Experimental study on vertical water entry of two tandem spheres

Yun, Honglu; Lyu, Xujian; Wei, Zhaoyu

doi:10.1016/j.oceaneng.2020.107143

Cited by 36 publications

(6 citation statements)

References 31 publications

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“…The measurement error of these parameters was less than 0.5%. The sphere was launched by an electromagnetic launcher similar to the equipment described in Yun et al (2020), and the arrangement is shown in Figure 1(a).…”

Section: Experimental Methods Of High-speed Photographmentioning

confidence: 99%

Experimental Study of a Sphere Bouncing on the Water

Lyu

Yun

Wei

2021

J. Marine. Sci. Appl.

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In this paper, the flow physics and impact dynamics of a sphere bouncing on a water surface are studied experimentally. During the experiments, high-speed camera photography techniques are used to capture the cavity and free surface evolution when the sphere impacts and skips on the water surface. The influences of the impact velocity (v1) and impact angle (θ1) of the sphere on the bouncing flow physics are also investigated, including the cavitation evolution, motion characteristics, and bounding law. Regulations for the relationship between v1 and θ1 to judge whether the sphere can bounce on the water surface are presented and analyzed by summarizing a large amount of experimental data. In addition, the effect of θ1 on the energy loss of the sphere is also analyzed and discussed. The experiment results show that there is a fitted curve of $${v}_{1}=17.5{\theta }_{1}-45.5$$ v 1 = 17.5 θ 1 - 45.5 determining the relationship between the critical initial velocity and angle whether the sphere bounces on the water surface.

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Section: Experimental Methods Of High-speed Photographmentioning

confidence: 99%

Experimental Study of a Sphere Bouncing on the Water

Lyu

Yun

Wei

2021

J. Marine. Sci. Appl.

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“…Other fundamental studies were conducted in a water tank, such as the ones by Gan et al [83] or Yun et al [84]. Gan et al [83] studied the drag reduction in a cylindrical model that moved up in a water tank while air was injected next to the head though holes of 0.052 times the diameter of the cylindrical model.…”

Section: Other Experimental Setupsmentioning

confidence: 99%

Micro/Bubble Drag Reduction Focused on New Applications

García-Magariño

Lopez-Gavilan

Sor

et al. 2023

JMSE

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Bubble drag reduction has been shown to be a promising technique for reducing the drag in ships, thus reducing the emission of pollutants and allowing the compliance with the new requirements imposed recently in this respect. Different searches have been conducted in the publications related to this technique, and an increase in interest has been shown, especially in the last decade. In this context, a review of the experimental work related to bubble drag reduction published in the last decade is presented in the present article. The works were classified according to the facility used (towing tank, cavitation tunnel, water channel, Taylor–Couette…), and the main finding are presented. It was found that two new trends in research have arisen, while there are still contradictions in the fundamental basis, which needs further study.

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“…Ishchenko et al [17] carried out experiments in which multi-strikers were simultaneously fired into water and demonstrated the possibility that the multi-strikers could reach the same target. Yun et al [18] experimentally studied two spheres sequentially entering water and observed a "multi-section cavity" behind the rear sphere after deep sealing occurred. Using numerical simulations, Zhou et al [19] simulated the entry and exit of two series objects into water and observed a disturbance in the cavity boundary when the rear object entered into the front cavity.…”

Section: Introductionmentioning

confidence: 99%

Research of the Influence of Lateral Inflow Angles on the Cavitation Flow and Movement Characteristics of Underwater Moving Objects

Xie,

Jia,

Chen

et al. 2024

Processes

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This study examined the multi-phase flow field for a single object and two parallel/series objects under different incoming angles of lateral flow. The volume of fluid model, the Sauer–Schnerr cavitation model, and the six degrees of freedom (DOF) method were adopted to consider simulations of multi-phase flow, phase change, and object movement, respectively. The results show that, for a single object, the degree of asymmetry in the cavity profile depends on the component (the z-component) of the lateral inflow velocity in the direction perpendicular to the initial velocity of the object. As this component increases, the asymmetry of the cavity increases. The cavity length is related to the relative axial speed between the object and the water. For parallel objects, the cavity asymmetry is determined by the superimposed influence of the z-component of the lateral incoming speed and the high-pressure zone induced by the nearby object. The object located downstream relative to the lateral flow has a stronger cavity asymmetry than that of the upstream object, and the trajectory of the downstream object is more easily deviated than that of the upstream object. For tandem objects, with the increase in the lateral incoming angle, the supercavity length increases after the rear object enters into the front cavity. With the increase in the z-component of the lateral flow velocity, the deviation speed increases.

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Experimental study on vertical water entry of two tandem spheres

Cited by 36 publications

References 31 publications

Experimental Study of a Sphere Bouncing on the Water

Experimental Study of a Sphere Bouncing on the Water

Micro/Bubble Drag Reduction Focused on New Applications

Research of the Influence of Lateral Inflow Angles on the Cavitation Flow and Movement Characteristics of Underwater Moving Objects

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