非等温液-液对置撞击面温度分布均匀性

对不同条件下非等温过程液-液对置撞击后形成的气液混合撞击面的温度分布均匀性进行了研究。以温度不均匀系数和撞击面温度分布作为评价标准，利用Mixture模型数值模拟撞击过程，并基于平面激光诱导荧光（PLIF）技术进行可视化测量实验验证计算模型。通过对不同的喷嘴出口速度（v）、喷嘴对置间距（L）以及湍动能等条件下撞击面温度分布进行研究。结果表明，喷嘴直径和喷嘴对置间距一定时，增加喷嘴的出口流速，则温度不均匀系数整体呈下降趋势；喷嘴直径和喷嘴出口流速一定时，非等温液-液对置撞击后形成区域温度场分布随喷嘴间距的增加，其温度分布区间呈减小趋势。L=3D时，温度的分布区间最小，温度场分布最均匀。湍动能的分布曲线越平稳，液-液对置撞击后形成的气液混合撞击面的温度分布越均匀。

Impact surface temperature distribution uniformity of non-isothermal liquid-liquid opposite impinging process

The temperature distribution uniformity of impact surface formed by non-isothermal liquid-liquid impinging process was studied in this paper. Taking temperature unevenness coefficient and temperature distribution as the evaluation criterion, the impinging process was numerically simulated by using the mixture model. The numerical results were verified by the visualization experiments based on the technology of PLIF(planar laser induced fluorescence). Temperature distribution of the impact surface was studied by different velocities(v), nozzles distance(L) and turbulent kinetic energy. The results showed that temperature unevenness coefficient will decrease with the increase of velocity when the diameter and nozzels distance were fixed. Temperature distribution of impact surface decreases with the increase of nozzles distance when the nozzle diameter and velocity are constant. Temperature distribution interval is the smallest when L=3D, and the uniformity is the best. The more stable the distribution curve of turbulent kinetic energy is, the more uniformity temperature distribution of the impact surface is.