2015;Xiao et al 2016). Motive fluid ejected from the nozzle of the jet pump involves fluid from the surroundings, and discharges to a thought/duct.…”

Section: Introductionmentioning

confidence: 99%

Influence of Stroke on Performance Characteristics of Synthetic Jet Fan

Nishibe

Nomura

Noda

et al. 2018

JAFM

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Synthetic jets, whose size and weight can be reduced easily, have become an attractive alternative to continuous jets. Many experimental and numerical studies have been conducted on synthetic jets to investigate their fundamental flow characteristics, including jet structure, for applied research such as boundary layer control and enhanced fluid mixing. However, few studies have focused on fluid transportation devices using synthetic jets as a driving source. Therefore, several issues concerning fluid transport characteristics still need to be resolved. In addition, although optimum operation of devices using synthetic jets is essential for their practical use, few studies have focused on this issue. The present study experimentally demonstrates the influence of the dimensionless stoke L on the performance characteristics of a synthetic jet fan under Reynolds number Re = 1800 and the same fan geometry; here, the stroke l is nondimensionalized by the primary slot width b. Furthermore, numerical simulations are conducted to complement the experiment. Velocity and pressure measurements are performed using a hot-wire anemometer, differential pressure manometer, and pressure transducer. The influence of the dimensionless stroke L on the performance/efficiency curves, static pressure distribution on the duct surface, and unsteady flow characteristics are investigated. Moreover, the flow field inside the duct is observed through numerical simulation. The results show that the performance characteristics and pressure recovery process depend on the dimensionless stroke L, and an optimum range of dimensionless stroke L exists for operation.

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Efficiency analysis of jet pumps without diffusers.

Cited by 2 publications

References 0 publications

Operating Characteristics of Multi-Injection Type Underwater Jet Pump

Operating Characteristics of Multi-Injection Type Underwater Jet Pump

Influence of Stroke on Performance Characteristics of Synthetic Jet Fan

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