差示扫描量热仪炉膛温度场仿真研究

Boiler structure design of differential scanning calorimeter and the simulation of its temperature distribution

差示扫描量热仪(Differential Scanning Calorimeter,DSC)作为研究物质成分及物化性质与热流、能量关系的分析仪器,其炉膛在设计时要求具有良好的均温性从而保证热流、能量的精确检测。为了提高炉膛均温性,研究样品支撑架上样品与参比端的间距对炉膛均温性的影响。通过ANSYS软件建立DSC炉膛数学模型,计算和比较不同间距模型不同稳态温度时炉膛温度场分布,得到在内径为28mm的DSC炉膛下样品与参比端的最优间距为12.5 mm,并进行实验验证了利用该法仿真得到的温度分布规律。通过仿真分析对优化炉膛设计有一定的指导意义。

As an analytical instruments which study the relationship of heat flux, energy and the physical and chemical properties of substance,temperature uniformity of the differential scanning calorimeter furnace must be considered when the furnace is designed to guarantee theaccuracy of heat flux detection. In order to improve the temperature uniformity of the furnace, research on the influence of the distancebetween the sample and reference on furnace temperature uniformity. Firstly, creating the furnace models of different distances between sampleand reference, then calculating and comparing the furnace temperature distribution at different temperatures in a certain rate of air flow inANSYS, the simulation results show that the optimal distance between the sample and the reference side is 12.5 mm with an inner furnacediameter of 28 mm. which is validated by temperature uniformity experiment. According to this simulation research and analysis, it will havecertain directive significance to optimize furnace design.