摘要
In this paper, cold simulation experiments and numerical calculations are conducted to predict 3 D flow field aerodynamics for an oil furnace after being retrofitted due to its fuel variation. K ε model and SIMPLE program under body fit coordination (BFC) system, in which TTM non orthogonal method is used to control the irregular geometric boundary, are adopted to solve the control equations. Model tests are conducted to check the calculation results, showing that they are in agreement with each other. Three different alternatives with different side window locations are also calculated to optimize the designs. The field retrofitting results show that the combination of cold tests with numerical calculations has prosperous application in retrofitting or renewing medium and small boilers.
对一台 2 2 0t/h燃油锅炉掺烧油焦后的炉膛内三维流场进行了冷模实验和数值模拟 ,以预测由于掺烧而对锅炉进行改造后的炉膛内流场的空气动力特性 .采用K ε模型 ,运用TTM的非正交贴体网格来处理炉膛的不规则边界 ,在贴体坐标系下用SIMPLE算法对控制方程进行求解 .为了验证解的正确性 ,将原型锅炉制成模型 ,在额定工况下进行实验 ,实验结果与计算结果相吻合 .在此基础上 ,结合该锅炉三种改造方案计算出较佳结构尺寸 .现场改造结果显示 ,运用数值计算和模化实验相结合的方法对锅炉进行改造 ,具有广阔的应用前景 .
