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首页> 外文期刊>Ocean Engineering >Experimental investigation of ventilated partial cavitating flows with special emphasis on flow pattern regime and unsteady shedding behavior around an axisymmetric body at different angles of attack
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Experimental investigation of ventilated partial cavitating flows with special emphasis on flow pattern regime and unsteady shedding behavior around an axisymmetric body at different angles of attack

机译：通风的部分空化流的实验研究，特别侧重于不同攻角的流型状态和轴对称体周围的非稳态脱落行为

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摘要

The objective of this paper is mainly to investigate the ventilated partial cavitating flow structure at different angles of attack with experimental methods. A high-speed camera technique is used to record cavity evolution patterns. The numerical simulation is performed by CFX Solver with a free surface model and filter-based turbulence model. Three flow pattern maps are constructed to depict the flow pattern and structures at different angles of attack alpha, i.e. the range of Froude number Fr and gas entrainment coefficient C-Q. The maps show that the angle of attack alpha has a significant effect on ventilated cavitating flow structures. With the increasing value of alpha, the asymmetry of ventilated cavity becomes obvious and the angle between the axis of the body and the closure line theta is decreased. The value of the included angle theta is found to vary with Fr number and C-Q. The cavity break-off may be mainly determined by the momentum and the direction of re-entrant jet flow.
机译：本文的目的主要是通过实验方法研究不同迎角条件下的通风部分空化流结构。高速相机技术用于记录腔体演化模式。数值模拟由CFX Solver使用自由表面模型和基于滤波器的湍流模型进行。构造了三个流动模式图，以描绘在不同迎角α时的流动模式和结构，即弗洛德数Fr的范围和气体夹带系数C-Q。这些图表明，迎角α对通风的空化流结构具有重要影响。随着α值的增加，通气腔的不对称性变得明显，并且身体轴线与闭合线theta之间的角度减小。发现夹角θ的值随Fr数和C-Q而变化。空腔破裂主要取决于动量和折返射流的方向。

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  • 来源
    《Ocean Engineering》 |2018年第1期|289-303|共15页
  • 作者

    Liu Taotao; Huang Biao; Wang Guoyu; Zhang Mindi;

  • 作者单位

    Beijing Inst Technol, Sch Mech & Vechicular Engn, 5 South Zhongguancun St, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mech & Vechicular Engn, 5 South Zhongguancun St, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mech & Vechicular Engn, 5 South Zhongguancun St, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mech & Vechicular Engn, 5 South Zhongguancun St, Beijing 100081, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ventilated partial cavitation; Flow pattern; Angle of attack; Shedding;

    机译：通风的部分空化;流动模式;攻角;脱落;

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