非对称突扩通道流动特性的数值模拟

Numerical simulation of flow characteristics in unsymmetrical sudden expansions channel

针对非对称突扩通道的流动,建立了平面二维不可压稳态层流数学模型,采用守恒性能高的有限体积法对控制方程进行离散,并选用绝对稳定的混合格式,利用交错网格下的SIMPLE算法进行流场数值计算,得到了回流区形态的变化规律.研究表明,非对称突扩通道流动受雷诺数和几何形状的影响.

Two-dimensional steady laminar flow model is setup to simulate the flow in an unsymmetrical sudden expansion channel.The finite volume method,which is a high performance conservation method,is used to complete discretion of the control equations,and absolute stability of mixed format is selected.The SIMPLE algorithm based on staggered grid is used for flow field numerical computation,and formation variation law of back-flow area is found.Research shows that the flow in an unsymmetrical sudden expansion channel is influenced by Reynolds number and geometrical shape.