CFD Analysis of High-speed Cavitating Water Jet and Hydraulic Design of Jet Nozzle

高速空化水射流CFD分析及喷嘴水力设计

• 批准号: 18560173
• 负责人: PENG Guoyi
• 金额: $ 2.34万
• 依托单位: Toyama Prefectural University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560173/
• 关键词: Submerged water jet; Cavitation; Flow cisualization; Numerical Simulation; 流体工学; 数理工学

A mixture-flow bubble-cavitation model is proposed for unsteady cavitating flow computation by coupling a Two-Fluid Three-Pressure bubble dynamics model and a compressible two-phase flow computation. The fluid media of cavitating flow is treated as a mixture of liquid and spherical gas bubbles, those are supposed to disperse in the liquid phase uniformly. The average bubble radius in a local flow field is calculated by Rayleigh-Plesset equation and cavitation is evaluated by the volume fraction of gas included in bubbles. State equations of liquid and gas phases are employed to define the compressibility of two-phase mixture and a set of mean flow governing equations is developed by phase-averaging. The method is applied to treat flows in an orifice nozzle as well as a venture nozzle and the reliability of computation results is confirmed.

通过耦合二流体三压力气泡动力学模型和可压缩两相流计算，提出了用于非定常空化流计算的混合流气泡空化模型。空化流的流体介质被视为液体和球形气泡的混合物，这些气泡均匀地分散在液相中。通过Rayleigh-Plesset方程计算局部流场中的平均气泡半径，并通过气泡中所含气体的体积分数来评价空化。采用液相和气相的状态方程来定义两相混合物的压缩性，并通过相平均建立一组平均流量控制方程。将该方法应用于孔板喷嘴和文丘里喷嘴内的流动处理，验证了计算结果的可靠性。

项目成果

A Pressure-based Two-phase Flow Method for Computation of Bubble Cavitation Flows

计算气泡空化流的基于压力的两相流方法

• 发表时间: 2007
• 作者: G.Peng;R.Egashira;T.Yano and S.Fujikawa
• 通讯作者: T.Yano and S.Fujikawa

Numerical Study of Cavitating Turbulent Flows in a Starting Submerged Water Jet

启动浸没水射流中空化湍流的数值研究

• 发表时间: 2006
• 作者: G. Peng;S. Fujikawa
• 通讯作者: S. Fujikawa