基于改进PIV技术的库区滑坡涌浪试验研究

Experimental study on landslide generated waves based on improved PIV technique

针对滑坡涌浪试验中内部运动场数据缺乏的问题,采用改进的粒子图像测速技术搭建滑坡涌浪试验平台,选取理想黏塑性材料卡波普作为滑坡材料,通过示踪粒子荧光染色技术对滑坡体和水体两相进行区分,实现了两相内部流态的同步观测,并解析出相应的速度场矢量图,进而基于速度场数据计算了入水滑坡体质量和平均速度的变化曲线,并分析了两相耦合过程中的动量变化过程线。研究结果表明滑坡和水体两相的动量变化趋势与滑坡体入水动量具有较高的相关性,可为两相耦合的动量转换机理理论研究提供更加复杂、多元的数据支撑。

Aiming at the problem of data lacking for internal dynamics in landslide surge tests,an improved particle image velocimetry technology was used to build a landslide surge test platform.A viscoplastic material called Carbopol was chosen as the landslide material.Using fluorescence seeding particles,the internal dynamics of the submerged sliding mass and body of water was obtained respectively,and then the velocity field of the two phases was estimated.Using the velocity field data,the evolution of the mass and mean velocity of the submerged sliding mass,as well as the momentum variation of the sliding mass and body of water were calculated and analyzed.The results show that there is a high correlation between the momentum change trend of landslide and water body and the momentum of landslide body entering water,providing more complex and multivariate data support for the theoretical research of momentum transformation mechanism of two-phase coupling.