受限空间内高强度小尺度湍流与燃烧相互作用机理的多场多组分高时空分辨激光光谱可视化研究

本项目针对重大研究计划指南中的第二个核心科学问题“受限空间内复杂湍流和燃烧相互作用”，拟在受限空间预混高速射流火焰中开展高强度小尺度湍流与燃烧相互作用机理的研究。通过开发新的燃烧诊断技术并结合已有实验手段，建立面向发动机湍流燃烧的多场多组分激光光谱可视化实验平台。通过高时空分辨激光诱导荧光和激光瑞利散射等技术，获得受限空间湍流燃烧的精细结构，并在此基础上计算相应的定量化湍流燃烧参数，建立受限空间湍流燃烧实验数据库。揭示不同燃料、不同湍流强度以及受限空间多物理参数对于湍流燃烧的影响规律，阐明受限空间内湍流和燃烧相互作用机制。为发动机湍流燃烧模型的开发奠定实验基础，为数值模拟提供实验验证。该项目对于推动激光光谱技术在发动机燃烧中的应用，丰富发动机燃烧表征手段，促进多学科交叉，提高发动机基础燃烧研究水平具有重要的意义。

Following the guidance of the Major Research Plan especially the 2nd core scientific issue, i.e. Interaction between complex turbulence and combustion in a confined space, the research plan of this proposal focus on the understanding of the governing mechanism of complexed highly turbulent combustion in confined space regarding the detailed flame front structure severely stirred by small scale eddies. Novel laser combustion diagnostic techniques will be developed and combining with the well-developed techniques a comprehensive setup will be established aiming at providing visualization of complexed turbulent flame structures relevant to internal combustion engine applications using simultaneous two-dimensional imaging of multi-species. Detailed fine structures of the turbulent combustions in confined space will be revealed using high resolution laser-induced fluorescence and laser Rayleigh scattering. These high quality data will be extensively analyzed to provide crucial parameters and quantitative descriptions of the under investigated turbulent combustion conditions, and consequently form an integrated database serving the establishment of comprehensive models and CFD validation. Different fuels, turbulent intensities, and physical parameters of the confinements will be investigated to reveal the complexed interaction mechanism. This work will form reliable experimental fundamentals for turbulent engine combustion models and numerical simulations. The proposal will also promote the effective application of comprehensive state-of-the-art laser combustion diagnostic techniques to engine combustion research so as to improve the interpretation methodology and improve the interdisciplinary research in engine combustion and eventually serving the substantial improvement of the fundamental engine combustion research level in our country.