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flow-field analysis of a continuous gas-solid separation fluidized bed equipped with a moving scraper

Particuology 2021年第4期19卷 45-55页

作者： Bo Lv Xiaowei Deng Chaojun Fang Xiangnan Zhu College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China Henan Key Laboratory for Green and Efficient Mining&Comprehensive Utilization of Mineral Resources Henan Polytechnic UniversityJiaozuo 454000China School of Chemical&Environmental Engineering Shandong University of Science&TechnologyQingdao 266590China

Continuous gas-solid separation fluidized beds are one of the most widely used practical operation units for the dry separation of coal in China,particularly in Northwest China,and they can effectively promote the efficient and clean utilization of raw *** a continuous gas-solid separation fluidized bed,the bed flow field is the concrete manifestation of the fluidization ***,the complexity of the flow field increases under the action of a moving *** this study,a combination of computational fluid dynamics(CFD)simulations and experimental measurements was used to study the changes in the flow field of a fluidized *** results showed that when the scraper moved,the local flow field(mainly characterized by the movement of medium particles)near the scraper was affected not only by the common airflow or bubbles,but also by the lateral driving force of the *** the scraper speed was v_(l)flow *** flow field shifted to the right near the scraper,with the direction of the scraper movement,while the flow field exhibited a leftward trend on the surface of the bed,accompanied by some vortices,in the middle and lower parts of the ***,the critical height of the area,directly affected by the scraper,increased from 52 to 54 mm with an increase in its operating speed from v_(l)=2.96 cm/s to v_(l)=4.44 cm/s,*** provides a theoretical basis for further understanding the hydrodynamic characteristics of fluidized beds.

关键词： Simulation analysis Moving scraper flow-field Particle collision pressure Hydrodynamic characteristics

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Experimental technique based on delay phase of PZT vibrator and flow-field of PZT-driven dual synthetic jets actuator

Experimental technique based on delay phase of PZT vibrator ...

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2011年全国压电和声波理论及器件应用研讨会

作者： Zhen-bing LUO~* Xiong DENG Lin WANG Zhi-xun XIA College of Aerospace and Material Engineering,National University of Defense Technology,Changsha 410073

＜正＞There is a delay phase angle between the displacement signal and voltage signal of PZT-driven *** higher the driving frequency,the larger delay phase angle of the PZT vibrator will *** on the delay phase angle o... 详细信息

关键词： Experimental technique Delay phase PZT vibrator flow-field Dual synthetic jet actuator

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Experimental Investigation on Starting Process of Supersonic Single-stage Air Ejector

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Journal of Thermal Science 2012年第4期21卷 348-353页

作者： Zou Jian-jun Zhou Jin Lu Hui-qiang Hu Yong College of Aerospace and Material Engineering National University of Defense Technology Changsha 410073 China

This paper deals with experimental study of flow field of starting process in two-dimensional, single-stage supersonic ejector on different air total pressure. Schlieren pictures of flow field were taken, static pressure distribu-tions on side wall were measured. The obtained results show that, on critical pressure, the starting main shock waves in ejector oscillated back and forth between the second throat and the middle section of the mixing chamber, it causes the pressure in the second half of the mixing chamber acutely fluctuated .When the working pressure of the active flow is higher than the critical starting pressure, ejector starts normally and the inner flow-field of the mixing chamber keeps stable and the shock waves in the second throat have a certain degree of oscillation . After ejector starts, the operating pressure of the active flow may be lower than the starting pressure .

关键词： supersonic ejector start process flow-field shock waves

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