摘要
基于边界数据浸入法,在非贴体笛卡尔网格环境下结合隐式大涡模拟构建了绕带空化器复杂回转体外形下的通气空泡多相流动数值求解器,通过与实验结果对比,验证了数值方法在计算复杂回转体外形通气空泡时的准确性和有效性,并开展了不同通气率下的通气空泡数值计算分析.结果表明:通气率的改变对回转体空泡形态和漩涡结构的演变具有显著影响,通气率的增大会使空泡形态重力效应更加明显,回转体近壁面速度梯度减小,环状涡结构更快地发生断裂与脱落;拟涡能和湍流动能输运也因通气率的改变使得各项能量的大小与分布产生相应变化,但能量的产生与耗散始终维持着动态平衡.
Based on the boundary data immersion method(BDIM),a numerical solver for multiphase ventilated cavitation flow around complex axisymmetric bodies with cavitators by combining implicit large-eddy simulation(ILES)with non-conformal Cartesian grids was developed.The numerical method’s accuracy and effectiveness in simulating ventilated cavitation around complex axisymmetric geometries were validated through experimental comparisons.Numerical simulations were then conducted to analyze ventilated cavitation under different ventilation rates.The results demonstrate that ventilation rate significantly affects the evolution of cavity morphology and vortex structures.Increasing ventilation rate enhances gravitational effects on cavity morphology,reduces near-wall velocity gradients of the axisymmetric body,and accelerates the breakup and shedding of annular vortex structures.Furthermore,variations in ventilation rate lead to corresponding changes in both magnitude and distribution of enstrophy and turbulent kinetic energy transport,while maintaining a dynamic balance between energy production and dissipation throughout the process.
作者
刘涛涛
徐腾云
吕亚飞
郝亮
黄彪
LIU Taotao;XU Tengyun;LÜYafei;HAO Liang;HUANG Biao(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401120,China;The System Design Institute of Mechanical-Electrical Engineering,Beijing 100074,China;Beijing Institute of Astronautical Systems Engineering,Beijing 100071,China)
出处
《北京理工大学学报》
北大核心
2025年第9期951-959,共9页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(U22B6010,52441903)
国家重点研发计划项目(2022YFB3303500)。
关键词
笛卡尔网格
空泡形态
拟涡能输运
湍流动能输运
Cartesian grid
cavity morphology
enstrophy transport
turbulent kinetic energy transport
