基于不同PDF的超声速扩散燃烧火焰面模型对比

推进技术 ›› 2015, Vol. 36 ›› Issue (2): 232-237.

基于不同PDF的超声速扩散燃烧火焰面模型对比

赵国焱,孙明波,吴锦水

国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙 410073,国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙 410073,国防科技大学高超声速冲压发动机技术重点实验室，湖南长沙 410073

发布日期:2021-08-15
作者简介:赵国焱(1990—)，男，硕士生，研究领域为高超声速推进技术。
基金资助:
霍英东教育基金；全国优秀博士学位论文基金(91116001)。

Comparison of Supersonic Diffusion Combustion Flamelet

Science and Technology on Scramjet Lab，National University of Defense Technology，Changsha 410073，China,Science and Technology on Scramjet Lab，National University of Defense Technology，Changsha 410073，China and Science and Technology on Scramjet Lab，National University of Defense Technology，Changsha 410073，China

Published:2021-08-15

摘要/Abstract

摘要： 为了研究混合分数概率密度函数对湍流扩散燃烧的影响，采用稳态火焰面模型描述超声速扩散燃烧过程，分别采用[β]-PDF和[δ]-PDF方法对层流火焰面数据库积分得到两种湍流火焰面数据库，并对比分析了湍流火焰面数据库。结合混合RANS/LES程序，利用DLR氢燃料超燃燃烧室算例进一步对比验证采用不同PDF方法生成的湍流火焰面数据库。研究结果表明，混合分数[β]分布数据库中间组分随混合分数方差变化大，采用混合分数[β]分布的算例计算结果脉动速度较大，与实验结果符合得更好。

关键词: 超声速扩散燃烧；概率密度函数；湍流火焰面数据库

Abstract: In order to study the effects of mixing fraction probability density function on the turbulent combustion，supersonic diffusion combustion was investigated based on steady flamelet model. Two turbulence flamelet databases obtained from ensemble averaging laminar flamelet database using [β]-PDF and [δ]-PDF，respectively，were compared. Furthermore，based on RANS/LES method，DLR(German Aerospace Center) hydrogen fueled scramjet combustor was intruduced to verify two different flamelet databases. It is found that intermediate component of the former database varies greater with variance of the mixture fraction. Compared with the [δ]-PDF，the fluctuating velocity of [β]-PDF is greater and it is in agreement with experimental results closely.

Key words: Supersonic diffusion combustion；PDF；Turbulence flamelet database

赵国焱,孙明波,吴锦水. 基于不同PDF的超声速扩散燃烧火焰面模型对比[J]. 推进技术, 2015, 36(2): 232-237.

ZHAO Guo-yan,SUN Ming-bo,WU Jin-shui. Comparison of Supersonic Diffusion Combustion Flamelet[J]. Journal of Propulsion Technology, 2015, 36(2): 232-237.