An Experimental Study on Ozone Destruction Reaction by Emission from Airplanes in Stratosphere

本文对喷气式飞机排气对平流层臭氧层的影响进行了实验研究。平流层条件是使用一个大的真空室模拟的，其中环境压力保持在2.67千帕，并指向紫外线源。这个环境压力几乎等于海拔25公里处的压力。使用低压汞灯作为紫外线源。本论文进行了两类实验：一类是研究飞机喷入的NOx在大气中完全扩散时，臭氧和NOx的光化学反应行为;抽真空后，向真空室内注入一定量的NO和NO2，并用空气和N2稀释。然后发射紫外线，用LIF法测量NO和NO2的浓度。利用平流层中的特性进行了计算，以与实验结果进行比较。结果表明，大气中NO、NO_2、O_3等化学反应的变化趋势是： ...更多信息 二是对飞机喷管出口附近喷流中的臭氧与NOx的反应进行了计算。从喷嘴喷射被氮气稀释的NO气体作为模拟臭氧层中的废气。采用激光诱导荧光（LIF）方法测量了射流中NO和NO2的浓度，并根据激光诱导荧光图像计算了NO与臭氧的反应量。由于臭氧吸收了226.1nm附近的激光来模拟NO分子和NO-LIF信号，因此NO-LIF的反应速率远大于实际的反应速率。用NO-LIF法测定NO与臭氧的反应量是不合适的。然而，在这种情况下，由于其强度很强，因此将流动可视化是有用的。由NO_2-LIF计算得到的反应量与简化计算的结果相比是有效的。NO_2-LIF方法可用于定量测定臭氧层中NO与臭氧的反应速率。少

An experimental study on the effect of jet exhaust gas on the stratospheric ozone layer was conducted. The stratospheric condition was simulated using a large vacuum chamber, where the ambient pressure was sustained at 2.67 kPa and an ultraviolet ray source was directed. This ambient pressure is almost equal to that at the altitude 25km. A low-pressure mercury lamp was used as a source of ultraviolet rays. Two types of experiments were conducted.One is for the behavior of ozone and NOx with photochemical reactions when the NOx injected from airplanes is fully diffused in the ambience. After evacuating the chamber, a certain amount of NO and NO2 was injected into the chamber and was diluted by Air and N2. Then ultraviolet rays started emitting and the concentration of NO and NO2 were measured by LIF method. Calculations using properties in the stratosphere were conducted to compare with experimental results. As a result, the tendencies of reactions including NO, NO2, ozone in the strato … More sphere are explored and the chemical reaction model in this calculation is verified.The other is for the reaction between ozone and NOx in the jet plume near the exit of the nozzle of airplanes. NO gas, which was diluted by nitrogen, was injected from a nozzle as an exhaust gas in the simulated ozone layer. NO and NO2 concentration in the jet stream were measured by LIF methods, and the reaction amounts between NO and ozone were derived from LIF images. The reaction rate derived NO-LIF was much bigger than the actual one, because ozone absorbed laser beam near 226.1 nm to simulate NO molecular and NO-LIF signal. It was not proper to use NO-LIF method to determine the reaction amount between NO and ozone. However, it was useful to visualize the flow in this condition because of its strong intensity. The reaction amount derived from NO2-LIF was valid compared with a result of simplified calculations. The NO2-LIF method can be available for the measurement of reaction rate quantitatively between NO and ozone in the ozone layer. Less