不同构型波瓣混合器的射流掺混机制

前人对波瓣混合器射流掺混的研究，每个研究其样本较少，不具有系统性，且聚焦于流体动力学结构的演变，而忽视了热质对流的演变。本项目采用数值模拟方法，研究三个波瓣高宽比的直线排列波瓣混合器，三种混合器构型的圆形排列波瓣混合器，以及三种混合器构型的矩形排列波瓣混合器，在多个速度比状态下的射流掺混场中，流向涡的演变机制、大尺度热质对流的演变机制以及正交涡带的演变机制。通过开展本项目的研究，预期能够弄清楚不同波瓣混合器在不同速度比状态下的射流掺混中，横向流动相互卷绕的机制，流向涡涡核的形成机制，流向涡形态发展的机制，流向涡的破裂机制，大尺度热质对流的演变及其与流向涡的演变之间的联系，以及流向涡和热质对流在正交涡带演变中的作用。

The previous researches on jet mixing of lobed mixer have no systematicness as the number of samples for each study is small. Also, these researches only focus on the evolution of fluid dynamics, but basically neglect the evolution of heat and mass convection. In this project, numerical simulation method is adopted to study the evolution mechanisms of the streamwise vortices, the large scale heat and mass convection, and the normal vortex strip in the jet mixing fields of different configuration lobed mixers with multiple velocity ratios. These lobed mixers comprise three linear arrangement lobed mixers with different height to width ratios of lobe, and three circular arrangement and three rectangular arrangement lobed mixers with different configurations. In the jet mixing fields of different configuration lobed mixers with different velocity ratios, it is expected to be able to figure out the convolute mechanism of the lateral flow, the formation mechanism of streamwise vortex core, the development mechanism of streamwise vortices, the broken mechanism of streamwise vortices, the evolution of large scale heat and mass convection and its relation to the evolution of streamwise vortices, and the role of streamwise vortices and heat and mass convection in the evolution of the normal vortex strip.