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Fundamental research on the size and velocity measurements of coal powder by trajectory imaging

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第5期14卷 377-382页

作者： Xue-cheng WU Ying-chun WU Cong-chang ZHANG Guo-neng LI Qun-xing HUANG Ling-hong CHEN Kun-zan QIU Hao ZHOU Ke-fa CEN State Key Laboratory of Clean Energy Utilization Zhejiang University Institute for New Energy and Energy Saving Technology Zhejiang University of Science and Technology

A trajectory imaging based method for measuring the velocity and diameter of coal particles was *** using an industrial charge-coupled device(CCD)camera and a low power semiconductor laser,the images of coal particles under relatively long exposure time were recorded and then processed to yield both the velocities and *** research on this method with special attention to recording parameters,e.g.,magnification factor and exposure time,was carried *** most of the test cases,the results agree with those obtained by particle image velocimetry(PIV)and shadow imaging *** with good accuracy can be obtained when the imaging magnification factor and exposure time are set appropriately,making N be larger than 3.5,and R between 5-7,where N and R are the number of pixels occupied by the average width and the ratio of length to width of particle trajectory on the image,*** work indicates the feasibility and potential application of the present measurement method for online measurement of coal powder in pipes in industrial power plants.

关键词： trajectory imaging Velocity measurement Size measurement Coal powder

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Experimental study and numerical simulation of the characteristics of a percussive gas-solid separator

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Particuology 2018年第1期16卷 96-105页

作者： Xuecheng Wu Xiao Wang Yonggang Zhou State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

The presence of solid particles in the flow of hypersonic wind tunnels damages the appearance of the experiment models in the wind tunnel and influences the accuracy of experimental results. The design of a highly efficient gas-solid separator was therefore undertaken, Particle trajectory imaging methods were used to measure trajectories under different conditions. The flow field and particle movement characteristics for different head angles （HAs） and separation tooth angles （STAs）, inlet velocities, and the exhaust gas outlet pressures in the separator, were calculated using simulations based on the discrete phase model. The particle separation efficiency, pressure loss, and flow loss resulting from different structural parameters were also studied. In line with experimental observations, the characteristic angle of particle movements in the separator and the separation efficiency of the separator were found to increase with decreasing HA and with increasing STA. Separation efficiency improves with increasing inlet velocity and with increasing negative pressure of the exhaust gas outlet; however, the corresponding pressure loss and the flow rate of the waste gas also increased.

关键词： Gas-soIid separation trajectory imaging Collision of particles Numerical simulation Efficiency of separation

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