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中文摘要：
针对较低Reynolds数下的射流火焰，使用直接数值模拟（DNS）数据，研究单条件矩和双条件矩封闭模型应用于此类火焰计算的特点和可行性．结果表明，单条件矩封闭模型在较小标量耗散率下能够较好地预测火焰结构，但在较大标量耗散率下则过高估计了火焰温度．双条件矩封闭模型可以改善预测精度，其模型系数α0、β0和γ0具有稳态特点．
英文摘要：
Databases generated by direct numerical simulation （DNS） of non-premixed combustion at moderately low Reynolds numbers are used to evaluate the first-conditional moment closure （CMC） models of jet flames. Results show that the singly conditional moment closure model can well describe flame structure at moderately low scalar dissipation rates, but will overpredict flame temperature at rather high scalar dissipation rates, which indicates that the singly conditional moment closure model is unable to describe extinction events. A new conditional moment closure strategy using scalar dissipation rate as a second conditioning variable is able to well describe flame structure at any scalar dissipation rate. It is found that the nonconstant coefficients α0 ,β0 and To in the doubly conditional moment closure modeling governing equations vary little with time. Furthermore, β0 and To can be ignored compared with γ0.
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