摘要
防火试验是最常用、最有效的发动机部件防火符合性验证方法,采用数值模拟的方法对发动机部件防火试验进行研究,可为开展发动机部件防火试验提供参考和指导。首先计算了不同湍流模型和燃烧模型组合下的NexGen燃烧器自由火焰分布,并将计算结果与已有实验结果对比,结果表明Realizable k-ε湍流模型结合混合分数PDF燃烧模型最适用于NexGen燃烧器火焰的数值模拟,同时得到了NexGen燃烧器出口指定位置的标准火焰分布(包括温度分布和热流密度分布);其次以此标准火焰分布为初始边界条件,研究平板部件对标准火焰的响应,得到平板部件表面的温度分布,研究结果表明,平板部件中心附近位置处的温度最高,最容易被烧蚀。
Fire test is the most common and effective method to verify the fire protect compliance of engine components.The numerical simulation method is used to study the fire test of engine components to provide reference and guidance for the fire test of engine components.Firstly,the free flame distribution of NexGen burner under different combination of turbulence model and combustion model was calculated,and compared the calculation results with the existing experimental results,the results show that the Realizable k-εturbulence model combined with the mixed fraction PDF combustion model is most suitable for the numerical simulation of NexGen burner flame.At the same time,the standard flame distribution(including temperature distribution and heat flux density distribution)at the specified position of NexGen burner is obtained.Secondly,with the standard flame distribution as the initial boundary condition,the response of the plate component to the standard flame is studied,and the temperature distribution on the surface of the plate component is obtained.The research results show that the temperature near the center of the flat part is the highest,and it is most easily ablated.
作者
尹莉萍
方鹏亚
单晨晨
YIN Li-ping;FANG Peng-ya;SHAN Chen-chen(School of Aeronautical Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450046,China)
出处
《机械工程与自动化》
2021年第3期11-13,共3页
Mechanical Engineering & Automation
基金
河南省科技攻关项目(19A460030)。
关键词
防火试验
数值计算
温度
热流密度
发动机部件
fire test
numerical calculation
temperature
heat flux density
engine components