Investigation of Nonpremixed, Reacting Turbulent Flows

该计划是PI目前使用直接数值模拟（DNS）研究化学反应湍流的延续。为了研究微分扩散和热释放对湍流混合的小尺度结构和湍流中的化学反应的影响，pi们建议扩大他们目前的努力。具体来说，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。不考虑放热效应。(2)空间演化的近似均匀湍流与化学反应的DNS。热释放效果将包括在内。本文将考察条件封闭模型（CMC）在灭绝附近的适用性，以及CMC模型的自由基预测能力。(3)具有化学反应的空间演化湍流射流的DNS。将考虑热释放和一步化学反应，以及CMC模型中横坐标上条件矩无关的重要假设。

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.