文章基本信息

标题：Large-Eddy Simulation of Swirling Flows in a Pulverized Coal Combustion Furnace with a Complex Burner
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作者：Hiroaki WATANABE ; Ryoichi KUROSE ; Satoru KOMORI 等
期刊名称：Journal of Environment and Engineering
电子版ISSN：1880-988X
出版年度：2009
卷号：4
期号：1
页码：1-11
DOI：10.1299/jee.4.1
出版社：The Japan Society of Mechanical Engineers
摘要：LES (Large-eddy simulation) of swirling cold-flows in a pulverized coal combustion furnace is performed and validated by comparing with experiment and RANS (Reynolds-Averaged Navier-Stokes) simulation with the standard k - ε model. Unstructured grids and energy-conserving scheme are employed to obtain robust and accurate solutions at high swirl numbers. The results show that the LES is in good agreement with the experiment in terms of the recirculation flow, though the RANS simulation overestimates it. This is considered due to the capability of prediction of turbulent mixing. The effect of secondary and tertiary swirler vanes' angles on the behavior of the recirculation flow are also well predicted by the LES. The recirculation flow affects the flame stabilization and combustion efficiency related to the particle residence time in the furnace. It can be said, therefore, that the LES is strongly recommended for the accurate prediction of the strong swirling flows in such furnaces.
关键词：Numerical Simulation;Turbulent Flow;Swirling Flow;LES;Coal Combustion Furnace