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浙江大学学报(工学版)
浙江大学学报(工学版)  2024, Vol. 58 Issue (5): 1040-1049    DOI: 10.3785/j.issn.1008-973X.2024.05.017
机械工程     
驻留式微气泡阵列流动减阻机理数值研究
朱睿1,2(),何星宇1,赵晨鸿1,刘宇2,张焕彬1,陈腾飞1,谭鑫1,刘志荣1,*()
1. 厦门大学 航空航天学院，福建 厦门 361005
2. 西藏民族大学 信息工程学院，陕西 咸阳 712082
Numerical study on flow-drag-reduction mechanism of resident microbubble array
Rui ZHU1,2(),Xingyu HE1,Chenhong ZHAO1,Yu LIU2,Huanbin ZHANG1,Tengfei CHEN1,Xin TAN1,Zhirong LIU1,*()
1. School of Aerospace Engineering, Xiamen University, Xiamen 361005, China
2. Information Engineering School, Xizang Minzu University, Xianyang 712082, China
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摘要：

为了完善驻留式微气泡阵列减阻的机理理论，基于有限体积方法，采用大涡模拟（LES）方法对平板及驻留微气泡阵列近壁面复杂湍流流动开展数值模拟研究，采用本征正交分解法(POD)提取2种模型近壁区湍流拟序结构进行对比分析. 结果表明：相较于平板，驻留微气泡阵列近壁面切应力变化更加平稳，减小了约13.7%；微气泡气/水界面的动态形变使边界层间歇性流动分离再附着，抑制低速流体上抛、高速流体下扫形成的“猝发”现象，湍流相干结构“猝发”频率减小5.6 Hz. 利用POD方法，能够有效地提取近壁面复杂湍流拟序结构的主要分布特征，微气泡的存在加强了湍流近壁区内的小尺度结构，促进流场内湍流动能的均匀分布，抑制了拟序结构的发展，体现了驻留微气泡良好的减阻特性.
关键词： 湍流;  驻留微气泡;  减阻;  本征正交分解    
Abstract:

A numerical simulation study was conducted using the finite volume method and large eddy simulation (LES) method to analyze the complex turbulent flow near the wall of a flat plate and with the resident microbubble array in order to improve the theoretical mechanism of drag reduction by the resident microbubble array. The proper orthogonal decomposition (POD) method was used to extract and compare the near-wall turbulent quasi-coherent structure. Results showed that the wall shear stress of the resident microbubble array was more stable and decreased by 13.7% approximately compared with the flat plate. The dynamic deformation of the gas/liquid interface of the microbubbles caused intermittent flow separation and reattachment in the boundary layer, which suppressed the "bursting" phenomenon of low-speed fluid upcast and high-speed fluid down-sweep, leading to a 5.6 Hz reduction in the bursting frequency of turbulent coherent structures. The POD method can effectively extract the main distribution characteristics of the near-wall turbulent quasi-coherent structures. The presence of microbubbles strengthens the small-scale structure in the near-wall turbulent region, promoting a more homogeneous distribution of turbulent kinetic energy within the flow field, suppressing the development of quasi-coherent structure and demonstrating the good drag-reduction property.
Key words: turbulence    resident microbubble    drag-reduction    proper orthogonal decomposition
收稿日期: 2023-05-14 出版日期: 2024-04-26
CLC:  U 674  
基金资助: 中央军委国防创新科技计划资助项目(22TQ2218TS01006)；福建省自然科学基金资助项目(2022J01058)；厦门市自然科学基金资助项目(3502220227179)；气动噪声控制重点实验室基金资助项目(2201ANCL20220105)；西藏民族大学校内科研项目(23MDY03).
通讯作者: 刘志荣     E-mail: zhurui@xmu.edu.cn;1zr1222@126.com
作者简介: 朱睿（1980—），男，副教授，博导，从事实验/计算流体力学、微气泡减阻的研究. orcid.org/0000-0002-4431-5325. E-mail：zhurui@xmu.edu.cn
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引用本文:

朱睿,何星宇,赵晨鸿,刘宇,张焕彬,陈腾飞,谭鑫,刘志荣. 驻留式微气泡阵列流动减阻机理数值研究[J]. 浙江大学学报(工学版), 2024, 58(5): 1040-1049.

Rui ZHU,Xingyu HE,Chenhong ZHAO,Yu LIU,Huanbin ZHANG,Tengfei CHEN,Xin TAN,Zhirong LIU. Numerical study on flow-drag-reduction mechanism of resident microbubble array. Journal of ZheJiang University (Engineering Science), 2024, 58(5): 1040-1049.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2024.05.017    或    https://www.zjujournals.com/eng/CN/Y2024/V58/I5/1040

图 1  平板及驻留微气泡的计算域与网格划分
图 2  平板湍流边界层内法向平均速度与试验数据的对比
图 3  LES与DNS湍流脉动强度的对比
图 4  平板及微气泡阵列表面壁面切应力分布
图 5  上抛、下扫猝发[30]
图 6  不同时刻平板湍流边界层流向速度场
图 7  不同时刻微气泡阵列表面流向速度云图
图 8  不同时刻平板及微气泡阵列表面速度演化
图 9  平板及微气泡阵列表面法向速度频谱图
图 10  平板及微气泡阵列表面湍动能演化
图 11  0阶模态/平均流场
图 12  各阶总能量累积分布曲线
图 13  各阶能量占比变化曲线
图 14  平板湍流边界层的模态云图
图 15  微气泡阵列表面湍流边界层的模态云图
图 16  局部微气泡阵列表面湍流边界层的模态云图
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