高温气流平面射流扩散过程分析

在工业生产中经常会出现高温烟尘气的排放与扩散现象，研究高温烟尘气的射流扩散过程对于烟尘治理和集尘通风系统设计有重要意义。通过数值模型分析与试验分析结合的方法，对高温气流扩散过程进行分析与研究。结果表明：在高温气流水平浮力射流扩散过程中，射流温度显著改变了射流扩散轨迹和速度分布，随着气流温度的升高，气流密度降低，使射流在水平方向速度衰减加速，而低密度气流的热浮力效应增强，在垂直方向速度值增加加剧，形成了更靠近射流壁面的上浮扩散轨迹；在高温气流射流扩散分析中，在理想气体的浮力模型中添加了密度随温度的变化，因此它比布辛涅斯克近似的浮力模型获得的射流轴线速度与射流扩散轨迹结果更准确，可知改模型适合分析高温气体的浮力扩散特征；两种模型获得的射流速度分布的结果误差相反，使两种模型能够适用于不同类型的工程需求

Research and Analysis on the diffusion process of high temperature air plane jet

In industrial production, the buoyancy jet diffusion phenomenon of high temperature smoke gas often appears. It was important to study the buoyancy jet diffusion process of high temperature smoke gas for smoke control and dust collection ventilation system design. In this paper, by the numerical analysis and experiment, the diffusion process of high temperature air plane jet was analyzed. The results show that the air temperature significantly changed the jet track and velocity distribution in the high-temperature air horizontal plane jet. With the increase of the air temperature, the air density decreases, which accelerates the velocity decay in the horizontal direction, while the thermal buoyancy effect of the low-density air flow increases, and the velocity value increases in the vertical direction, forming the diffusion path closer to the jet wall. In the analysis of high temperature air jet diffusion ,the change of density with temperature was added to the calculation of buoyancy of ideal gas model, so it is more accurate than the jet axis velocity and jet diffusion track obtained by the buoyancy model of Boussinesq approximation model, and it is more suitable to analyze the buoyancy diffusion characteristics of high temperature air. The error values of jet velocity distributions obtained by the two models were opposite, so that the two models could be applied to different types of engineering requirements.