Experimental investigation of drag characteristics of ventilated supercavitating vehicles with different body shapes

Jiang, Yunhua; Jeong, So-Won; Ahn, Byoung-Kwon; Kim, Hyoung-Tae; Jung, Young-Rae

doi:10.1063/1.5092542

Cited by 51 publications

(5 citation statements)

References 26 publications

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“…The evolution of supercavitation flow involves multiple processes of closure and separation [8]. Jiang et al [9], Mohammadrahimi et al [10], and Shao et al [11] independently examined supercavitation vehicle models with different head shapes and concluded that the cone-shaped head design is desirable to form the stable supercavitation. Based on their work, Pham et al [12] tested several models with conical heads of various angles and found that smaller cone angles contribute to the occurrence of supercavitation.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of Supercavitation Vehicle’s Hydrodynamic Noise

Ye,

Zhang,

Wang

et al. 2023

JMSE

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This paper presents the simulation results of the acoustic field around an underwater supercavitation vehicle under various operating conditions and analyzes the cavitation phenomenon and the hydrodynamic noise spectrum. Regarding the ventilated cavitation phenomenon, the simulation shows that low vehicle speed can reduce the threshold of the ventilated supercavitation, and high background pressure can enhance the stability of the supercavitation structure. As for hydrodynamic noise, firstly, the simulation results reveal that when cavitation occurs, the noise spectrum exhibits several characteristic peaks near 1 kHz and between 3 and 10 kHz. The overall noise amplitude demonstrates a descending trend between 10 and 40 kHz. Further, under natural cavitation conditions, a characteristic peak is detectable between 40 and 80 kHz. The influence of the operating conditions on the noise is essentially achieved by altering the scale of the cavitation flow: with the growth of the bubble flow scale, the noise between 3 and 10 kHz first increases and then decreases due to its own pulsation and the masking effect, while the noise between 10 to 40 kHz substantially reduces. On the other hand, if the scale expansion of bubble flow is related to the increase of ventilation flow, the noise amplitude near 1 kHz will increase significantly. These results provide theoretical support for studying the supercavitation vehicles’ noise and applying the ventilated supercavitation technology.

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Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of Supercavitation Vehicle’s Hydrodynamic Noise

Ye,

Zhang,

Wang

et al. 2023

JMSE

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show abstract

“…Many years ago, researchers carried out a series of scientific investigations into the motion characteristics of bubbles in liquids (Bhaga and Weber 1981, Logvinovitch 1969, Clift et al 1978, Coutanceau and Thizon 1981, Lauer et al 2012, and determined the dynamic behaviour of bubbles in different viscous liquids. Through further research, it was found that the ventilated cavity covering the surface of an underwater vehicle can effectively reduce the travelling resistance (Jiang et al 2019, Zou et al 2021, which provides a new direction of research into underwater vehicles. Kim and Kim (2015) further studied the hydrodynamic characteristics of ventilated supercavities and established a dynamic model for vehicles that produced this phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on unsteady entrainment behaviour of ventilated air mass in underwater vehicles

Qu,

Yang,

Yao

et al. 2023

Fluid Dyn. Res.

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The hydrodynamic characteristics of underwater vehicles are significantly affected by the ventilated cavity covered by the vehicle surface. In this paper, the unsteady flow characteristics of this ventilated cavity are studied using experimental and numerical methods, and the unsteady entrainment behaviour of the ventilated air mass is emphasised. The flow pattern of the ventilated air mass is recorded using a high-speed camera. The large eddy simulation turbulence model is employed for the numerical simulations, and a good agreement is observed between the experimental and numerical results. In the early stage of the formation of the ventilated air mass, the internal structure exhibits a symmetric kidney vortex system, while the ventilated cavity below the vent hole has a continuous hairpin vortex structure. The ventilated air mass experiences a growth stage, an entrainment stage, and a shedding stage. The entrainment behaviour enables the ventilated air mass to quickly fill the ventilated cavity and modifies the surface pressure distribution of the vehicle. As the cavitation number decreases, the radial size of the ventilated cavity increases, and the contact area between the cavity and the water body increases, thus enhancing the vertical drag coefficient of the vehicle.

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“…H. Forouzani et al [6] simulated the supercavitation dynamics and planing force through two mathematical models based on experiments and established the motion equation of a supercavitating projectile. Jiang et al [7] investigated the drag characteristics and flow physics of ventilated supercavitating objects with two different forebodies and three different rear bodies through cavitation tunnel experiments.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation into the Tail-Slapping Motion of a Projectile with an Oblique Water-Entry Speed

Lu,

Gao,

et al. 2023

JMSE

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In this study, the tail-slapping behavior of an oblique water-entry projectile is investigated through high-speed photography technology. The experimental images and data are captured, extracted and processed using a digital image processing method. The experimental repeatability is verified. By examining the formation, development and collapse process of the projectile’s cavity, this study investigates the impact of the tail-slapping motion on the cavity’s evolution. Furthermore, it examines the distinctive characteristics of both the tail-slapping cavity and the original cavity at varying initial water-entry speeds. By analyzing the formation, development and collapse process of the cavity of the projectile, the influence of the tail-slapping motion on the cavity evolution is explored. Furthermore, it examines the evolution characteristics of both the tail-slapping cavity and the original cavity under different initial water-entry speeds. The results indicate that a tail-slapping cavity is formed during the reciprocating motion of the projectile. The tail-slapping cavity fits closely with the original cavity and is finally pulled off from the surface of the original cavity to collapse. In addition, as the initial water-entry speed increases, both the maximum cross-section size of the tail-slapping cavity and the length of the original cavity gradually increase. With the increase in the number of tail-slapping motions, the speed attenuation amplitude of the projectile increases during each tail-slapping motion, the time interval between two tail-slapping motions is gradually shortened, the energy loss of the projectile correspondingly enlarges, and the speed storage capacity of the projectile decreases.

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Experimental investigation of drag characteristics of ventilated supercavitating vehicles with different body shapes

Cited by 51 publications

References 26 publications

A Numerical Investigation of Supercavitation Vehicle’s Hydrodynamic Noise

A Numerical Investigation of Supercavitation Vehicle’s Hydrodynamic Noise

Experimental and numerical study on unsteady entrainment behaviour of ventilated air mass in underwater vehicles

Experimental Investigation into the Tail-Slapping Motion of a Projectile with an Oblique Water-Entry Speed

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