室内空间重气泄漏扩散过程的影响因素

以CO2为对象,对室内空间重气扩散过程进行实验研究,考察泄漏源强度、泄漏源高度和开窗对室内CO2扩散过程的影响。结果表明:CO2在室内空间泄漏扩散后有明显的沉降和分层现象。CO2浓度和浓度上升速率随着高度的增加而减小。随着泄漏源强度的增加,近地面处CO2浓度和浓度上升速率均增加,远离地面处CO2浓度值略有上升。随着泄漏源高度的增加,近地面处CO2浓度和浓度上升速率均减小,远离地面处CO2浓度增加。当泄漏源高度较高时,虽然近地面处的CO2浓度相对有所减小,但整个空间都会有较高CO2的气体分布,危险性更大。室外静风条件下,在高位开窗时,空间内CO2浓度没有明显的降低;但在低位开窗时,近地面处CO2浓度明显降低,但远离地面处,CO2浓度降低幅度较小。

Influence factors of dense gas leakage and dispersion indoor

The experiments about continuous leakage and dispersion of indoor carbon dioxide(CO2) were investigated.The influences of source strength,source height,and windows on dispersion process of CO2 indoor were analyzed.Results showed that CO2 was settled and a layer was formed obviously after leakage.The concentration and the rate of concentration rise of CO2 all decreased with the increment of height.As the increasing of gas leakage source strength,the concentration and the rate of CO2 concentration rising enhanced sharply at positions near the ground and increased a little at positions far from the ground,but as the rising of gas leakage source height,the concentration and the rate of concentration rising decreased near the ground,while the concentration increased far from the ground.The concentration near the ground decreased a little when the leakage source was higher,but the whole space would be filled with CO2 with higher concentration,thus it was a more dangerous situation.The concentration of indoor CO2 was not obviously decreased with higher windows and static outdoor wind,but when the height of windows was low,the concentration of CO2 decreased obviously near the ground and a little far from the ground.