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characteristics of a coherent jet enshrouded in a supersonic fuel gas

International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 173-180页

作者： Fei Zhao Rong Zhu Wen-rui Wang Key Laboratory of Fluid Interaction with Material University of Science and Technology BeijingBeijing 100083China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Engineer University of Science and Technology BeijingBeijing 100083China

Based on a current coherent jet,this study proposes a supersonic combustion(SC)coherent jet in which the main oxygen jet is surrounded by a supersonic fuel *** characteristics of the proposed coherent jet are analyzed using experimental methods and numerical simulations in the high-temperature environment of electric arc furnace(EAF)*** SC coherent jet achieved stable combustion in the EAF steelmaking *** simulated combustion temperature of the supersonic shrouding methane gas was 2930 K,slightly below the theoretical combustion temperature of methane–oxygen *** high speed and temperature of the supersonic flame effectively weakened the interaction between the main oxygen jet and the external ambient gas,inhibiting the radial expansion of the main oxygen jet and maintaining its high speed and low turbulence over a long *** features improved the impact capacity of the coherent jet and strengthened the stirring intensity in the EAF bath.

关键词： EAF steelmaking coherent jet supersonic shrouding fuel gas supersonic combustion field characteristics

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Numerical simulation and experimental study on eggshell membrane separation device

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International Journal of Agricultural and Biological Engineering 2019年第2期12卷 173-183页

作者： Yuan Chi Yong Wang Mengfu Li Jie Ren Yujie Chi College of Engineering Northeast Agricultural UniversityHarbin 150030China College of Food Science Northeast Agricultural UniversityHarbin 150030China

In order to provide theoretical guidance for separating egg membrane from eggshell by using mechanical agitation,CFD was used to explore the flow characteristics in stirred tank,using the Sliding Grid method to deal with the impeller rotational velocity zone in flow field,and using the Euler model to deal with liquid-solid two-phase *** study explored the influence of dish-shape bottom or flat-shape bottom,the clearance size between baffle and the side wall,and the axial height of impeller to bottom on suspension state of particles,solids holdup distribution,solid phase velocity and power number by *** results showed that better particles suspension effect in dish-shape tank can reduce particles accumulation at the bottom and power *** there was a small clearance size(S)between the baffle and the side wall of the stirred tank,it would reduce particles accumulation at the bottom,and reduce the power ***,too large S would decrease the suspension height of particles,not only cannot strengthen the main flow,but also lead to most fluid through clearance forming tangential flow,simulation results showed that S=6 mm was *** decreased axial height of impeller(C)to bottom,particles accumulation at the bottom was decreased,but power consumption would increase,simulation results showed that C=H/5(H is height of liquid surface)was *** to the simulation results,the structure of the stirring tank was *** the same time,the influences of stirring rotational velocity,stirring time,solid-liquid ratio and separating medium temperature on egg membrane recovery were also studied by experiment,and optimal parameter combination of factors was *** experiment results showed while the stirring time was 17.1 min,stirring rotational velocity was 350 r/min,solid-liquid ratio was 1:17 g/mL,the separating medium temperature was 32℃,the membrane recovery rate can reach above 89%.The device improves the recovery a

关键词： liquid-solid two-phase flow mechanical stirring field characteristics eggshell membrane separation

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