横流均匀环境中三维线源型正负浮力射流特性研究

Study on 3-D line-source positive and negative buoyant jets in uniform cross flows

本文利用混合有限分析法及交错网格。对横流均匀环境中三维线源型正负浮力射流及负浮力射流的特性进行研究 ,分析了不同工况下流速、温度和湍动能在断面上的分布及影响射流轨迹线的因素 ,讨论了轨迹线上温度的变化及浮力射流的贴壁现象。对三维长线源型负浮力射流 ,分析了流速比。

Hybrid finite analytic method (HFAM) and staggered grid were applied to study the 3 D line source positive and negative buoyant jets in uniform cross flows. The distribution of velocity, temperature and turbulent kinetic energy at cross sections were analyzed. The influence factor of the temperature changes on trajectories, and the phenomenon of keeping close to bottom were discussed. The influence of the velocity ratio and the densimetric Froude number on negative buoyant jet were also analyzed.