四喷管射流流场的数值模拟及分析

CALCULATION OF JETS FLOWFIELD WITH HIGH RESOLUTION ENO

本文分析了 ENO格式的特点 ,并应用于全 NS方程的迁移项和压力项 ,模拟了三维射流。首先计算了四喷管射流干扰流场 ,给出了相应的计算结果 ,指出了其四股射流外部有形成类似一股射流波系的趋势 ,而内部四股射流始终存在并相互作用 ,且伴随流对内部干扰流场有重要影响 ;然后计算了四股射流流入圆管内的流场 ,给出了壁面和截面物理量的分布 ,分析了其拓扑结构。

The third order ENO scheme has been used to discrete convective terms and pressure terms in the Navier Stokes equations.At first,the interacting flow fields of four jets are calculated.Its results indicate that there gradually forms one wave system like a jet in the outer part of the jets,where there are still four jets in the inner part.The structure of the wave system in the inner part is very complicated depending on the external flow.The flow field in a tube where the four jets flow in is also calculated,and the distributions of the variables in a few sections and on the wall and the topographic structure are given.