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力学系| 模型燃料机理构建方法等二则



主   办:力学系与湍流重点实验室
报告人:苟小龙、Prof. Wenting Sun (孙文廷)
时   间:5月12日(周五)上午9:00-
地   点:澳门太阳娱乐网站官网1#楼212会议室



 
报告一:模型燃料机理构建方法
 
报告人  苟小龙 教授
重庆大学 动力工程学院
时间:5月12日(周五)上午9:00-10:00
地点:澳门太阳娱乐网站官网1#楼212会议室
(从北大东门 沿成府路北侧向东200米、再向北200米到澳门太阳娱乐网站官网)


报告内容摘要:

实际燃料的成份复杂,其详细化学反应机理的基元组分与反应数目众多,且模型难以构建,给燃烧反应流的模拟分析带来了巨大障碍。以实际燃料主要成份及基本理化性质为基础,以具体研究目标为导向的模型燃料机理方法被证明是一条有效的解决途径。本报告将介绍用于复杂燃料燃烧反应流模拟的模型燃料机理构建方法。首先综述模型燃料机理及其构建方法的发展历史、典型的机理构建思路和当前存在的主要问题;然后将较详细地介绍本课题组提出的一种基于官能基团分析的模型燃料机理构建方法的思路、特点和应用情况;最后结合所提出的模型燃料机理构建方法介绍课题组正在开展的燃料设计研究工作的基本思路。报告将以具体燃料为基础,分析其燃料成份及基本理化性质对燃烧反应流特性的影响规律,讨论化学反应机理中的典型基元组分及基元反应在燃烧反应流模拟中的重要程度;并以多种复杂燃料为对象,介绍对应的模型燃料机理及其构建方法,基于不同工况下多个具体反应流的模拟结果分析模型燃料机理及构建方法的特点。报告还将简介在模型燃料机理的构建过程中以及使用复杂化学反应机理的燃烧反应流模拟中的机理简化、机理优化等处理手段的基本思路。
 
报告人简介:

苟小龙博士目前为重庆大学动力工程学院教授,1995年毕业于重庆大学热力系,获工学学士学位(热能动力工程专业、计算机应用专业);1998年和2003年于重庆大学动力工程学院分别获工学硕士学位和工学博士学位;2008年1月至2009年1月在美国普林斯顿大学机械与航空工程系任访问学者。

苟小龙教授长期从事热动力系统仿真、控制,以及燃烧动力学方面的教学和科研工作。现任中国系统仿真学会仿真器专业委员会委员。主持和参与各项科研课题60余项、发表论文80余篇、获权专利7项、获权软件著作权3项。苟小龙教授的主要研究方向包括燃烧过程的数值模拟、化学反应动力学及化学反应机理简化、热动力系统仿真与控制、清洁能源与可再生能源等。
 


 

报告二: Multiscale Modeling of Reacting Flows: from Tool Development to Turbulence-Combustion Interaction

报告人:  Prof. Wenting Sun (孙文廷)
Georgia Institute of Technology
时间: 5月12日(周五)上午10:00-11:00
地点:2138cn太阳集团古天乐 澳门太阳娱乐网站官网 1#楼212会议室
(从北大东门 沿成府路北侧向东200米、再向北200米到澳门太阳娱乐网站官网)

 

报告内容摘要:

A new numerical framework for DNS and LES of turbulent combustion is developed employing correlated dynamic adaptive chemistry (CoDAC), correlated transport (CoTran), and a point-implicit ODE solver (ODEPIM). The new framework is tested on a canonical turbulent premixed flame employing a real conventional jet fuel mechanism. The results show that the new framework provides a significant speed-up of kinetics and transport computation, which allows DNS/LES with large kinetic mechanisms, and at the same time maintains high accuracy and good parallel scalability. With the newly developed numerical tool, the sensitivity of predictions of DNS simulation to chemical kinetics models was investigated. Two different kinetics models, GRI-Mech 3.0 and an 11-species syngas model, are compared by performing 3D finite-rate kinetics-based direct numerical simulations (DNS) of a temporally evolving turbulent non-premixed syngas flame. Both chemical kinetics models, providing comparable qualitative trends, capture local extinction and re-ignition events. However, significant quantitative discrepancies (86~100 K difference in the temperature field) indicate high sensitivity to the chemical kinetics model. Detailed analysis shows that the 11-species model predicts a lower radicals-to-products conversion rate, causing statistically more local extinction and less re-ignition. This sensitivity to the chemical kinetics model is magnified relative to a 1D steady laminar simulation by the effects of unsteadiness and turbulence, with the deviations in species concentrations, temperature, and reaction rates forming a nonlinear positive feedback loop under reacting flow conditions.  

报告人简介:

Dr. Wenting Sun is currently an assistant professor of Georgia Institute of Technology, School of Aerospace Engineering. He received his B.E/M.E degrees from Tsinghua University, Department of Engineering Physics in 2005 and 2007, respectively, and Ph.D degree from Princeton University, Department of Mechanical and Aerospace Engineering in 2013. His current research focuses on combustion kinetics, model reduction, plasma-assisted combustion, and laser diagnostics. He has been awarded the Bernard Lewis Fellowship from the Combustion Institute, and Distinguished Paper Award at the 33rd International Symposium on Combustion. He is a 2016 Air Force Office of Scientific Research Young Investigator Program Awardee.
 

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