颤振诱导不稳定涡对超声速反应混合层的混合增强机理研究

项目名称： 颤振诱导不稳定涡对超声速反应混合层的混合增强机理研究

项目编号： No.11272351

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 谭建国

作者单位： 中国人民解放军国防科学技术大学

项目金额： 82万元

中文摘要： 针对超声速反应混合层的特点，创新性地提出采用颤振诱导不稳定涡进行混合增强。利用高分辨率的PLIF、PIV、高速纹影、NPLS等设备，研究超声速反应混合层的精细时空结构，获得大尺度结构和湍流火焰界面在不同尺度下的自相似特征；通过对比研究无颤振、强迫简谐振动和颤振，无反应和有反应等情况下的流场结构，获得颤振/激波/混合层/燃烧之间的动力学耦合关系，进一步丰富超声速、非对称、反应流下的颤振涡理论；结合理论分析、大涡数值模拟和高分辨率光学观测，明晰颤振诱导不稳定涡的脱落模式、大尺度涡的演化规律、燃烧和激波对涡运动和变形的影响、大尺度涡的标量输运特性、混合层失稳特征等，最终揭示颤振诱导不稳定涡对超声速反应混合层的混合增强机理。 该项研究将加深对大尺度不稳定涡激发下的超声速反应混合层的认识，明确颤振增强混合的物理机制，为拓展这一新型混合增强措施的应用奠定基础。

中文关键词： 超声速混合层；混合增强；振动；流动不稳定性；燃烧

英文摘要： A novel method which employs unstable vortex induced by flutter is brought forward to enhance mixing, based on the characteristics of supersonic reactive mixing-layer. High definition PLIF, PIV, high-speed Schlieren and NPLS will be applied in this project. According to the detailed temporal-spatial structure of the supersonic reactive mixing-layer, self-resemble characteristic of macro-structure and turbulent flame will be extracted. By comparing non-flutter, forced harmonic vibration and flutter, comparing non-reaction and reaction, dynamic couple of flutter/shock-wave/mixing-layer/combustion will be obtained. This will enrich the theory of flutter vortex under the conditions of supersonic, unsymmetrical and reactive flow. Applying both theoretical analysis and LES and optical measurements, several physical topics will be discussed, such as shedding modes of the unstable vortex induced by the flutter, evolution rules of the macro vortex, the effects of combustion and shock wave on the movement and transformation of the vortex, scalar transportation with the vortex and instability characters of the mixing-layer. Based on all of these facts, the mixing enhancement mechanism of unstable vortex induced by flutter in supersonic reactive mixing-layer will finally be disclosed. This project will be helpful for under

英文关键词： supersonic mixing layer；mixing enhancement；flutter；flow instability；combustion