湍流燃烧模型在燃烧室数值模拟中的对比分析

Comparison and Analysis of Turbulent Combustion Models in Numerical Simulation of Combustor

以某单头部矩形燃烧室为研究对象,采用多种湍流模型和燃烧模型进行组合计算,模拟燃烧室内部的速度场和温度场,并对计算结果进行对比分析。结果表明:湍流模型主要影响火焰筒内部主燃孔横截面上游的速度分布,Standard k-ε和Realizable k-ε模型的速度场计算结果差异相对较小;湍流动能预测受湍流模型的影响较大,并具有一定规律性;不同组合模型对燃烧室内部和出口温度分布的局部细节模拟差异较大,燃烧模型影响最大;PDF模型计算的温度值较合理,另外三种燃烧模型在单步完全反应燃烧机理下的计算值偏高,计算获得的OTDF也相差较大。

The inner velocity and temperature fields of a single-dome rectangular combustor were simulat-ed with various turbulence models and combustion models. Through comparison and analysis, it is foundthat the turbulence models are the main influential factor on the velocity distribution before the cross sec-tion of primary hole, the difference of velocity field results between the Standard k-ε model and the Realiz-able k-ε model is slight. The turbulence models mainly affect the turbulence kinetic energy and turbu-lence intensity, and the simulation results have a stated regularity. There is a big difference in the details ofcombustor inner and exit temperature distribution applying different combined models, the combustion mod-els play an important role in the result difference. The temperature value is simulated reasonably using PDFmodel, but the results got from the other three combustion models which used the global reaction mecha-nism are on the high side, the OTDF calculated from the results also have many differences.