煤油超雾化粒径二维分布Raman/Mie散射测量研究

Two topics are stiudied in this project. The first is on dropsizing of kerosenen aerosol based on planar Raman and Mie imaging. Then, this method is extended to the in si-tu dropsizing of kerosene atomized flowfield embeded into a superosnic airstream. From this project, we can know the principles and key steps to obtain the dropsizing in a laser sheet from which Raman and Mie scatter. Furthermore, this approach is used to dropsize the atomized flowfield of kerosene fueled scramjet combustor. Such drop size data can be reconstructed to know the related mechanism of this phemnomena. In this project, the imaging of Raman and Mie scattered from kerosene aerosol is newly developed to dropsize SMD in an excited lase sheet. This method can provide more information than the traditional one-point Mie scattering. Also, it is competitive in transient atomized flowfield dropsizing. By extropolation of drop size in drifferetn laser sheet, the three dimensional distribustion of drop size can be easily reconstructed for better physical understanding. In addition, the Raman scattering from C=O bound is strong and can be captured by ICCD camera to avoid the disturbance of utilizing tracer in a supersonic airstream.

主要内容：⑴ 片光Raman/Mie散射光测量雾化场粒径分布的原理性实验研究。⑵煤油超燃冷态雾化场的粒径二维分布在线测量研究。.研究意义：⑴掌握利用Raman/Mie散射光图像测量雾化场SMD粒径定量分布的原理和关键技术。⑵利用该方法，实现煤油超燃冷态雾化场SMD粒径二维分布的在线测量。（3）利用所得数据深入认识和分析煤油超燃冷态雾化的唯象特征和机理.主要创新和特色：⑴探索Raman/Mie散射光结合测量雾化场粒径分布的原理和关键技术。⑵给出片光截面的粒径数据，对不同片光截面的粒径数据进行插值，可重构粒径三维分布。⑶利用煤油C=O基团受激辐射较强Raman散射的特性，解决超燃雾化流场LIF测量中缺乏合适示踪剂的难题。

煤油超声速雾化和粒径测量是研制煤油超燃发动机的关键问题，尽管该问题已得到广泛研究，但相关的精细图像和粒径数据非常有限。发展一种雾化场粒径分布的精细在线测量方法，以便给煤油超燃发动机研制特别是燃烧室设计和评价提供基础性数据，因此深入研究超燃雾化现象和机理性分析具有非常重大的意义。本课题组完成以下三个方面的核心任务：一是利用片激光激发PLIF/Mie散射光图像测量雾化场粒径分布的原理性实验研究，掌握了利用PLIF/Mie散射光图像测量雾化场SMD粒径定量分布的原理和关键技术；二是完成了煤油超燃冷态雾化场的粒径二维分布在线测量研究，实现煤油超燃冷态雾化场SMD粒径二维分布的在线测量；三是利用所得数据和仿真计算进行对比分析，深入认识和分析煤油超燃冷态雾化的唯象特征和机理，判断测量方法的有效性。本课题组通过实验探索和仿真计算相结合的方法深入研究了煤油超燃雾化现象和粒径测量，为超声速煤油发动机的设计和评价以及相关领域提供重要的实验数据和实验测量方法。