In the unstable flow the radial distribution of tracergas concentration is asymmetry.
在不稳定的流动状态下，气体的径向浓度分布曲线两边出现不对称。
2
Experiments on the air infiltration by tracergas method and obtains the range of air infiltration rate per unit length of the crack.
采用示踪气体法对塑钢窗冷风渗透量进行了实验，得出了塑钢窗单位长度渗风量的范围。
3
For improving the air quality, the concepts of age of air are introduced and the solutions of age of air and ventilation efficiency are obtained by using tracergas concentration of…