中心分级燃烧室主燃级出口张角对 NOx 排放影响

In order to investigate the effect of main combustion stage outlet angle on NOx emission characteristics,a central staged combustor with four different main combustion stage outlet angles of main combustion stages was used, NOx emission data were obtained through high-temperature and high-pressure emission tests,and the distribution information of components in the combustor were obtained through optical diagnosis,numerical simulation was conducted to further analyze the thermal reflux zone and temperature distribution in the combustor finally. The results showed that the NOx emission decreased with the increase of the outlet angle of main stage. Among the factors affecting NOx emission of the outlet angle of main stage,residence time played the dominant role. The residence time for the outlet angle of main stage on the residence time was affected by changing the axial length and posterior stationary point position of the thermal reflux zone. The outlet angle of main stage was consistent with the swirl angle of the airflow near the outlet.