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Effect of Gas blowing on the head of thermal ablation vehicle

Advances in Aerodynamics 2022年第1期4卷 188-202页

作者： Qing Li Xianxu Yuan Jianqiang Chen Lin Bi State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang621000China Computational Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang621000China

The reentry vehicle will encounter thermal ablation,especially at the stagnation point regime.A theoretical work has been done to analyze the thermal effect of Gas blowing due to thermal ablation of surface material on the head of a general hypersonic vehicle.By deriving the formulation,research takes into account the effect of Gas blowing on the thermal dynamics balance,and then solves them by numerical discretization.It is found that Gas blowing will increase the temperature and heat flux at the surface of stagnation point regime.

关键词： Stagnation point flow Viscous compression of fluid parcel Gas blowing

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Size analysis of slag eye formed by Gas blowing in ladle refining

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Journal of Iron and Steel Research(International) 2017年第3期24卷 243-250页

作者： Ning-ning Lv Liu-shun Wu Hai-chuan Wang Yuan-chi Dong Chang Su School of Metallurgical Engineering Anhui University of Technology Ma'anshan 243032 Anhui China Key Laboratory of Metallurgical Emission Reduction & Resources Recycling Ministry of Education Ma' anshan 243002 AnhuiChina

The formation of slag eye in a gas stirred ladle was studied through cold models and industrial trials. In the cold model,water and sodium tungstate solution were employed to simulate liquid steel,and silicon oil was employed to simulate slag. The simulation results revealed that the gas flow rate and bath height had strong effects on the slag eye size. In particular,the thickness of slag layer played a strong role in the slag eye size. In addition,the slag eye could not be formed when the thickness of the top layer was more than 4 cm in water-silicone oil model.Besides,the section area of vessel had a great impact on the slag eye size. Industrial trials results showed a similar trend that the gas flow rate was very significant on the slag eye size. The predictions of the existing models showed larger predictions deviations compared with the experimental data. Moreover,a new model without fitting parameters was developed based on force balance and mathematical derivation,and verified by the experimental data. The new model provides the prediction with small deviations by comparing with the data acquired from cold models and industrial trials.

关键词： Slag eye Cold model Industrial trial Gas blowing Ladle refining

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Water modeling of molten steel flow in a multi-strand tundish with Gas blowing

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 143-148页

作者： Jing Jiang Jing-she Li Hua-jie Wu Shu-feng Yang Tao Li Hai-yan Tang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Engineering Research Institute University of Science and Technology Beijing Beijing 100083 China

Fluid flow characteristics in a four-strand tundish with Gas blowing were studied by water modeling experiments.It is found that Gas blowing can greatly improve the flow characteristics in the tundish with a turbulence inhibitor.It dramatically increases the peak concentration time,and greatly decreases the dead volume,and reduces the minimum residence time.The Gas blowing location,gas flow rate,and porous plug area greatly influence the flow characteristics in the tundish; the Gas blowing location near the baffle,smaller gas flow rate,and smaller porous plug area are better for improving the fluid flow characteristics.Using Gas blowing can reduce the difference of flows at the middle outlets and side outlets for the multi-strand tundish.Bubbles produced by Gas blowing can absorb small inclusions and provide the condition for inclusion collision and aggregation.Therefore,introducing Gas blowing into a tundish and combining the turbulence inhibitor can improve inclusion floating and removal,and the cleanness of molten steel can be advanced.

关键词： continuous casting tundish water modeling Gas blowing porous plug

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