Effect of Nozzle Outlet Shape on Cavitation Behavior of Submerged High-Pressure Jet

Wang, Gaowei; Yang, Yongfei; Wang, Chuan; Shi, Weidong; Li, Wei; Pan, Bo

doi:10.3390/machines10010004

Cited by 15 publications

(6 citation statements)

References 35 publications

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“…Dong [16] designed a diagonal nozzle with the k-ε model and researched the impact of intake constriction, parallel mid-section. Wang [17] used the proper orthogonal decomposition method (POD) to analyze cavitation cloud characteristics in organ pipe nozzles. Stanley et al [18] used direct numerical simulation (DNS) to study the creation of a free jet flow and the non-constant flow properties of a free-jet-flow shear layer.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Composite Cavitation Nozzle Parameters Based on the Response Surface Methodology

Huang,

Qiu,

Song

et al. 2024

Water

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Cavitation is typically observed when high-pressure submerged water jets are used. A composite nozzle, based on an organ pipe, can increase shear stress on the incoming flow, significantly enhancing cavitation performance by stacking Helmholtz cavities in series. In the present work, the flow field of the composite nozzle was numerically simulated using Large Eddy Simulation and was paired with the response surface method for global optimizing the crucial parameters of the composite nozzle to examine their effect on cavitation behavior. Utilizing peak gas-phase volume percent as the dependent variable and the runner diameter, Helmholtz chamber diameter, and Helmholtz chamber length as independent variables, a mathematical model was constructed to determine the ideal parameters of the composite nozzle through response surface methodology. The optimized nozzle prediction had an error of only 2.04% compared to the simulation results, confirming the accuracy of the model. To learn more about the cavitation cloud properties, an experimental setup for high-pressure cavitation jets was also constructed. Impact force measurements and high-speed photography tests were among the experiments conducted. The simulated evolution period of cavitation cloud characteristics is highly consistent with the experimental period. In the impact force measurement experiment, the simulated impact force oscillates between 256 and 297 N, and the measured impact force oscillates between 260 N and 289 N, with an error between 1.5% and 2.7%. The simulation model was verified by experimental results. This study provides new insights for the development of cavitation jet nozzle design theory.

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Section: Introductionmentioning

confidence: 99%

Optimization of Composite Cavitation Nozzle Parameters Based on the Response Surface Methodology

Huang,

Qiu,

Song

et al. 2024

Water

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“…Topological optimization, aimed at minimizing mass [49][50][51][52][53][54] and developing cutting-edge micro-grippers [55], is also a crucial stage in the optimization process. To enhance interaction with the manipulated object, optimization of the active surface of the bodies in contact with the object [56][57][58][59][60] or the nozzle elements [61][62][63][64] responsible for forming the interacting flow are often employed.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Outer Diameter Bernoulli Gripper with Cylindrical Nozzle

et al. 2023

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Gripping and manipulating objects using non-contact and low-contact technologies is becoming increasingly necessary in manufacturing. One of the promising contactless gripping technologies is Bernoulli gripping devices for industrial robots. They have many advantages, but when changing the nozzle geometry, it is difficult to find the optimal parameters of the outer diameter of the gripper and its operating parameters. Therefore, the article presents a model for numerical simulation of the dynamics of airflow in the nozzle of the Bernoulli gripping device and in the radial gap between its active surface and the surface of the object of manipulation. Reynolds-averaged Navier–Stokes equations of viscous gas dynamics, SST-model of turbulence, and γ-model of laminar-turbulent transition were used for this purpose. The technical requirements for the design of the nozzle of Bernoulli jet gripping nozzles are determined and variants of their constructive improvement are offered. According to the results of numerical simulation in the Ansys-CFD software environment, the optimal diameter of the Bernoulli gripping device and the influence of the geometric parameters of the nozzle on the nature of the pressure distribution in the radial gap and its lifting force were determined. Determined the optimal parameters of the height of the gap between the object of manipulation and the Bernoulli gripping device using C—Factor, which will allow efficient operation of Bernoulli gripping devices during automated handling operations using industrial robots.

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“…It was observed that the simulation results used under the RANS model differed from the actual flow field, and the numerical simulation results achieved via the RANS-LES and LES models agreed with the test results. The cavitating flow of the organ pipe nozzle was simulated by Wang et al [19] adopting the unsteady DES model. Akira et al [20] studied the vortex flow generated by the diesel nozzle with the LES method, and found that the LES could simulate the vortex structures better by comparing the results of this with the measured results.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Cavitating Jet Flow Field with Different Turbulence Models

Li,

Xu,

et al. 2023

Mathematics

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In numerous industries such as drilling, peening, cleaning, etc., a cavitating jet is adopted. However, it is challenging to simulate the cavitating flow field numerically with accuracy. The flow field of the organ pipe cavitation nozzle is simulated in this research using the RNG k−ε, DES, and LES turbulence models. The LES model can more accurately predict the periodic shedding of a cavitating cloud, which is basically consistent with the jet morphology captured with a high−speed camera. The flow pattern, cavitating cloud evolution and shedding period of a cavitating jet are analyzed. The findings demonstrate that the LES model produces a cavitating effect inside the nozzle that is superior to those produced by the RNG k−ε and DES models. The vortex rings in the diffusion section are simulated using the LES model, which accelerates cavitation. The cavitating clouds of the organ pipe nozzle show periodic evolutions, with stages of generation, development, shedding and collapse. The periodic shedding of the cavitating clouds exhibits a similar pattern in the vorticities simulated using the LES model, and the vorticities display the small-scale structures where the cavitating bubbles collapse. This study can provide a reference for the simulation of a cavitating jet and the analysis of the cavitating mechanism.

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Effect of Nozzle Outlet Shape on Cavitation Behavior of Submerged High-Pressure Jet

Cited by 15 publications

References 35 publications

Optimization of Composite Cavitation Nozzle Parameters Based on the Response Surface Methodology

Optimization of Composite Cavitation Nozzle Parameters Based on the Response Surface Methodology

Optimization of Outer Diameter Bernoulli Gripper with Cylindrical Nozzle

Numerical Investigation of Cavitating Jet Flow Field with Different Turbulence Models

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