基于数值模拟的实验室氮氧化物生成装置设计

Design of a NO_x Generator Used in X Laboratory Based on Numerical Simulation

基于数值模拟，设计了一种实验室用氮氧化物生成装置。该装置利用乙炔和氧气发生燃烧反应所产生的高温温度场，使随同空气一起进入燃烧室的氮气与氧气发生反应生成NOx。数值模拟表明：设计方案是可行的。调控乙炔喷口气流速度是调节燃烧室出口NOx浓度的主要手段，在乙炔喷口气流速度为3～5m／s时，燃烧室出口的NOx平均浓度变化范围为2064～4297cm^3·m^-3；在一定的乙炔喷口气流速度下，调节空气入口速度也可在小范围内调节燃烧室出口NOx浓度。从而可以满足实验过程中对NOx浓度的不同要求。

Based on numerical simulation, a NOx generator is designed. In the generator, acetylene reacts to oxygen getting in together with air to release a great deal of heat and to induce high temperature field in the combustion chamber, and then the nitrogen in the air reacts to oxygen to produce NOx. Numerical simulation shows that the scheme is feasible. The NOx density of the outlet of the chamber can be adjusted by changing the velocity of the acetylene jet,i, e. , when the latter changes from 3-5m/s,the former changes from 2064-4297ppm. To maintain the velocity of the acetylene jet but to change the velocity of the air jet can also adjust the NOx density in smaller scale. Thus ,the generator can meet different requirements in various situations.