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选择敦煌莫高窟10个典型洞窟用六氟化硫(SF6)气体进行洞窟内外空气交换速率的实验测定,结果表明:洞窟内外空气交换速率除受洞窟内外温度差、窟外风场(风向,风速)的影响外,还与洞窟所在层位、洞窟形制、主室大小、有无甬道及大小、有无游客参观密不可分。在有游客参观时,洞窟主室大小、甬道大小与交换速率具有指数相关性。在没有游客参观时,第一层(底层)、第二层洞窟主室体积、甬道体积与交换速率之间存在指数关系,而第三层洞窟体积和甬道体积与空气交换率呈正比例关系。游客参观对洞窟空气交换速率和洞窟空气质量影响较大,不同层位的洞窟影响并不一致。
The results show that the air exchange rate inside and outside the cave is affected by the temperature difference between inside and outside the cave, the wind field outside the cave (wind direction, Wind speed), but also with the caves where the cave shape, the size of the main room, with or without the corridor and size, with or without visits to tourists are inseparable. In the presence of tourists, the main cave cave size, corridor size and the exchange rate has an exponential correlation. In the absence of tourists, there is an exponential relationship between the main chamber volume, the corridor volume and exchange rate in the first (bottom) and second cave caves, and the third cave volume and corridor volume are directly proportional to the air exchange rate. Visitors to visit the cave air exchange rate and cave air quality greater impact of different layers of cave impact is not the same.