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首页> 外文期刊>Particulate Science and Technology: An International Journal >Evaluation of a Backscatter Imaging LDV System and Its Application to a Pilot-Scale Circulating Fluidized Bed
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Evaluation of a Backscatter Imaging LDV System and Its Application to a Pilot-Scale Circulating Fluidized Bed

机译：背散射成像LDV系统的评估及其在中试循环流化床中的应用

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This study focuses on the evaluation and application of a backscatter imaging LDV (laser Doppler velocimeter) system (BILS) built by TSI Inc.(Shoreview,Minn.).This nonintrusive instrument has the ability to record particle images and velocity data simultaneously.A series of validation tests was conducted prior to measuring particle velocity in a turbulent system.A set of experiments was conducted to measure terminal velocity and particle size for five different-size cuts of near-spherical,Nu-Pareil particles,and the results were compared with the standard drag curve,which showed good agreement.The imaging data were used to estimate the sphericity (PHI) of the particles.The data confirmed that us was close to I (0.98 < PHI < 0.99,).The system was then used to measure particle velocity in a cold flow circulating fluidized bed at various operating conditions.The effect of operating conditions,such as superficial gas velocity and solids circulation rate,on the solids velocity was studied.The mean solids velocity near the wall was found to increase with increasing superficial gas velocity and decreasing solids circulation rate.The granular temperature was also estimated and was found to increase with increasing distance from the wall.The granular temperature was found to lie in the range of 0.1-1.0 m~2/s~2 for the operating conditions studied.The granular temperature calculations also showed that the flow of particles moving downwards was more ordered than the flow moving up.
机译：本研究的重点是由TSI Inc.（Shoreview，Minn。）建造的背向散射成像LDV（激光多普勒测速仪）系统（BILS）的评估和应用，该非侵入式仪器能够同时记录粒子图像和速度数据。在测量湍流系统中的粒子速度之前进行了一系列验证测试。进行了一组实验，以测量五个不同尺寸的近球形Nu-Pareil粒子的最终速度和粒径，并将结果进行了比较用标准拖曳曲线，显示出良好的一致性。使用成像数据估算颗粒的球形度（PHI），数据证实我们接近I（0.98

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