| Heat treatment is final as well as one of the most important procedures in accessory and mould produce. Push-type furnace is widely used as a kind of continuous heat treatment furnace. Previous research indicated that carburizing ununiformity is mostly likely caused by the ununiformity of temperature distribution and immoderate gas flow, what's more, temperature ununiformity relates on gas flow distribution. Therefore, it's necessary to understand the gas flow characteristic in furnace, so that the temperature and flow field are improved which lead to improvement of carburizing product. It's also useful in developing new furnace and optimizing the run of existing furnace.The structure and characteristic of push-type furnace is introduced, the flow manner and speciality in furnace is analyzed. A 3-D cold-state steady numerical simulation model for the turbulence flow in furnace is established. The simulation is base onκ-εturbulence model, control volume method is chosed for equation dispersation, SIMPLE arithmetic is used for the coupling of pressure and speed. The pressure and flow distribution in furnace is gained.Cases under different fan speed and the disposal of erect baffle were computed. The flow field distribution,gas speed,flow uniformity effected by the two factors were analysed. The effect of mass outflow proratation between ahead and end venthole to gas exchange between carburizing and diffusion region was researched.The innovation of the paper is that, CFD was employed for the research of the flow field in continuous heat treatment furnace. It's meaningful in directing design new type furnace and help to improve the the run of existing furnace.What's more, the paper research expand the research of heat treatment. |
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