平面射流及平面射流火焰中拟序结构的实验研究

Experimental study of coherent structures in planar jets and planar jet flames

在设计和组建了二维平面射流及平面射流燃烧实验系统的基础上 ,对二维平面湍射流流场及平面湍射流燃烧场进行了流场显示实验研究。实验采用烟雾作为示踪粒子 ,由 He- Ne气体激光器产生的激光束经柱面镜后形成片光源实现对流场的照明。实验给出了不同射流伴流速度比下二维平面湍射流的流场显示图像 ,不同的射流发展阶段流场中的大尺度湍流拟序结构的形态及其发展演变情况以及射流燃烧场中湍流拟序结构的形态。实验同时表明 ,在射流燃烧情况下 ,火焰的存在使喷嘴出口处的流动层流化 。

The instantaneous flow images of the large scale coherent structures in turbulent planar jets and turbulent planar jet flames were researched experimentally. A He Ne gas laser was used for the flow visualization with a half cylinder lens used to form a luminous sheet. The flow visualization results of smoke seeded flows show the behavior of the large scale coherent structures in both turbulent planar jets and turbulent planar jet flames. The experimental results also show how laminarization of the flow field occurs under the condition of the jet combustion.