Physical and numerical study on unsteady shedding behaviors of ventilated partial cavitating flow around an axisymmetric body

Wang, Guoyu; Kong, Decai; Wu, Qing; Liu, Taotao; Zheng, Yuan; Huang, Biao

doi:10.1016/j.oceaneng.2019.106884

Cited by 21 publications

(3 citation statements)

References 28 publications

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“…Compared with passive methods [5][6][7][8] , active methods enable the real-time adjustment to meet requirements of different operation conditions. In the past decades, several promising active control technologies have been applied in cavitation suppression, such as ultrasound and electrolysis [9][10], injection of liquid [11][12][13], mixture solution [14][15] and air [16][17]. Recently, air injection is more preferable for many researchers due to its simplicity and cleanliness.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on effects of air injection on cavitation pressure pulsation and vibration in a centrifugal pump with inducer

Mao,

Liu,

Wang

et al. 2023

J Hydrodyn

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Cavitation commonly induces performance deterioration and system vibration in many engineering applications. This paper aims to investigate the effects of air injection on cavitation evolution, pressure pulsation and vibration in a centrifugal pump with inducer. In this paper, the high-speed camera is used to capture the gas ow pattern and cavitation evolution process in the inducer. The impacts of air injection on the inlet pressure pulsation and vibration are also investigated. The results show that the cavitation development in the inducer undergoes four patterns: incipient cavitation, sheet cavitation, cloud cavitation and super cavitation. As the cavitation becomes more severe, the main frequency of the pressure pulsation shifts to lower frequencies, and the amplitude of the vibration increase. In addition, air injection promotes the incipient cavitation but delays the cavitation development. A small amount of air makes cavity shed with small-scale clusters. Meanwhile, it can effectively decrease amplitudes of pressure pulsation and vibration. As the air content increases, the uctuations and amplitudes of pressure pulsation and vibration increase.

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Section: Introductionmentioning

confidence: 99%

Experimental study on effects of air injection on cavitation pressure pulsation and vibration in a centrifugal pump with inducer

Mao,

Liu,

Wang

et al. 2023

J Hydrodyn

View full text Add to dashboard Cite

show abstract

“…A vehicle in the all-wet state has a large traveling resistance due to the viscous action of the liquid [17,18]. The use of gas ventilation can make the entire surface of the vehicle covered with a layer of gas film, achieving a good drag reduction effect [19][20][21]. Through further water tunnel tests [22,23], it was found that an increase in ventilation volume can improve the stability of the cavity and reduce the load on the test body.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Motion Characteristics of Cavity Attached to the Tail of Underwater Vehicle

Yao

et al. 2023

JMSE

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The formation and development of an attached cavity at the tail of an underwater moving vehicle involves a complex multiphase flow, which determines the load characteristics and motion stability of the vehicle. In this study, an experimental method was used to explore the formation process and motion characteristics of the cavity at the tail of the vehicle, and a pressure sensor installed at the tail of the model was used to establish the relationship between the evolution of the tail attachment cavity and transient pressure. The study found that the process of pulling and breaking the attached cavity was accompanied by the generation of bidirectional jets, and reducing the cavitation number could weaken the occurrence of jet impact. When the ventilation flow reaches the critical value Q¯in = 1.28, the cavity pulsates. In addition, increasing the ventilation flow does not increase the size of the tail cavity, and the length of the cavity at the closure increases with the decrease of the cavitation number.

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“…Cavitation bubbles are unstable, and cavitation dynamics will cause periodic cloud shedding and collapse. Many scholars have investigated the evolution of different cavitation bubbles [19][20][21]. Kubota et al [22] conducted an experimental study on the flow structure around the unsteady cloud cavitation on a two-dimensional hydrofoil, and successfully measured the unstable structure of the cloud cavitation through laser Doppler anemometry.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Unsteady Natural Cloud Cavities: Influence of Cavitation Number on Cavity Evolution and Pressure Pulsations

Sun

Zhang

et al. 2021

JMSE

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High-speed underwater vehicles are subjected to complex multiphase turbulent processes, such as the growth, development, shedding, and collapse of cavitation bubbles. To study the cavity evolution and pressure pulsation characteristics, in this paper, cloud cavitation over a conical axisymmetric test body with four pressure sensors is investigated. A multi-field simultaneous measurement experiment method for the natural cavitation of underwater vehicles is proposed to understand the relationship between cavity evolution and instantaneous pressure. The results show that the evolution of cloud cavitation can be mainly divided into three stages: (I) the growth process of the attached cavity, (II) the shedding process of the attached cavity, and (III) the collapse of detached cavities. The evolution of the attached cavity and collapse of the large-scale shedding cavity will cause strong pressure pulsations. It is found that the cavitation number plays an important role in cavitation evolution and pressure pulsation. Interestingly, as the cavitation number decreases, the fluctuation intensity of cavitation increases significantly and gradually presents obvious periodicity. Moreover, the unstable cavitating flow patterns are highly correlated with the time domain and frequency domain characteristics of pressure. Especially, as the cavitation number decreases, the main frequency becomes lower and the pressure band becomes more concentrated.

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Physical and numerical study on unsteady shedding behaviors of ventilated partial cavitating flow around an axisymmetric body

Cited by 21 publications

References 28 publications

Experimental study on effects of air injection on cavitation pressure pulsation and vibration in a centrifugal pump with inducer

Experimental study on effects of air injection on cavitation pressure pulsation and vibration in a centrifugal pump with inducer

Experimental Study on Motion Characteristics of Cavity Attached to the Tail of Underwater Vehicle

Experimental Study on the Unsteady Natural Cloud Cavities: Influence of Cavitation Number on Cavity Evolution and Pressure Pulsations

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