液面位置对流-固交界面上伪瑞利波幅度影响的数值模拟  

Numerical simulation of the impact induced by liquid level on the amplitude of pseudo-Rayleigh waves at the fluid-solid interface

作　　者：刘拓[1,2] 乔文孝[1,2] 车小花[1,2] 赵玉宏 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]北京市地球探测与信息技术重点实验室,北京102249 [3]中国石油海外勘探开发公司,北京100044

出　　处：《声学学报》2013年第6期687-693,共7页Acta Acustica

基　　金：国家自然科学基金(11204380;11134011;61102102;11374371);国家油气重大科技专项(2011ZX05020-009);中国石油大学(北京)基金(KYJJ2012-05-13);中国石油天然气集团公司项目(2008A-2702;2011A-3903)资助

摘　　要：研究了流体半空间中存在气-液交界面并且其位置发生改变时,流-固交界面上伪瑞利波的传播特性和幅度响应特征。借助有限差分的方法,实现了对不同气-液交界面位置时振动方向垂直于流-固交界面的脉冲面源所激发表面波声场的数值模拟,分别讨论了气-液交界面自身的散射作用与伪瑞利波传播过程中的能量泄漏对伪瑞利波幅度的影响。数值模拟结果表明:气-液交界面自身对伪瑞利波的散射作用对伪瑞利波幅度仅有极微小的影响,而能量泄漏才是引起伪瑞利波衰减的决定性因素;随着气-液交界面位置的升高,脉冲伪瑞利波幅度呈指数规律下降,与此同时主频向低频偏移。所得研究结果可以发展为一种利用伪瑞利波幅度进行液位检测的可靠方法。A gas-liquid interface and its changes in position have impacts on the propagation and amplitude of pseudo- Rayleigh waves at the fluid-solid interface, which is studied in this paper. A numerical simulation （finite-difference method） is performed to model the surface wave of different gas-liquid interface position generated by a near-surface impulsive plane source in the solid with vibration direction perpendicular to the fluid-solid interface, through which the influence of scattering brought by the gas-liquid interface itself and the energy leak in the propagation process is discussed. The simulation result shows that, the influence of the scattering effect of gas-liquid interface itself very slightly contributes to the amplitude of pseudo-Rayleigh waves, and the predominant cause of attenuation is the energy leak; with the gas-liquid interface position increases, the amplitude of pseudo-Rayleigh wave pulse declines exponentially and its central frequency becomes lower. This result can be developed into a method for liquid level detection using the amplitude of pseudo-Rayleigh waves.

关 键 词：伪瑞利波 数值模拟 液面位置 交界面 幅度 对流 界面位置 能量泄漏 

分 类 号：O35[理学—流体力学]