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| 淹没条件下水射流涡旋特性大涡模拟及实验研究 |
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张欣玮1,2,汤积仁1,2,卢义玉1,2,周哲1,2,章文峰1,2,陈钰婷1,2
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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.重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆 400030)
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| 摘要: |
| 采用大涡模拟方法对淹没条件下水射流的涡量场进行数值模拟,分析流场中涡旋的产生与扩散机制,并通过相同条件下粒子图像测速仪测量射流的涡量场,对模拟结果和方法进行验证。模拟研究泵压和围压对淹没射流涡旋特性的影响。结果表明:在射流流场中,由喷嘴出口产生一系列涡量集中的点涡旋,随着射流的前进涡旋逐渐扩散,卷吸周围介质并传递能量,卷吸范围逐渐扩大,而卷吸能力沿射流轴向呈指数衰减;随着泵压升高,整个流场中涡旋的涡量值明显增大,涡旋扩散长度直线上升;围压对涡量基本没有影响,围压的增加会使涡旋扩散区长度直线下降,减小卷吸作用范围。 |
| 关键词: 淹没水射流 涡旋 大涡模拟 粒子成像测速 |
| DOI：10.3969/j.issn.1673-5005.2015.03.013 |
| 分类号::TE 319 |
| 基金项目:国家“973”计划项目(2014CB239206)；国家自然科学基金青年基金项目(51404045)；教育部长江学者和创新团队发展计划(IRT13043)；国家自然科学基金项目(51104191)；重庆市博士后科研人员特别资助项目(Xm2014036) |
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| Large eddy simulation and experimental study on vortex characteristics of water jet in submerged condition |
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ZHANG Xinwei1,2, TANG Jiren1,2, LU Yiyu1,2, ZHOU Zhe1,2, ZHANG Wenfeng1,2, CHEN Yuting1,2
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(1.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China;2.National ＆ Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400030, China)
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| Abstract: |
| The large eddy simulation was used to numerically simulate the vorticity field of submerged water jet in submerged condition, through which the mechanism of vortex generation and diffusion in the flow field was analyzed. And the simulation results and methods were validated using the particle image velocimetry (PIV) measurement test of vorticity field under the same conditions. In this way the effect of pump pressure and confining pressure on vortex characteristics of submerged jet were studied. The results show that a series of point vortexes with large vorticity are generated by the nozzle exit in the jet flow field. With the progress of jet development, vortexes spread gradually and entrain the surrounding medium to transfer energy, which causes the scope of entrainment expanded gradually and the entrainment ability decayed exponentially along the jet axis. With the pump pressure increasing, the vorticity of entire flow field increases significantly and the length of vortex diffusion climbs straight. While confining pressure has no effect on the magnitude of the vorticity, and the increase of confining pressure leads to reduce the length of the vortex diffusion. |
| Key words: submerged water jet vortex large eddy simulation particle image velocimetry |
