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| 1 | 典型流场测速技术应用研究进展显示文摘归纳了几种典型的流场测速技术测速原理、优缺点及应用研究进展,其中基于图像处理技术的新型测速技术有PIV、LDV、PDPA等。对比分析可知,多种基于各种测量原理的测速技术都可用,但每种测速技术无法达到各测量中理想的要求,在功能或适用流场上总会有弊端,流场测速时需要有效结合两种或多种方法,选定适合所测流场的测速技术才能进行高效率测量。最后对PIV、LDV今后的发展方向进行了展望。 | 金光 焦晶晶 吴晅 | 2015 | 矿山机械2015，43，12： | 11 |
| 2 | In-line imaging measurements of particle size,velocity and concentration in a particulate two-phase flow显示文摘A novel method is developed for in-line measurements of particle size, velocity and concentration in a dilute, particulate two-phase flow based on trajectory image processing. The measurement system consists of a common industrial CCD camera, an inexpensive LED light and a telecentric lens. In this work,the image pre-processing steps include stitching, illumination correction, binarization, denoising, and the elimination of unreal and defocused particles. A top-hat transformation is found to be very effective for the binarization of images with non-uniform background illumination. Particle trajectories measured within a certain exposure time are used to directly obtain particle size and velocity. The particle concentration is calculated by using the statistics of recognized particles within the field of view. We validate our method by analyzing experiments in a gas-droplet cyclone separator. This in-line image processing method can significantly reduce the measurement cost and avoid the data inversion process involved in the light scattering method. | Xiaozhen Chen Wu Zhou Xiaoshu Cai Mingxu Su Hailong Liu | 2014 | Particuology2014，12，2： | 10 |
| 3 | Rotation characteristic and granular temperature analysis in a bubbling fluidized bed of binary particles显示文摘In this work,a discrete particle model(DPM) was applied to investigate the dynamic characteristics in a gas-solid bubbling fluidized bed of binary solid particles.The solid phase was simulated by the hardsphere discrete particle model.The large eddy simulation(LES) method was used to simulate the gas phase.To improve the accuracy of the simulation,an improved sub-grid scale(SGS) model in the LES method was also applied.The mutative Smagorinsky constant case was compared with the previously published experimental data.The simulation by the mutative Smagorinsky constant model exhibited better agreement with the experimental data than that by the common invariant Smagorinsky constant model.Various restitution coefficients and different compositions of binary solids were investigated to determine their influences on the rotation characteristics and granular temperatures of the particles.The particle translational and rotational characteristic distributions were related to certain simulation parameters. | Tianyu Wang Yurong He Shengnan Yan Dong Rip Kim | 2015 | Particuology2015，13，1： | 2 |
| 4 | 河工模型表面流场的局部特征测量方法显示文摘为了解决当前河工模型表面流场的计算机视觉测量方法中摄像机安装过程繁琐、测量精度低、测量成本高等问题,提出了一种利用局部特征来实现表面流场测量的新方法。该方法以自由视角安装摄像机,无需垂直向下。在测量时,首先在流场表面布撒碎纸屑示踪粒子,然后对获取到的视频进行校正和鸟瞰图重建,得到待测流场的俯视图,再利用局部特征的图像匹配方法来得到流场的稠密速度矢量,最后对表面流场进行优化输出。根据测试,该方法在模型流速0.01~0.5m/s时,流速误差低于10%;在模型流速0.5~1.5m/s时,流速误差低于5%。综上所述,提出的方法在测量精度、测量成本和易用性方面均优于现有的测量方案,目前已经在向家坝长河段等大型河工模型分析测量中得到应用。 | 郑静 张伟 李正浩 刘家玮 唐永亮 杨美玲 | 2018 | 重庆大学学报(自然科学版)2018，41，11： | 1 |
| 5 | 喷动流化床内颗粒团聚结构与分布规律研究显示文摘为揭示湍动流化过程中颗粒团聚的基本结构,课题组基于矩形喷动流化床对B类颗粒进行试验研究。该实验平台利用控制变量法分析了操作条件、颗粒性质和沿层高度对团聚现象的影响,并提出以颗粒团聚分率来量化颗粒团聚程度。结果表明:床内分别出现了倒U形、U形、环核型、带状和网状5种典型的颗粒团聚结构;颗粒团聚分率随静止床高、颗粒直径的增加而增大;固定总表观气速,增大喷动气速,团聚分率呈现先减小后增大趋势;增大喷口宽度,团聚分率呈现出“S”型变化趋势;其沿床高则表现出先减小后增大的趋势。该研究对应用湍动流化气固流动结构的工业生产过程提供了实验依据。 | 李旺 王东祥 付爽 | 2023 | 轻工机械2023，41，4： | 0 |
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