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Influence of opening ratios and directions of windows on natural smoke exhaust effect in atrium buildings

Building Simulation 2022年第4期15卷 571-582页

作者： Peng Wang Xiankun Wang Keheng Chen Hongyu Wei Qianhang Feng Yuanyi Xie Xuechao He Yanqiu Chen Department of Fire Protection Engineering Southwest Jiaotong UniversityChengduSichuan 610031China Sichuan Fire Research Institute of MEM China

In this paper,the influence of different opening ratios and different opening directions of the windows on the natural smoke exhaust was studied through a series of real fire experiments and simulation *** the open area of the window could effectively improve the overall smoke exhaust *** the top windows were open and the opening ratio increased from 19.2%to 24.3%,the optical density was decreased by 12.4%.The average smoke exhaust rate per unit area of the window did not change *** the area of the natural smoke exhaust window could effectively increase the smoke exhaust rate and improve the overall effect of smoke *** the top windows were open,the temperature rise on the top floor was 30.8%-47.5%lower while the visibility was 16.8%-21.9%higher than that when the side windows were open.

关键词： natural smoke exhaust atrium opening ratio opening direction

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Optimal design of gas distributor in fluidized bed for synthesis of silicone monomer

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Particuology 2023年第12期83卷 115-128页

作者： Shanlin Du Guoqiang Lv Wenhui Ma Guangkai Gu Boqiang Fu Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093China State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province Kunming650093China

The structure of the gas distributor is closely related to the production efficiency of organosilicon *** improve the production efficiency of organosilicon monomers,this study uses Eulerian-Eulerian two fluid model and proposes a design formula for the gas distributor to optimize the gas *** is proposed that the pressure drop of the gas distributor,the velocity nonuniformity coefficient,the relative standard deviation of the solid holdup,and the solid particle dispersion coefficient are used to evaluate the performance of the gas *** results show that the performance of the gas distributor is significantly improved when the opening ratioΦ=0.53%is optimized toΦ=0.18%,in which the relative standard deviation of the solid holdup is reduced by 22%,and the solid particle dispersion coefficient is reduced by 40%.On this basis,this article studies the influence of different arrangements of vent holes on gas-solid fluidization *** results show that the circular arrangement of vent holes is helpful to the mixing of gas and solid.

关键词： Fluidizedbed reactor Gas distributor opening ratio Arrangement

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Hydrodynamic Characteristics of Square Heaving Plates with opening Under Forced Oscillation

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China Ocean Engineering 2019年第6期33卷 637-648页

作者： CONG Long-fei TENG Bin State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

The existence of the heaving plates can improve the heaving motion performance of an offshore structure significantly by providing both extra added mass and *** the current research,numerical investigation is carried out on the hydrodynamic characteristics of both isolated square heaving plate and double square heaving plates with opening by an immersed boundary-lattice Boltzmann *** effects on hydrodynamic performance of plates due to Keulegan-Carpenter(KC)number,frequency number,opening ratio,opening distribution and spacing of plates are *** is found that the heaving plates with optimized opening ratio can provide additional damping compared with the plates without *** hydrodynamic characteristics of double plates can be obtained with the increase of plate spacing.

关键词： immersed boundary-lattice Boltzmann method square heaving plate opening shape opening ratio opening distribution plate spacing

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