受限同轴射流的混合特性及数学模型

Mathematical Models and Experiment on Gas Mixing of Confined Coaxial Jets

对气相受限同轴射流的混合特性进行了实验研究,在等温状态下,测量了平均速度和湍流强度分布。在非等温状态下,测量了平均温度分布,在实验基础上,提出了受限同轴射流气相混合的数学模型,并讨论了上述实验结果及数学模型在煤粉燃烧室设计中的应用。研究表明,在较低的中心射流速度下,同轴射流的混合较快。

The gas mixing characteristics of a confined coaxial jets system was investigated experimentally. Mean velocity/temperature and turbulent intensity were measured with hot-wire. A mathematical model was proposed for gas mixing in confined coaxial jets based on the experimental results. Discussions were made of the experimental results and mathematical model for their applications in combustor design. The measurements show that at a lower central velocity, the two jets mix more rapidly.