气固两相旋流燃烧的直接数值模拟

项目名称： 气固两相旋流燃烧的直接数值模拟

项目编号： No.51276164

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 能源与动力工程

项目作者： 邱坤赞

作者单位： 浙江大学

项目金额： 80万元

中文摘要： 基于对目前雷诺时均模拟和大涡模拟在两相燃烧研究方面的现状与发展趋势的分析和思考，提出采用直接数值模拟对单相和气固两相旋流燃烧的基础问题进行研究。直接数值模拟是一种高精度的研究手段，对流动和燃烧的研究来说，具有特别的优势。本项目的着力点首先放在气固两相燃烧直接数值模拟方法的发展上，其中包括三维两相可压缩反应流动大规模并行计算算法、颗粒燃烧模型、两相无反射特征边界条件等；然后开展单相和两相旋流过程中涡破裂、不稳定性规律以及颗粒与流体的相互作用等；最后对气固两相旋流燃烧的稳燃机理和多场相互作用规律进行剖析和诠释。上述研究工作的完成可望实现：1）澄清旋流火焰中湍流与火焰结构的相互作用；2）获取气相和颗粒相的瞬态和统计信息，建立可靠的两相燃烧直接数值模拟数据库；3）揭示气相和气固两相旋流燃烧的火焰特性、稳燃烧机理和多场多尺度耦合规律。为气固两相旋流燃烧的机理分析和优化设计提供新的理论分析方法和手段。

中文关键词： 旋流；燃烧；气固两相流；直接数值模拟；大涡模拟

英文摘要： After analyzing and considering the current developmental tendency based on the fundamental researches, which are related with the Reynolds Averaged Numerical Simulation (RANS) and Large Eddy Simulation (LES) focused on the gas-solid combustion. The proposal is trying to make use of Direct Numerical Simulation (DNS) for exploring and investigating the combustion instability and characteristic of the basic problems in gas-solid swirling combustion. DNS, which is a high-resolution numerical method, has great advantages in investigation, especially for fluid flow and combustion. The proposal try to improve a numerical simulation method for compressible reacting flow, including massive parallel computing algorithm, particle collision and combustion model, two-phase no reflection boundary conditions, etc. Then, investigate the vortex's structure, instability, evolution, fraction, and the interaction between phases. Last, the stable mechanism, flame propagation of gas-solid swirling combustion and particles' distribution will be investigated and explained. A fourth-order explicit Rungee-Kutta method for time integration, an eighth-order central differencing scheme for spatial discretization are used to solve the full Navier Stokes equation system and a 19-step reduced mechanism and point source for combustion is adop

英文关键词： swirl flow；combustion；gas-solid two-phase flow；direct numerical simulation；large eddy simulation