喷水式超声检测的声−流耦合模型  

Modeling of acousto-fluid interaction in water-jet ultrasonic testing

作　　者：董明[1,2] 贾浩驰 陈渊 曹现刚 张广明[2,3] 万翔 DONG Ming;JIA Haochi;CHEN Yuan;CAO Xiangang;ZHANG Guangming;WAN Xiang(School of Mechanical Engineering,Xi’an University of Science and Technology,Xi’an 710054;Shaanxi Key Laboratory of Mine Electromechanical Equipment Intelligent Detection and Control,Xi’an 710054;General Engineering Research Institute,Liverpool John Moores University Liverpool,England L33AF)

机构地区：[1]西安科技大学机械工程学院,西安710054 [2]陕西省矿山机电装备智能检测与控制重点实验室,西安710054 [3]利物浦约翰摩尔斯大学通用工程研究所,英国利物浦L33AF

出　　处：《声学学报》2024年第5期1091-1098,共8页Acta Acustica

基　　金：国家自然科学基金项目(51705418,52175518);陕西省自然科学基础研究计划陕煤联合基金项目(2021JLM-07)资助。

摘　　要：为研究超声波在射流水柱中的传播特性,提出了喷水式超声检测的声−流耦合建模方法。使用计算流体动力学方法得到喷水探头内部流场的湍动能、速度和压力,并通过弱形式偏微分方程将其映射到声学网格作为声场分析的边界条件,用线性纳维−斯托克斯方程求解湍动能、流速等引起的声学变化,建立了喷水式超声检测的声−流耦合模型。仿真计算了不同流速时工件内部的声压分布,进水口流速的变化不会改变工件中声压的分布规律,但空间声压幅值随着流速的增大而减小。仿真计算了不同流速时的平底孔回波,回波幅值随着流速的增大而减小,通过与实验结果对比,验证了本文方法的准确性。A method for modeling of acousto-fluid interaction in water-jet ultrasonic testing is proposed to study the ultrasonic wave propagation characteristics in the water jet.The flow field of a water-jet probe is numerically calculated using computational fluid dynamics(CFD).The CFD results,including turbulent kinetic energy,flow velocity and pressure,are transferred to acoustic meshes as boundary conditions using weak formulations of the partial differential equations.The linear Navier-Stokes equations are used to solve for the acoustic changes caused by turbulent kinetic energy and flow velocity,thus modeling the acousto-fluid interaction in water-jet ultrasonic testing.Numerical calculations of the sound pressure distribution in the workpiece at different flow velocities are performed using the acousto-fluid interaction model.The results show that the sound field distribution is similar,but as the flow velocity increases,the pressure amplitude decreases.The echoes of the flat bottom hole are obtained using the proposed method and the echo amplitude decreases as the flow velocity increases.The accuracy of the proposed method is validated by comparison with experimental measurement results.

关 键 词：喷水式超声检测 声流耦合 网格映射 计算流体动力学 

分 类 号：TB553[理学—物理]