The Simulation Analysis Of Factors Influencing Temperature Distribute Unbegain If Ormity On The Radiant Tube Wall

During the heat treatment of metal materials, in order to obtain good surface quality and reduce the oxidation burning loss, direct heating by flame isn’t applicable.So many indirect heating devices are invented, Gas Radiant Tube is one of this type of indirect heating devices. When Gas Radiant Tube is working,some disadvtangges are found,such as uneven surface temperature of tube uneven, Local high temperature and lower thermal efficiency thermal stress,short use time and pollution,but these bad condition can improve by research.First, paper states the working principle of Gas Radiant Tube,explains the composition of Gas Radiant Tube,types of Gas Radiant Tube and some indicators for measuring f Gas Radiant Tube’s performance.Paper also Expounds the research status of Surface temperature unbegain if ormity at home and abroad, and makes a summary of these research,then,paper puts forward research content of the subject.Second，solid model is built and meshed by workbench， converting solid model to the model applied to FLUENT. Paper tells the assumptions necessary in simulation and the control equation, mainly introduced all kinds of combustion model and radiation model in FLUENT, Chooses the suitable gas radiant tube simulation model and cacaulates required boundary conditions。Furthermore,paper analysis the factors that affect tube wall temperature unbegain if ormity. By using the transient solver and UDF in FLUENT, Studies the effects of continuous variation of air velocity on tube wall temperature unbegain if ormity,Statistics and analysis tube wall temperature data and heat of the dbegain if ferent time, providing reference for later research.After, the effects of air injection Angle on tube wall temperature unbegain if ormity was and thermal efficiency are studied by using UDF, Also studied the effect of air preheat temperature on the temperature unbegain if ormity, and analysis the data.Finally,paper simulaties and analysis the method for improving the thermal efficiency of gas radiation tube. Disturbing pieces is a kind of commonly used device to improve the thermal efficiency of the radiation tube. By simulating the model with cross-shaped disturbing piece and And compareing with the model without disturbing piece, analysis the effect of cross-shaped disturbing piece on thermal efficiency and temperature unbegain if ormity. Then paper simulaties the model with screwy disturbing piece and compare with the model with cross-shaped disturbing piece. Radiant tube material also influence thermal efficiency. Radiant tube manufactured bySilicon carbide has very high thermal efficiency. In addition, the thesis summarizes thess research’s iinsufficient, and provide a reference direction for the later research.