Numerical Characterization of Effects of Addition of H2, CO, CO2 and H2O in High-Pressure Premixed Turbulent Flames

全球环境问题对严格控制排放的要求越来越高。这对发电部门来说具有紧迫的重要性。因此，重点已转向超低排放技术。相应地，燃烧工程师和科学家正在从非预混燃烧转向预混燃烧装置。拟议的项目旨在提高对预混湍流燃烧基本方面的物理理解，即(I)多组分燃料/空气混合物预混湍流火焰发展的大涡模拟研究，(Ii)高压对湍流燃烧速度的影响，以及(Iii)分子传输效应(Lewis数和优先扩散)对预混火焰特性的影响。具体地说，将考察上述三个因素对火焰特性的影响。这项研究将重点放在将稀释剂(H2、CO、CO2和H2O)添加到碳氢化合物混合物、生物燃料和合成气体中。在第二阶段的工作中，将建立稀释剂/碳氢化合物/空气混合物的通用湍流反应流动模型，并利用独立的实验数据库进行验证。数值研究将使用先进的大涡模拟技术，并将纳入各种燃烧模型。这项工作产生的任何改进的装置都将扩大能源资源多样化的范围。这项研究取得的进展将使英国工业部门在制定燃烧应用的设计指南方面发挥带头作用。此外，它的优点是实现了欧洲共同体实现独立于化石燃料使用的战略目标。

Global environmental concerns impose an increasing demand for stringent control of emissions. This is of pressing importance to the power generation sector. Accordingly, the emphasis has shifted to ultra-low emission technology. Correspondingly, combustion engineers and scientists are moving away from nonpremixed combustion to premixed combustion devices.The proposed project is aimed at improving the physical understanding of the fundamental aspects of premixed turbulent combustion, namely, (i) large-eddy simulation investigation of premixed turbulent flame development of multi-component fuel/air mixtures, (ii) influence of high-pressure on turbulent burning velocities, and (iii) the molecular transport effects (the Lewis number and preferential diffusion) on premixed flame characteristics. Specifically, it will examine the above named effect of the three factors on the flame characteristics. The study will focus on addition of diluents (H2, CO, CO2 and H2O) to hydrocarbon mixtures, biofuels and synthetic gas. In the second phase of the work, a universal turbulent reacting flow model for diluent/hydrocarbon/air mixtures will be developed and validated against independent experimental databases.Numerical investigations will be undertaken using advanced large-eddy simulation technique and will incorporate a variety of combustion models. Any improved devices arising from this work will enhance the scope for diversifying energy resources. Advances resulting from this study should enable the UK industrial sector to take a lead in developing design guidelines for combustion applications. Additionally, it has the merit of meeting the strategic objectives of the European Community in achieving independence from the use of fossil fuels.