Investigation of the flow phenomena in high-pressure water jet nozzles

Urazmetov, Oleg; Cadet, Marcel; Teutsch, Roman; Antonyuk, Sergiy

doi:10.1016/j.cherd.2020.10.030

Cited by 22 publications

(6 citation statements)

References 24 publications

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“…They found that a lower launch angle could yield a bigger flying speed. Other numerical studies of jet nozzles can be found in Urazmetov et al (2021) and Tabatabaei et al (2015).…”

Section: Introductionmentioning

confidence: 99%

Thrust and torque production of a squid-inspired swimmer with a bent nozzle for thrust vectoring

2022

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A three-dimensional pulsed-jet propulsion model consisting of a flexible body and a steerable bent nozzle in tethered mode is presented and studied numerically. By prescribing the body deformation and nozzle angle, we examine the flow evolution and propulsive/turning performance via thrust vectoring. Our results show that the vortex ring is no longer axis-symmetric when the jet is ejected at an angle with the incoming flow. A torque peak is observed during jetting, which is mainly sourced from the suction force (negative pressure) at the lower part of the internal nozzle surface when the flow is directed downward through an acute angle. After this crest, the torque is dominated by the positive pressure at the upper part of the internal nozzle surface, especially at a relatively low jet-based Reynolds number (О(102)). The torque production increases with a larger nozzle bent angle as expected. Meanwhile, the thrust production remains almost unchanged, showing little trade-off between thrust and torque production which demonstrates the advantage of thrust vectoring via a bent nozzle. By decoupling the thrust at the internal and outer surfaces considering special characteristics of force generation by pulsed-jet propulsion, we find that variations in Reynolds number mostly affect the viscous friction at the outer surfaces. The influence of the maximum stroke ratio is also studied. Results show that both the time-averaged thrust and the torque decrease at a larger stroke ratio.

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“…They found that a lower launch angle could yield a bigger flying speed. Other numerical studies of jet nozzles can be found in Urazmetov et al (2021) and Tabatabaei et al (2015).…”

Section: Introductionmentioning

confidence: 99%

Thrust and torque production of a squid-inspired swimmer with a bent nozzle for thrust vectoring

2022

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“…It is obvious that the character of the submerged air flow is different, and it would be necessary to study it in a more detailed way. Numerical simulation similar to [36,37] might be helpful, although recent research works are focused primarily on the jet breakup improvement which is not the goal that we are aiming for. The trendlines for the submerged experiments are quite different from the in-air ones.…”

Section: Resultsmentioning

confidence: 99%

A Short Note about the Impact Action of a Water Jet Stabilized by a Coaxial Air Stream in the Air and Underwater

2021

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A new original method, applying a coaxial protective airflow, was tested aiming to improve the pure water jet efficiency in surface layer removal or medium hard materials cutting or blasting. The dual action of the air flow is expected: the air co-flowing the water jet with approximately the same velocity should prevent the central jet from breaking up into tiny droplets in the near field, and simultaneously, it should support jet decomposition into big parts with enough destructive potential in the far-field. A brief survey of the relevant literature dealing with the water jet instability is presented, introducing four recognized breakup regimes. An original cutting head designed to generate a waterjet surrounded by protective coaxial air flow is introduced. The submitted device is supposed to operate within the first wind-induced regime. Two types of experiments, consisting of blasting limestone bricks placed either in the air or underwater, were realized. The depths of kerfs produced with different water pressures and air overpressures were evaluated. While no substantial positive effect was recognized in the air performance, the submerged blasting of the same material under similar conditions appeared to be promising.

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“…The water jet has high speed and great energy, so it has a great striking force and destructive power [2,3]. However, the existing studies only focus on the influence of a certain parameter on the rust removal efficiency of high-pressure water jet or the motor power, without actual simulation experiments on the specific parameters of the nozzle [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Flow Field Simulation and Nozzle Parameter Optimization of Rust Removal Robot Based on High-Pressure Water Jet Technology

Peng,

Ma,

et al. 2024

J. Phys.: Conf. Ser.

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To enhance the safety and longevity of large ships, employing high-pressure water jet technology for rust removal is crucial in this article, the qualitative relationship among the key parameters of high-pressure water jet rust removal is analyzed theoretically. Secondly, the flow field simulation is carried out using Computational Fluid Dynamics (CFD) software to verify the relationship among the key parameters. Finally, the influence of different nozzle length-diameter ratios on jet characteristics is analyzed. The simulation results show that the nozzle end length is 0 mm and the nozzle diameter is 1mm for the straight-cone convergent nozzle with a shrinking angle of 30° when the diameter of the length-diameter ratio remains unchanged and the length of the nozzle end is changed. Simultaneously, the highest values are observed for the nozzle exit velocity and the impact force on the target surface. The impact range of target shear force takes the maximum value when the length-diameter ratio is 1. Further, by changing the length of the nozzle-end and the nozzle diameter in the length-diameter ratio, the influence on the jet characteristics can be concluded that the nozzle diameter has a greater influence on the nozzle exit velocity than the nozzle-end length. On this basis, the optimized nozzle parameters can be obtained i.e., the nozzle-end length is 1 mm and the nozzle diameter is 1 mm, such that the effective striking area of the jet is the largest and the striking effect is the best.

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Investigation of the flow phenomena in high-pressure water jet nozzles

Cited by 22 publications

References 24 publications

Thrust and torque production of a squid-inspired swimmer with a bent nozzle for thrust vectoring

Thrust and torque production of a squid-inspired swimmer with a bent nozzle for thrust vectoring

A Short Note about the Impact Action of a Water Jet Stabilized by a Coaxial Air Stream in the Air and Underwater

Flow Field Simulation and Nozzle Parameter Optimization of Rust Removal Robot Based on High-Pressure Water Jet Technology

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