丙酮平面激光诱导荧光技术在喷嘴混合研究中的应用

Application of acetone planar laser-induced fluorescence in research on mixing characteristics of injector

使用丙酮平面激光诱导荧光技术对喷嘴的混合特性进行了研究,分析了示踪粒子及激励波长选择时的注意事项,对丙酮的光物理过程进行了初步研究。对直流离心喷嘴进行了6种速度比的气-气混合实验研究,得到了喷嘴下游区域的浓度分布和混合比分布情况,发现喷嘴存在临界混合速度比vr,cr,vr<vr,cr时混合较差,vr vr,cr时混合较好。

The mixing characteristics of an injector was studied using acetone planar laser induced fluorescence（PLIF） technique. Some technical comments on how to choose the tracer and the excited wavelength were put forward and the photophysical processes of acetone were studied preliminarily. Seven velocity ratios were tested in gas-gas mixing tests in order to get the concentration and mixing ratio distribution of the straight-swirl injector. The research shows that there is a critical velocity ratio vr,cr,if Vr〈 v the mixing is coarse, else the mixing is mood. In addition we found that there are fluctuations of mixing ratio at downstream location.