Prediction of Ozone Depletion in Upper Atmosphere by Nitric-Oxides in Supersonic Aircraft Engine Exhaust

超声速飞机发动机排出的臭氧（O_3）和氮氧化物（Nox）发生化学反应导致的臭氧消耗是超声速飞机发动机完成超声速飞行的关键环境问题之一。本研究旨在预测臭氧耗损量，并从上层大气臭氧保存的角度协助社会评估。本研究的主要发现如下：1。臭氧（O_3）和氮氧化物（Nox）化学反应的地面实验(a)在东京大学航空航天系的空间室内，利用傅里叶变换红外光谱法建立了臭氧浓度的测量程序。(b)臭氧和一氧化氮的化学反应可以在空间室内模拟。(c)从化学反应的数值常数可以证实。臭氧（O_3）与氮氧化物（Nox）化学反应的数值模拟(a)建立了二维大气模型，预测了飞机排放的氮氧化物对臭氧浓度的影响。(b)在20公里高度上消耗的氮氧化物对臭氧浓度的影响很小，但在30公里以上的高度上的影响不容忽视，这表明臭氧可能耗竭。

Ozone depletion due to chemical reaction with ozone (O_3) and nitric-oxides (Nox) exhausted from an engine of supersonic aircraft is one of critical environmental issues for its accomplishment. This research is to predict the amount of ozone depletion and to assist for social assessment on the standpoint of ozone preservation in the upper atmosphere.The major findings by this research are as follows :1. Ground Experiment for Chemical Reaction of ozone (O_3) and nitric-oxides (Nox)(a) The measurement procedure for ozone concentration has been established with use of FT-IR method in the space chamber of Department of Aeronautics and Astronautics, The University of Tokyo.(b) Chemical reaction of ozone and nitric-oxides could be simulated in the space chamber.c It was verified that, from the numerical constants for chemical reactions.2. Numerical Simulation for Chemical Reaction of ozone (O_3) and nitric-oxides (Nox)(a) Two-dimensional atmospheric model has been established and the effect of nitric-oxides exhausted from aircraft on ozone concentration has been predicted.(b) The effect of nitric-oxides exhausted at the altitude of 20km on ozone concentration is small, but that at over 30km is not neglected which suggests the possibility of ozone depletion.