燃油喷嘴对燃烧性能的控制研究

在WP-7发动机单管燃烧室上采用三种不同形式的燃油喷嘴(离心式、空气雾化式及气旋离心式)进行燃烧试验以研究燃油喷嘴对燃烧性能的控制作用.实验显示了不同形式的喷嘴产生出燃烧性能的差别.通过考察该三种喷嘴对出口温度场燃烧效率、温度不均匀系数、点火、火焰稳定等的控制程度得出:根据需要,可以选择适当的喷嘴来控制性能.特别是本文研究的气旋离心式喷嘴易于控制出口温度场的热点位置,具有离心式和空气雾化式两种喷嘴的优点.

AN INVESTIGATION ON FUEL NOZZLES ON COMBUSTION PERFORMANCE

In this paper, three typies of fuel nozzle differet in atomization principle are separately tested on a jet engine combustion apparatus to examine their performance. These nozzles are characterized by pressure-swirl,airblast and air-assist pressure-swirl. Experiments show that changing in combustor inlet air velocity can slightly improve exit temperature profile, when whichever nozzle is used, pressure-swirl atomizer has the features of good ignition and flame stabilization, but lower combustion efficiency and higher exit extreme temperature.Compared with pressure-swirl atomizer, airblast atomizer is of higher combustion efficiency, better ignition at high air velocity and poorer at low air velocity, and poorly lean fuel-extinction limit; Air-assist pressure-swirl atomizer is of higher combustion effeciency, better ignition and flame stabilization, and with easy to control the position of exit extreme temperature.