随机模型与浸入边界法相结合的空气雾化流场数值模拟研究

项目名称： 随机模型与浸入边界法相结合的空气雾化流场数值模拟研究

项目编号： No.51506216

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 能源与动力工程

项目作者： 邓甜

作者单位： 中国民航大学

项目金额： 21万元

中文摘要： 雾化效果直接影响气液掺混质量，是决定高性能燃烧室的关键。空气雾化喷嘴是航空燃气轮机和超燃冲压发动机燃烧室常采用的喷嘴。然而，由于空气雾化流场的高速湍流中影响和控制雾化的因素很多，雾化流场是瞬态密集型喷雾，不易观察和测量，雾化机理研究还很有限。本项目以空气雾化流场特性为研究对象，对气-液雾化流场特征及雾化机理进行基础科学研究，开发结合浸入边界法的随机模型。具体内容包括：理论分析与计算空气雾化流场中气液相界面存在形态和运动规律以及气液相间作用规律；研究空气雾化流场内液滴破碎机理、运动规律和液滴间的碰撞影响；研究气液多流场的计算模型；通过多组工况下空气雾化流场的实验测量，建立射流进口条件与喷雾张角、液核长度、液滴尺寸分布、液滴运动速度分布等雾化结构之间的规律。本项目旨在揭示空气雾化流场的雾化规律，建立结合浸入边界法的随机模型，为航空燃气轮机和超燃冲压发动机的设计研制奠定理论和技术基础。

中文关键词： 气液两相流动；雾化；数值模拟；随机模型；侵入边界法

英文摘要： Atomization affect directly the gas-liquid mixing, and play an important role on the high performance combustor. The air-blast atomization is often used in aero-engine and scramjet. However, because of the fast gas flow velocity and the dense liquid droplets clouds, it is difficult to observe and measure the atomization processes, the atomization mechanism is still unclear now. This project will focus on the air-blast atomization, research the gas-liquid flow field characteristics and atomization mechanism, develop a stochastic model coupled with Immersed Boundary Method, which contains: analyze and calculate gas-liquid interface and their interaction; research breakup and collisions of droplets; develop a numerical model for air-blast atomization; set up an experimental system to find the relations between the inlet conditions and the.spray angle, the length of liquid core, the distributions of the sizes and velocities of droplets. The purpose of this project is to find the atomization mechanism in air-blast atomization and develop a stochastic model combined with the Immersed Boundary Method, which will be then a theoretical and technical foundation for aero-engine and scramjet.

英文关键词： gas-liquid two-phase flow;atomization;numerical simulation;stochastic model;immersed boundary method