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| 冲击挤压式脉冲射流动力特性数值模拟 |
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陆朝晖1,2,卢义玉1,夏彬伟1,刘勇1,葛兆龙1,左伟芹1
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(1. 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400030;2.国土资源部页岩气资源勘查重点实验室,重庆 400042)
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| 摘要: |
| 基于Fluent软件建立以流体体积函数(VOF)模型和Realizable k-ε湍动模型组合的二维多相流瞬态数值计算模型,采用定义瞬态压力入口边界的方法,对冲击挤压式脉冲射流的形成过程进行模拟计算。结果表明:基于此组合模型和方法计算得出的动态射流结构与试验结果具有较高的吻合度;喷嘴出口的水动力特征是影响射流结构及变化的最主要外在因素;射流前部生成的伞状结构能限制射流中心区表面气体涡的发展,有利于提高有效中心射流的收敛度; 射流前部轴心速度发展至最大时,射流前端形成一层厚度约为2倍喷嘴直径的低速高湍动层。 |
| 关键词: 射流 挤压式水射流 流体体积函数 Realizable k-ε模型 水动力特征 |
| DOI：10.3969/j.issn.1673-5005.2013.04.016 |
| 分类号::TE 921 |
| 基金项目:国家自然科学基金项目(50921063);重庆市自然科学基金重点项目(cstc2013jjB90005) |
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| Numerical simulation on hydrodynamic characteristics of percussion pulsed jet |
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LU Zhao-hui1,2, LU Yi-yu1, XIA Bin-wei1, LIU Yong1, GE Zhao-long1, ZUO Wei-qin1
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(1.State Key Laboratory of Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China;2.Key Laboratory of Shale Gas Exploration,Ministry of Land and Resources Engineering, Chongqing 400042, China)
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| Abstract: |
| Based on Fluent software, a two-dimensional transient computational fluid dynamic (CFD) model was established by combining volume of the fluid (VOF) model and Realizable k-ε model. The formation process of the percussion pulsed water jet was numerically simulated by defining transient pressure inlet boundary. The results show that the dynamic structure data of percussion water jet obtained by this model agree well with the experimental results. The outlet hydrodynamic characteristics are the most important factor affecting the jet structure and its change with time. The development of air vortexes on the central jet surface is restricted by the umbrella-shape structure which is beneficial to improve jet convergence. And a high turbulent zone with the size of two times jet diameter can be achieved when the axial velocity of the jet front edge reaches to its maximum magnitude. |
| Key words: jet percussion water jet volume of fluid Realizable k-ε model hydrodynamics characteristics |
