Software Technology Research on Control System of Ultra High Pressure Water Jet Rust Removal Equipment

Sun, Liping; Gong, Yong Jun; Zhang, Zeng Meng; Wang, Zu Wen

doi:10.4028/www.scientific.net/amr.721.372

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…In recent years, with the implementation of energy-saving and environmental protection policies, the traditional cleaning technology for large-scale equipment with high pollution such as shot blasting is gradually eliminated. e high-pressure water jet cleaning technology has the characteristics of good processing quality, high efficiency, and environmentally friendly, which is gradually applied to the cleaning process of large-scale marine and chemical equipment [1]. e submerged high-pressure water jet is commonly accompanied by intensive cavitation; when the cavitation number is low and the bubble concentration is high, it is difficult to accurately measure the internal flow field by means of PIV or LDV.…”

Section: Introductionmentioning

confidence: 99%

Numerical Research of the Submerged High‐Pressure Cavitation Water Jet Based on the RANS‐LES Hybrid Model

Yang

Shi

Tan

et al. 2021

Shock and Vibration

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The submerged high-pressure water jet has the characteristics of high velocity, strong turbulence, and severe cavitation. In order to reveal the formation mechanism of shear cavitation in the submerged high-pressure water jet and to grasp the turbulent structure and velocity distribution characteristics in the jet, the prediction ability of different turbulence models is studied first. The models represent the RANS model and RANS-LES hybrid model which are used to simulate the same cavitation jet, and the results are compared with the experimental results. The most reasonable model is then used to investigate the submerged high-pressure cavitation jet with different cavitation numbers. It is found that the calculation accuracy for small-scale vortexes has a great influence on the prediction accuracy of cavitation in the submerged jet. Both the DDES model and the SBES model can effectively capture the vortexes in the shear layer, and the SBES model can obtain more turbulence details. The result of the simulation under different cavitation numbers using the SBES model agrees well with the experimental result. Under the condition with low cavitation number, an intensive shear layer is formed at the exit of the nozzle, and small-scale vortexes are distributed along the shear layer. Mass transfer rate is relatively high in the region with a stronger vortex, which confirms that the low pressure in the vortex center is the main reason for the generation of cavitation in the shear layer. With the decrease of the cavitation number, the cavitation intensity increases obviously, while the nondimensional velocity along the radial direction changes little, which follows an exponential function.

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Section: Introductionmentioning

confidence: 99%

Numerical Research of the Submerged High‐Pressure Cavitation Water Jet Based on the RANS‐LES Hybrid Model

Yang

Shi

Tan

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…High-pressure jet technology has the characteristics of high energy density, strong impact force, and high controllability. It is widely used in petroleum engineering, ship cleaning, and metal material-strengthening engineering fields [1][2][3]. When the high-pressure jet is submerged, the velocity of the nozzle outlet can usually reach more than 200 m/s.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Unsteady Characteristics and the Impact Performance of a High-Pressure Submerged Cavitation Jet

Yang

Shi

et al. 2020

Shock and Vibration

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High-pressure submerged cavitation jet is widely used in the fields of material peening, petroleum drilling, and ocean engineering. The impact performance of the jet with intensive cavitation is related to the factors such as working condition and the nozzle geometry. To reveal the relationship between the nozzle divergent angle and the jet pressure on the unsteady characteristics of the jet, high-speed photography with frame rate of 20000 fps is used to record the image of the cavitation clouds. Grayscale analysis algorithm developed in MATLAB is used to study the effects of injecting condition on the special structure, unsteady characteristics, and shedding frequency of the cavitation bubbles. The impact load characteristics of the cavitation jet with different cavitation numbers and stand-off distances are recorded using a high-response pressure transducer. It is found that the cavitation number is the main factor affecting the cavitation morphology of the submerged jet. The lower the cavitation number is, the more intense the cavitation occurs. The outlet divergent angle of the convergent-divergent nozzle also has a significant influence on the development of the cavitation clouds. In the three nozzles with the outlet divergent angles of 40°, 80°, and 120°, the highest bubble concentration is formed usinga nozzle with a divergent angle of 40°, but the high-concentration cavitating bubbles are only distributed in a very small range of the nozzle outlet. The cavities generated by using the nozzle with a divergent angle of 80° can achieve good results in terms of concentration and distribution range, while the nozzle with divergent angle of 120° has lower cavitation performance due to the lack of the constraint at the outlet which intensifies the shear stress of the jet. According to the result of frame difference method (FDM) analysis, the jet cavitation is mainly formed in the vortex structure generated by the shearing layer at the nozzle exit, and the most severe region in the collapse stage is the rear end of the downstream segment after the bubble cloud sheds off. The impact load of the cavitation jet is mainly affected by the stand-off distance of the nozzle from the impinged target, while the nozzle outlet geometry also has an effect on the impact performance. Optimizing the stand-off distance and the outlet geometry of the nozzles is found to be a good way to improve the performance of the cavitation jet.

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Numerical investigation of submerged cavitation jet based on stress-blended eddy simulation

Du,

Xie,

Han

et al. 2024

J Mech Sci Technol

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Software Technology Research on Control System of Ultra High Pressure Water Jet Rust Removal Equipment

Cited by 6 publications

References 3 publications

Numerical Research of the Submerged High‐Pressure Cavitation Water Jet Based on the RANS‐LES Hybrid Model

Numerical Research of the Submerged High‐Pressure Cavitation Water Jet Based on the RANS‐LES Hybrid Model

Experimental Study on the Unsteady Characteristics and the Impact Performance of a High-Pressure Submerged Cavitation Jet

Numerical investigation of submerged cavitation jet based on stress-blended eddy simulation

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