混合层流场中涡结构对流速度的特性

发布时间：2018-09-06 15:23

【摘要】：基于大涡模拟和光线追踪方法,对光线穿越流场后的光程分布与混合层流场中涡结构之间的关系进行了分析,提出了一种基于涡核位置提取的涡结构瞬时对流速度定量计算方法,并使用直接几何测量数据进行了验证.通过对不同尺寸的涡结构、涡-涡配对及融合过程中的涡结构和强压缩性流场中涡结构瞬时对流速度的定量数值计算,揭示了混合层流场中涡结构对流速度的特性:对单个涡结构而言,其瞬时对流速度具有脉动特性,且脉动幅度随涡结构尺寸和流场压缩性而变化;在涡-涡配对及融合过程中,涡对中各个涡结构的瞬时对流速度都表现出类似正弦波动的特点.针对混合层流场中涡结构对流速度的特性,给出了其背后的物理原因.
[Abstract]:Based on the large eddy simulation and ray tracing method, the relationship between the optical path distribution of light passing through the flow field and the vortex structure in the mixed laminar flow field is analyzed. A quantitative calculation method of instantaneous convection velocity of vortex structure based on location extraction of vortex core is proposed and verified by direct geometric measurement data. The instantaneous convection velocities of vortex-vortex structures in different sizes, vortex-vortex pairing and fusion processes, and vortex-structure transient convection velocities in strongly compressible flow fields are calculated quantitatively. The characteristics of convection velocity of vortex structure in mixed laminar flow field are revealed: for a single vortex structure, the instantaneous convection velocity has pulsation characteristics, and the amplitude of fluctuation varies with the size of the vortex structure and the compressibility of the flow field, and in the process of vortex-vortex pairing and fusion, The instantaneous convection velocity of each vortex structure in vortex-pair is similar to that of sine wave. The physical reasons behind the convection velocity of vortex structure in mixed laminar flow field are given.
【作者单位】：上海交通大学航空航天学院;中国航天科工集团第二研究院;
【基金】：国家安全重大基础研究计划(批准号:613276) 国家自然科学基金重点项目(批准号:91330203)资助的课题~~
【分类号】：O35

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