首页|绕钝体通气空泡流型和非定常行为特征研究

绕钝体通气空泡流型和非定常行为特征研究

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本文基于高速摄像和粒子图像测速技术(PIV)，开展了绕钝体通气空泡流型和非定常行为特征的实验研究。研究发现在给定通气量Q下，不同雷诺数的空泡流型变化呈现出明显的不同。当通气量Q=4。16 LPM时，随着雷诺数的改变，空泡流型相似，均体现为由于流动分离形成的通气空泡旋涡脱落特征。而当通气量为Q=16。67 LPM时，随着雷诺数的增加，空泡长度减小，由稳定的超空泡转变为大尺度脱落的空泡形态。分析发现，基于旋涡结构尺寸和脱落频率评估的旋涡结构泄气能力对空泡流型的转变发挥着重要的作用。此外，结合本征正交分解方法对旋涡结构进行分析，发现自然空化的出现会影响空泡脱落时间的变化，使得空泡旋涡脱落周期变得更加复杂。
On the topology and unsteady behavior of ventilated cavitating flow over a bluff body
The cavity topology and unsteady behavior of ventilated cavitating flow over a bluff body are investigated experimentally using high-speed imaging and particle image velocimetry measurements.It is observed that the cavity topology shows a distinct variation at different Reynold numbers(Re)for a given gas flow rate Q.For gas flow rate Q=4.16 litres per minute(LPM),the cavity topology is substantially the same at different Re,and the separated shear layer forms the basis for the cavity breakup and shedding vortices.However,for Q=16.67 LPM,the cavity length decreases,and the cavity topology changes from supercavity to large-scale shedding with the increasing of Re.According to the observations,the balance of gas injection and the gas leakage capacity of shedding vortices,which can be estimated by the cavitation vortex size and the vortex shedding frequency,determines the cavity topology.In addition,the proper orthogonal decomposition analysis indicates that the existence of natural cavitation in the ventilated cavitating flow mainly affects the temporal variation of shedding and makes the periodic change of vortex dynamic more complicated.

Ventilated cavitating flowVortex sheddingPOD

王志英、劳铁涛、燕国军、王静竹、王展、田文斌、王国玉、王一伟

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Key Laboratory for Mechanics in Fluid Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China

Beijing Institute of Astronautical Systems Engineering,Beijing 100076,China

College of Engineering,China Agricultural University,Beijing 100083,China

School of Mechanical and Vehicular Engineering,Beijing Institute of Technology,Beijing 100081,China

School of Future Technology,University of Chinese Academy of Sciences,Beijing 100049,China

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Ventilated cavitating flow Vortex shedding POD

2024

10.1007/s10409-024-24082-x

力学学报(英文版)

力学学报(英文版)

CSTPCD
影响因子：0.363
ISSN：0567-7718
年,卷(期)：2024.40(10)