Model Experimental Study of Damage Effects of Ship Structures under the Contact Jet Loads of Bubble in a Water Tank

Chen, Hailong; Ni, Baoyu; Hu, Wenjin; Yang, Xue

doi:10.1155/2018/8456925

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…There are many methods to produce underwater high-pressure bubbles, such as using an electric spark, explosion, and a high-pressure airgun. An electric spark bubble is usually used in laboratories and has become an effective method for mechanism experimentation of bubble sources [13][14][15]. Cui et al [8] conducted an icebreaking experiment using spark bubbles in an open water tank and verified the feasibility of icebreaking by using underwater bubbles.…”

Section: Introductionmentioning

confidence: 99%

Ice-Water-Gas Interaction during Icebreaking by an Airgun Bubble

Wang

et al. 2022

JMSE

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When an airgun releases high-pressure gas underwater below an ice plate, it is observed that a bubble is formed rapidly while the ice plate is broken fiercely. In order to study the ice-water-gas interaction during this transient and violent phenomenon, a set of laboratory-scale devices was designed and a series of icebreaking experiments were carried out. High-speed photography was used to capture the evolution of the bubble and the ice plate. It was found that the airgun bubble had a unique ‘pear’ shape compared with the spherical bubble generated by electric sparking. The pressure induced by the pulsation of the airgun bubble near a rigid wall was measured by the pressure sensor. The initial shockwave, oscillatory pressure peaks caused by the directional fast air injection, secondary shockwave, and pressure peak caused by the bubble jet impact were clearly recorded. Three damage patterns of ice plates were observed and corresponding reasons were analyzed. The influence of dimensionless parameters, such as airgun-ice distance H and ice thickness T, was also investigated. The physical mechanism of ice-water-gas interaction was summarized.

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Section: Introductionmentioning

confidence: 99%

Ice-Water-Gas Interaction during Icebreaking by an Airgun Bubble

Wang

et al. 2022

JMSE

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“…A change in volume leads to a variation in efficiency and stability during the EDM process. [14][15][16] As the formation of bubbles is practically inevitable, taking measures to eliminate bubbles may be essential. Therefore, studying the mechanism of bubble motion and devising methods for removing bubbles are of great significance.…”

Section: Introductionmentioning

confidence: 99%

Mechanism study of bubble removal in narrow viscous fluid by using ultrasonic vibration

Wang¹,

Chen²,

Chen³

et al. 2019

Jpn. J. Appl. Phys.

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The mechanism of bubble removal in a narrow viscous fluid by using ultrasonic vibration is analyzed in this study. Experimental studies were performed on the adhesive bonding between a carbon fiber reinforced plastic (CFRP) laminate and an aluminum plate. After applying ultrasonic vibration on the CFRP laminate, it was found that the high-frequency vibration could induce an oscillating flow of the adhesive in the narrow bonding layer. Such a flow caused the entrapped bubbles to move and break until all of them were eliminated from the viscous adhesive. A fluid–solid coupling simulation and fluid tracer analysis were performed to analyze the underlying principle of bubble motion. The results reveal that because of the internal pressure of the bubble and the asymmetric characteristic of the fluid resistance around the bubble, the oscillating fluid induced by ultrasonic vibration drove the bubble to move in the direction closest to the edge. The reduction of the gas volume fraction in the adhesive resulted in an improved bonding between the CFRP laminate and aluminum plate.

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“…In interaction of the flow with structural elements significant hydrodynamic loads arise transmitted to the structural elements of the spillway and, in some cases, to other structures of the hydropower complex. Moreover, as a result of the attack of high-velocity flows on the structures, cavitation manifestation and associated cavitation erosion can be observed [8,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Cavitation in swirling flows of hydraulic spillways

Orekhov¹

2019

E3S Web Conf.

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During operation of high-head hydraulic spillway systems, cavitation phenomena often occur, leading to destruction of structural elements of their flow conductor portions. The article is devoted to the study of erosion due to cavitation in the circulation flows of eddy hydraulic spillways, including those equipped with counter-vortex flow energy dissipators. Cavitation destructive effects depend on many factors: intensity consisting in the rate of decrease in the volume or mass of a cavitating body per unit of time, the stage of cavitation, geometric configuration of the streamlined body, the content of air in water, the flow rate, the type of material. The objective of the study consisted in determination of cavitation impacts in circulating (swirling) water flows. The studies were conducted by a method of physical modeling using high-head research installations. Distribution of amplitudes of pulses of shock cavitation impact is obtained according to the frequency of their occurrence depending on the flow velocity, the swirl angle, the height of the cavitating drop wall and the stage of cavitation. The impact energy depending on the stage of cavitation and the flow rate is given for different operating modes of the counter-vortex flow energy dissipators of a hydraulic spillway. In the conclusions, it is noted that cavitation impacts in the circulation flows occur mainly inside the flow, which is a fundamental difference from similar processes in axial flows.

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Model Experimental Study of Damage Effects of Ship Structures under the Contact Jet Loads of Bubble in a Water Tank

Cited by 6 publications

References 27 publications

Ice-Water-Gas Interaction during Icebreaking by an Airgun Bubble

Ice-Water-Gas Interaction during Icebreaking by an Airgun Bubble

Mechanism study of bubble removal in narrow viscous fluid by using ultrasonic vibration

Cavitation in swirling flows of hydraulic spillways

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