两相沉降涡及其流固振动特性的数值建模和实验研究

Zichao Yin, Y. Ni, Lin Li, Tong Wang, Jiafeng Wu, Zhe Li, Da-peng Tan
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引用次数: 4

摘要

沉降涡流是连铸、化学萃取、水利等工业生产过程中常见的物理现象,往往会对生产造成破坏和损失。因此,实时监测沉降涡状态对于提高工业生产效率非常重要。然而,其抽吸现象和形成过程中的冲击振动特性是流场状态监测的复杂机械动力学因素。针对这一问题,我们采用水平集法(LSM)建立了自由沉降漩涡的多物理场模型,以研究两相相互作用机理。然后,推导了流固耦合动力学模型,研究了冲击振动特性,揭示了临界流动状态的转换机制。数值结果表明,耦合能量冲击诱发了压力振荡现象,这似乎是涡流穿透状态下的瞬态振动增强。瞬态增强信号的中心部分是一个高频信号。在动态耦合模型的基础上,建立了一个实验观测平台来验证数值结果的准确性。水模型实验结果与数值结果一致。上述结果为工业监测系统中的流体状态识别和主动旋涡控制提供了参考,如航空航天管道运输、水力发电和微流控装置等。目 的 汇流旋涡的实时监测可有效促进冶金精炼、 燃料系统、 水力发电等工业场景的提质增效。本文旨在建立两相旋涡流固耦合模型, 获取壁面冲击振动信号和提取旋涡贯穿特征, 以期为工业防涡和抑涡提供理论参考与技术支持。创新点 1. 建立了涡流力学模型, 得到了临界贯入状态的规律; 2. 建立了流固耦合模型, 得到了涡激振动信号; 3. 提出了一种基于四方程的振动响应求解方法。方 1. 采用水平集方法, 建立自由汇流旋涡模型来研究气液两相作用机理; 2. 建立流固耦合动力学模型, 研究冲击振动特性, 并揭示临界流动状态的转变机理; 3. 搭建实验观测平台, 验证数值计算结果的准确性。根据流体动力学相似理论搭建的实验平台可基于冲击振动特性实现对汇流旋涡的实时监测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical modeling and experimental investigation of a two-phase sink vortex and its fluid-solid vibration characteristics
A sink vortex is a common physical phenomenon in continuous casting, chemical extraction, water conservancy, and other industrial processes, and often causes damage and loss in production. Therefore, the real-time monitoring of the sink vortex state is important for improving industrial production efficiency. However, its suction-extraction phenomenon and shock vibration characteristics in the course of its formation are complex mechanical dynamic factors for flow field state monitoring. To address this issue, we set up a multi-physics model using the level set method (LSM) for a free sink vortex to study the two-phase interaction mechanism. Then, a fluid–solid coupling dynamic model was deduced to investigate the shock vibration characteristics and reveal the transition mechanism of the critical flow state. The numerical results show that the coupling energy shock induces a pressure oscillation phenomenon, which appears to be a transient enhancement of vibration at the vortex penetration state. The central part of the transient enhancement signal is a high-frequency signal. Based on the dynamic coupling model, an experimental observation platform was established to verify the accuracy of the numerical results. The water-model experiment results were accordant with the numerical results. The above results provide a reference for fluid state recognition and active vortex control for industrial monitoring systems, such as those in aerospace pipe transport, hydropower generation, and microfluidic devices. 目 的 汇流旋涡的实时监测可有效促进冶金精炼、 燃料系统、 水力发电等工业场景的提质增效. 本文旨在建立两相旋涡流固耦合模型, 获取壁面冲击振动信号和提取旋涡贯穿特征, 以期为工业防涡和抑涡提供理论参考与技术支持. 创新点 1. 建立了涡流力学模型, 得到了临界贯入状态的规律; 2. 建立了流固耦合模型, 得到了涡激振动信号; 3. 提出了一种基于四方程的振动响应求解方法. 方 法 1. 采用水平集方法, 建立自由汇流旋涡模型来研究气液两相作用机理; 2. 建立流固耦合动力学模型, 研究冲击振动特性, 并揭示临界流动状态的转变机理; 3. 搭建实验观测平台, 验证数值计算结果的准确性. 结 论 1. 涡流耦合能量引起的压力振荡是流固冲击振动产生的根本原因; 2. 旋涡达到临界穿透状态时, 两相耦合引起的压力振荡导致各频率信号显著增强, 且高频波段尤为明显; 3. 根据流体动力学相似理论搭建的实验平台可基于冲击振动特性实现对汇流旋涡的实时监测.
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