雾化激波管研制和煤油点火延时测量

为测量雾化煤油点火延时和得到火焰自发辐射光强分布，研制了雾化激波管和燃料雾化、进气系统。采用“管外预混”思想形成煤油气溶胶，通过连续进气和抽吸方法使气溶胶均匀分布，未出现明显的液滴沉降和壁面吸附。当点火温度为1000K，缝合接触面运行的实验时间大于10ms。由压电传感器PCB和光电倍增管PMT测量指定点压力、OH基光强时间曲线。利用Mie散射测量煤油气溶胶散射光分布，采用ICCD拍摄自点火发射光强。结果表明：该雾化系统可形成粒径为2～5μm煤油气溶胶。当压力为0．1MPa、温度为1300K～1700K，测得化学计量比≠=1．0煤油气溶胶点火延时τig为0．07—6ms，In（τig）和10000／τig近似呈线性关系。与气态煤油相比，该文高温点火延时和已有文献数据接近，但低温点火延时偏大，表明了低温下煤油点火的两相效应。

The ignition delay measurement of atomized kerosene air mixture in an aerosol shock tube

A new aerosol shock tube was developed for measuring ignition delay time τig of kerosene air mixture and imaging of flame. Aerosol was formed in a tank by an atomizer. Neither condensation, nor adsorption of droplet was found obviously in the test section. The condition of tailored contact surface was run to provide test time more than 10ms and it is enough for τig measurement at low temperature of 1000K. PCB gauges were used to detect pressure and photomultiplier PMT to record OH emission. ICCD was used to record Mie scattering of droplets and flame emission. The results indicated that a rather homogeneous aerosol can be obtained by this new shock tube, atomizer and filling system. The averaged SDM is ranged from 2 to 5μm. In the case of stochiometric mixture, τig is ranged from 70μs to 6ms at pressure 0.1MPa and temperature from 1300K to 1700K. The in（τig） almost depends on 10000/Tig linearly. In contrast to gasified kerosene, τig is approximately the same at high temperature but large at low temperature. This does mean aerosol is actually in two-phase at low temperature.