汉阳陵遗址文物保存风幕隔离及富氮低氧环境数值模拟研究

Digital simulation of air curtain isolation and a high nitrogen-low oxygen environment for conservation of relics unearthed at the Han Yang Ling Mausoleum

汉阳陵帝陵从葬坑遗址保护展示厅常年的高湿度环境(空气相对湿度为95%±5%)容易使遗址文物发生霉变等病害。为此本研究以从葬坑遗址保护展示厅15号坑为研究对象,根据基本假设,建立了从葬坑文物保存区域空气流动的二维数学模型,并采用标准k-ε两方程湍流模型和SIMPLE算法进行了数值计算。研究了风幕送风速度和送风仰角对风幕隔离性能的影响,并确定了15号坑适宜的送风速度为1.5m/s、送风仰角为10°。研究结果对高湿环境下如何营造风幕隔离及富氮低氧环境提供了依据,对坑式遗址文物保护具有重要意义。

Unearthed relics easily grow mildew at exhibition sites due to extremely high relative humidity. At the Han Yang Ling Mausoleum, located at Xi＇ an, China, the relative humidity is around 95 % ± 5 % perpetually. The environmental conditions of the 15th burial pit at the Han Yang Ling Mausoleum were investigated digitally and a two - dimensional mathematical model of the conservation area of the burial pits relics was established according to certain hypotheses. Air curtain technology was used to isolate the relics from the viewing area. Based on this model, a digital computation was carried out using a standard k -e turbulence model and the SIMPLE algorithm. In this investigation, the influence of the inlet velocity and elevation angle to the air curtain isolation performance was studied. This study shows that the appropriate inlet velocity of the air curtain for the 15th pit is 1.5 m/s with an elevation angle of 10 degrees. This study provides basic guidance for creating air curtain isolation and high nitrogen - low oxygen condition in high relative humidity environments. The method is instructive and meaningful for the protection of pit relics.