受限射流等温流场数值模拟中三种计算格式的比较  

COMPARISON OF THREE DISCRETE ARITHMETIC SCHEMES FOR SIMULATING THE ISOTHERMAL FLOW OF A CONSTRAINED JET

作　　者：周向阳[1] 徐辉[1] 郑楚光[1] 马毓义 

机构地区：[1]华中理工大学煤燃烧国家重点实验室

出　　处：《工程热物理学报》1995年第4期486-490,共5页Journal of Engineering Thermophysics

摘　　要：对四角切圆燃烧锅炉进行数值模拟时，由于四个角上的射流和计算网格面的夹角接近４５°，往往产生严重的伪扩散问题，极大地影响计算精度。为此，本文设计了一受限射流实验，模拟炉内一角上的时流，拟寻求减小伪扩散的有效方法。针对受限射流，分别采用三种计算格式：混合、ｑｕｉｃｋ和２７点差分格式，编制程序，进行模拟计算，以比较三种格式减小伪扩散的效果。其中“２７点差分格式”是作者所提出的一种较为新颖的计算格式，故对其作了较详细的介绍。最后，将计算结果和实验数据进行了初步比较，结果表明２７点差分格式对减小伪扩散，有着良好的效果。For tangential fired furnace, the false diffusion will occur when the flow is oblique to the grid lines. In order to decrease this false diff usion, this study has compared three schemes: hybrid, quick & 27-point with the aim of identifying which could be regard as the most suitable. Here, '27-point' is a flew discrete arithmetic scheme developed by authors. These schemes are used to simulate a constrained jet and to compare solutions with the datum. Overall the '27-point' scheme emerged as the most satisfactory for simulating constrained jet.

关 键 词：计算格式 数值模拟 受限射流 流场 比较 锅炉 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]