附着空化流动数值模拟方法的研究【荐】.pdfVIP

附着空化流动数值模拟方法的研究 李 军，刘立军，丰镇平 西安交通大学 能源与动力工程学院 西安 710049 中国 摘要：发展了基于液相/气相界面跟踪方法和Reynolds-Averaged Naver-Stokes （RANS ）方程耦合求解技术 的附着空化流动数值模拟方法。数值模型是设定计算区域的液相/气相界面是自由边界且计算液相单相流 场，通过提出的附着空化空泡形状修正格式来计算修正液相/气相界面直到界面处的压力等于当地气相压 力。空化空泡的起始点、空泡长度通过迭代计算得到。数值模拟了水下圆锥形头部圆柱体在2 种空化系数 下附着空化空泡形状和空化空泡表面压力系数分布，与试验数据吻合良好。验证了所发展的基于液相/气相 界面跟踪方法和RANS 方程求解技术的空化模型和算法具有良好的空化流动特性模拟性能。 关键词：附着空化；液相/气相界面跟踪方法；数值模拟 Study on the Numerical Simulation Method of the Attached Cavitating Flows Jun LI, Lijun LIU, Zhenping FENG School of Energy Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China Abstract: Numerical simulation method of the attached cavitation flow based on the liquid/vapor interface tracking method and Reynolds-Averaged Navier-Stokes (RANS) solution is developed. The vapor/liquid interface is treated as a free surface boundary in the computation domain. The attached cavitation bubble shape is determined using an iterative procedure matching the cavity surface to a constant pressure boundary. The pressure distribution, as well as its gradient on the wall, is taken into account in updating the cavity shape iteratively. The initial point and cavity length of the attached cavitation bubble is obtained using the iterative computation. The presented cavitation model and algorithm has been well validated by comparison of the computations against the experimental data available for the external flows of a cone/cylinder body under two cavitation coefficients. The attached cavitation bubble shape and corresponding pressure distribution along the liquid/vapor interface is calculated using the presented method. The feasibility and accuracy of the presen