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机构地区:[1]清华大学清洁煤燃烧国家重点实验室,北京100084
出 处:《中国电机工程学报》2002年第7期29-34,共6页Proceedings of the CSEE
摘 要:采用非交错网格体系,在任意曲线坐标系下,数值模化带有屏式过热器的四角切圆燃烧煤粉锅炉。有限差分方法离散强守恒型式通用雷诺时均N-S方程组,类指数差分格式模拟胞元界面流率,类SIMPLE方法满足不可压缩条件,k-epsilon方程模拟湍流粘性。求解椭圆偏微分方程的数值方法生成网格。通过逐层给定网格边界点,调整控制方程系数,将计算域内网格依次转换至圆形周界的过渡域和物理域中。在燃烧器区域的网格线接近炉膛水平截面对角线方向,而在炉膛上部则平行于边界。模拟计算结果比较接近3D-PDA(三维相激光多普勒测速法)测定的实验值,说明本文网格布置有利减小伪扩散和方便模拟炉膛内的过热器。The tangentially-fired pulverized coal boiler with platen heaters is modeled on general curvilinear coordinate with collocated grid system. Strong conservation form Reynolds-average Navier-Stokes equations is adopted and discretized with exponential-based scheme to simulate convection across cell surfaces. Uncompressible condition is satisfied by SIMPLE-based method. Turbulent viscosity is modeled by K-epsilon method. The meshes are generated by the solution of elliptic partial differential equations. With carefully specified boundary points in each grid layer and the coefficients in control equations, the mesh in computational domain is succex transformed into the circle-periphery transitional domain and the physical domain. The resulting gridlines in burner region are nearly parallel to the diagonals of the horizontal cross-section of the furnace, while the ones on upper furnace are parallel to the boundary. The numerical model is validated by the experimental measurement using 3-dimensional phase Doppler anemometry, and good comparison demonstrates its ability to reduce numerical diffusion and to simulate heaters/reheaters on upper furnace conveniently.
关 键 词:贴体网络 四角切圆锅炉 模拟 三维等温流场 过热器
分 类 号:TK223.32[动力工程及工程热物理—动力机械及工程]
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