淹没紊动射流三维流场特性的数值模拟

Numerical Simulation for Characteristics of 3-D Flow Field of Submerged Turbulent Jet

采用RNGk-ε紊流模型对有限空间的单孔、双孔紊动射流的流场进行了三维数值模拟研究。研究结果表明:无论入流条件如何变化,经无量纲处理后的轴线流速分布曲线几乎都落在同一条无量纲速度分布曲线上,说明流动存在相似性。双孔射流时,流场存在分区结构,在不同的喷嘴间距下,射流的卷吸程度不同,S/D越大,射流之间的卷吸掺混作用越弱。

The RNG κ-ε model is applied to simulate the 3 - D flow field of single or diploid tubulent jets in confined space. The result shows that no matter how change the condition of inlet flow, the velocity distribution curves under the conduct of no-dimensional axes are almost in the same velocity distribution curve, which presents the flow comparability. It also shows that there is a subarea feature in the flow field of diploid tubulent jets and the extent of entrainment is distinct due to different space between nozzles, and the larger the ratio between S and D, the weaker the entrainment and mixing between jets.