Development of scalar dissipation rate based reaction rate models for the large eddy simulations of premixed flames

本计画旨在发展一个有效的标量耗散率（SDR）为基础的反应率封闭的湍流预混火焰的大涡模拟（LES）。虽然SDR基于封闭的雷诺平均Navier Stokes（RANS）模拟的非预混火焰，他们是罕见的RANS和LES的湍流预混火焰，并没有详细的评估其在LES的性能是迄今为止。在这个项目中，SDR为基础的反应速率封闭将开发和同时评估的先验分析明确过滤直接数值模拟（DNS）数据，并在LES计算模型性能的后验评估，在配置的实验数据是可用的。根据同时进行的先验和后验分析，将开发新的模型，随后将评估其性能。最好的模型，然后将实施的LES代码湍流预混火焰建模。有效的基于SDR的反应速率闭合将为在贫预混模式下操作的可靠、更清洁和成本有效的燃烧装置（例如火花点火发动机、贫预混预蒸发（LPP）工业气体涡轮机燃烧器）提供稳健的基于CFD的设计工具。

This project aims to develop an efficient Scalar Dissipation Rate (SDR) based reaction rate closure for the Large Eddy Simulation (LES) of turbulent premixed flames. Although SDR based closures are well established for Reynolds Averaged Navier Stokes (RANS) simulations of non-premixed flames, they are rare for RANS and LES of turbulent premixed flames, and no detailed evaluation of their performance in LES is available so far. In this project, the SDR based reaction rate closures will be developed and simultaneously assessed by a-priori analyses of explicitly filtered Direct Numerical Simulation (DNS) data, and a-posteriori evaluations of model performances in LES calculations, in a configuration for which experimental data is available. Based on the simultaneous a-priori and a-posteriori analyses, new models will be developed and their performance will subsequently be assessed. The best models will then be implemented in a LES code for turbulent premixed flame modelling. An efficient SDR-based reaction rate closure will provide a robust CFD based design tool for reliable, cleaner and cost-effective combustion devices operating in lean premixed mode (e.g. Spark Ignition engines, Lean Premixed Pre-vaporised (LPP) industrial gas turbine combustors).