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首页> 外文期刊>International Journal of Heat and Mass Transfer >New application method of the zonal model for simulations of pulverized coal-fired furnaces based on correction of total exchange areas
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New application method of the zonal model for simulations of pulverized coal-fired furnaces based on correction of total exchange areas

机译：基于总交换面积修正的区域模型在煤粉炉模拟中的新应用方法

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摘要

New application method of the zonal model in numerical simulations of pulverized coal-fired furnaces, continual corrections of the total exchange areas (CCTEA), is presented. The method is based on the corrections of the surface-surface, surface-volume, and volume-volume total exchange areas according to the changes of the surface zone emissivities during the iterative calculation of the numerical simulation and summation rules of the total exchange areas, so that it provides zero radiative exchange in an isothermal system. The method was developed for the homogeneous and uniform flame radiative properties. The results obtained by the CCTEA method were compared with the results obtained by the previously developed repeated run of numerical simulation (RRNS) method, based on multiple succesive run of the numerical simulation. The differences of the result obtained by the methods were found for various conditions of numerical investigations: initial wall emissivity, total extinction coefficient, and thickness of the ash deposit layer. The gas-phase phase radiative properties were determined by the simple gray gas model and weighted sum of gray gases model. Investigation showed small differences of the results obtained by the methods and their sensitivity to conditions of numerical investigation. The CCTEA method is an improvement of the RRNS method as it provides almost the same results after the single run of the numerical simulation and reduces the computation time.
机译：提出了区域模型在煤粉炉数值模拟中的新应用方法，对总交换面积（CCTEA）进行连续校正。该方法基于迭代计算数值模拟和总交换面积求和规则时根据表面区域发射率的变化对表面，表面体积和体积总交换面积进行校正，从而在等温系统中提供零辐射交换。该方法是为均匀和均匀的火焰辐射特性而开发的。基于多次成功的数值模拟，将CCTEA方法获得的结果与先前开发的数值模拟重复运行（RRNS）方法获得的结果进行比较。对于数值研究的各种条件，发现了通过该方法获得的结果的差异：初始壁发射率，总消光系数和灰烬沉积层的厚度。通过简单的灰色气体模型和灰色气体模型的加权和来确定气相的辐射特性。研究表明，通过该方法获得的结果及其对数值研究条件的敏感性差异很小。 CCTEA方法是RRNS方法的改进，因为它在进行一次数值模拟后即可提供几乎相同的结果，并减少了计算时间。

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