Experimental investigation of cavity length pulsation characteristics of jet pumps during limited operation stage

Wang, Jiong; Xu, Shuangjie; Cheng, Huai-Yu; Ji, Bin; Zhang, Junqiang; Long, Xinping

doi:10.1016/j.energy.2018.08.035

Cited by 22 publications

(8 citation statements)

References 36 publications

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“…Regarding turbulence modeling, there is a general agreement towards the k-ω SST model [11]; conversely, an agreement regarding multi-phase simulation strategies is not reached (see below). The difficulty in defining these closures arises from the lacks of knowledge concerning the "local-scale" phenomena and high-resolution data are needed in single-and multi-phase operations as, for example, demonstrated in the studies of Karthick et al [48] (schlieren visualization and wall static pressure measurements) and Wang et al [49] (image analysis). These observations might also support theoretical studies (viz., the second research direction) to describe the physics of ejector fluid dynamics.…”

Section: 4mentioning

confidence: 99%

Ejectors on the cutting edge: The past, the present and the perspective

Besagni

2019

Energy

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Section: 4mentioning

confidence: 99%

Ejectors on the cutting edge: The past, the present and the perspective

Besagni

2019

Energy

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“…A criterion should be introduced to calculate the cavitation because the cavitation boundary is distinct but not neat. As discussed by (Wang et al, 2018), the average of the gray value λ s = λ max +λ min 2 is employed as the threshold, which is used to define the initial and the collapse end point of the cavitation. If the distance λ ≥ λ s , then the distance from the collapse to start boundary is the cavitation length.…”

Section: Resultsmentioning

confidence: 99%

Influence of inlet pressure on cavitation characteristics in regulating valve

Liu

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The cavitation development process in regulating valve under different inlet pressures is investigated experimentally and numerically in our paper. The influence of inlet pressure P in on cavitation location, shape, area and intensity is studied in axial and radial directions, and the axial and radial pressure distributions are also analyzed. The cavitation is generally annular in shape radially and irregular polygon in shape axially. Cavitation bubbles occur at the throat entrance when the inlet pressure increases. The bubbles then accumulate, and a bubble ring is formed. The cavitation development process under different inlet pressures is separated into three stages, no-cavitation, initial cavitation and steady-cavitation stages. During the no-cavitation stage, no bubbles exist. During the initial cavitation stage, bubbles occur and the area and intensity of cavitation increase in the radial and axial directions with increasing inlet pressure. During the steady-cavitation stage, the calculation area and intensity of bubble rings reach their maximum values and then remain stable. The cavitation bubbles extend downstream, and the area of cavitation ring and cavitation intensity increase with increasing inlet pressure. A slit exists between the upper and lower parts of bubbles in the cavitation process, both parts touch each other forming a whole.

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“…However, they have unique applications in some particular circumstances. Except for the working environments being different, there are some operating characteristics of jet slurry pumps that are the same as ordinary single-phase jet pumps, and the efficiency still depends on a few main parameters in jet pump theory, such as the nozzle structure [8], area ratio [35] and flow ratio [36]. These parameters [37] of the area ratio m, flow ratio M, pressure ratio H and efficiency η of the jet pump are defined as follows:…”

Section: Jet Pump Parametersmentioning

confidence: 99%

“…Its working principle is transferring mass and heat through turbulent diffusion between the primary and secondary flows [7]. The advantages of reliable operation, low cost and easy maintenance [8] make it widely used in many industrial fields, such as the refrigeration industry [9], water conservancy engineering [10], aerospace engineering [11], chemical industry [12] and fish farming [13]. Previous studies have shown that the performance of the jet pump is greatly affected by the construction dimensions [14][15][16] and operating conditions [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Flow Field and Mass Transfer Characteristics in a Jet Slurry Pump

et al. 2021

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A jet pump is used to transport a variety of working media and is especially suitable for dredged soil transporting. In this study, a three-dimensional numerical study of a jet pump that is used for slurry delivery was carried out. The characteristics of the internal flow field of the mixing chamber with different working parameters were comprehensively analyzed. The results indicate that the pressure of the axial line decreases with increasing flow ratio (ratio of suction flux and inlet flux) while the pressure of the injected slurry shows a downward trend. With the increase in the flow ratio, the pressure ratio (difference between inlet pressure and suction pressure divided by the difference between exit pressure and suction pressure) falls off while the efficiency presents a parabolic distribution. The pressure ratio can be promoted by properly increasing the length of the mixing chamber so that the available efficiency is broadened. When the mixing chamber length is L = 2.5Dn~4.0Dn (Dn is nozzle outlet diameter), the highly efficient area is wide; in particular, when L = 3.5Dn, the jet slurry pump with the highest efficiency of 27.6% has the best performance.

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Experimental investigation of cavity length pulsation characteristics of jet pumps during limited operation stage

Cited by 22 publications

References 36 publications

Ejectors on the cutting edge: The past, the present and the perspective

Ejectors on the cutting edge: The past, the present and the perspective

Influence of inlet pressure on cavitation characteristics in regulating valve

Numerical Investigation of the Flow Field and Mass Transfer Characteristics in a Jet Slurry Pump

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