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On the interfacial instabilities of a ventilation cavity induced by gaseous injection into liquid crossflow

Published online by Cambridge University Press:  06 February 2024

Chengwang Xiong Open the ORCID record for Chengwang Xiong [Opens in a new window] ,
Shengzhu Wang ,
Qianqian Dong ,
Shi-Ping Wang  and
A-Man Zhang Open the ORCID record for A-Man Zhang [Opens in a new window]
Chengwang Xiong
Affiliation:
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, PR China
Shengzhu Wang
Affiliation:
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, PR China Marine Design and Research Institute of China, Shanghai 200011, PR China
Qianqian Dong
Affiliation:
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, PR China College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, PR China
Shi-Ping Wang
Affiliation:
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, PR China
A-Man Zhang*
Affiliation:
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, PR China
*
†Email address for correspondence: zhangaman@hrbeu.edu.cn
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Abstract

This study gives insights into the interfacial instabilities of a ventilation cavity by injecting gas vertically into the horizontal liquid crossflow through both numerical and experimental investigations. We identified four distinct regimes of the ventilation cavity based on their topological characteristics: (I) discrete bubble, (II) continuous cavity, (III) bifurcated cavity, and (IV) bubble plume. The boundaries for these regimes are delineated within the parameter space of crossflow velocity and jet speed. A comprehensive analysis of the flow characteristics associated with each regime is presented, encompassing the phase mixing properties, the dominant frequency of pulsation, and the time-averaged profile of the cavity. This study conducted a detailed investigation of the periodic pulsation at the leading-edge interface of the cavity, also known as the ‘puffing phenomenon’. The results of local spectral analysis and dynamic mode decomposition indicate that the high-frequency instability in the near-field region exhibits the most significant growth rate. In contrast, the low-frequency mode with the largest amplitude spans a broader region from the orifice to the cavity branches. A conceptual model has been proposed to elucidate the mechanism behind the pulsation phenomenon observed along the cavity interface: the pulsation results from the alternate intrusion of the crossflow and the cavity recovery at the leading edge, being governed mainly by the periodic oscillating imbalance between the static pressure of gas near the orifice and the stagnation pressure of crossflow at the leading edge.

JFM classification

Drops and Bubbles: Cavitation

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JFM Papers
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Journal of Fluid Mechanics , Volume 980 , 10 February 2024 , A44
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© The Author(s), 2024. Published by Cambridge University Press

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Supplementary material: File

Xiong et al. supplementary movie 1

The animation of bubble development in DB regime, corresponding to case 4 in Table 1.
Download Xiong et al. supplementary movie 1(File)
File 24.6 MB
Supplementary material: File

Xiong et al. supplementary movie 2

The experimental and numerical obserbvations of interface instability in BC regime, corresponding to the cases shown in figure 15 and 14(a), respectively.
Download Xiong et al. supplementary movie 2(File)
File 13.4 MB
Supplementary material: File

Xiong et al. supplementary movie 3

The comparison of cavity topology develoment with an incresse of jet velocity, corresponding to figure 24.
Download Xiong et al. supplementary movie 3(File)
File 31.7 MB