Investigation of Nonpremixed, Reacting Turbulent Flows

KOSALY CTS-9415280摘要 建议的程序是PI的化学反应湍流的直接数值模拟（DNS）的当前调查的延续。 PI建议扩展他们目前的努力，以研究微分扩散和热释放对湍流混合和湍流中化学反应的小尺度结构的影响。 具体地说，研究将包括DNS在以下湍流、非预混反应流中的应用： (1)具有化学反应和微分扩散的均匀衰减湍流的DNS。 未考虑热释放效应。 (2)具有化学反应的空间演化的近似均匀湍流的DNS。 将包括热释放效应。 将审查的条件封闭模型（CMC）的适用性濒临灭绝的CMC模型的激进的预测能力。 (3)具有化学反应的空间演化紊流射流的DNS。 热释放和一步化学反应将被认为是将CMC模型中的横向坐标上的条件矩的独立性的重要假设。

ABSTRACT KOSALY CTS-9415280 The proposed program is a continuation of the PI's current investigations of chemically reacting turbulent flows using direct numerical simulation (DNS). The PIs propose to extend their present effort in order to investigate the effects of differential diffusion and heat release on the small scale structure of turbulent mixing and chemical reactions in turbulence. Specifically the investigation will include the application of DNS to the following turbulent, non-premixed reacting flows: (1) DNS of homogeneous, decaying turbulence with chemical reaction and differential diffusion. No heat release effects considered. (2) DNS of spatially evolving, approximately homogeneous turbulence with chemical reaction. Heat release effects will be included. The applicability of the conditional closure model (CMC) near extinction will be examined as will the radical prediction capability of the CMC model. (3) DNS of a spatially-evolving, turbulent jet with chemical reaction. Heat release and a one step chemical reaction will be considered as will the important assumption of the independence of the conditional moments on the transverse coordinate in the CMC model.