Coupling of a direct quadrature based sectional method of moments with Large Eddy Simulation (LES) for describing polydisperse reacting spray systems

基于直接求积的截面矩法与大涡模拟 (LES) 的耦合用于描述多分散反应喷雾系统

• 批准号: 427460734
• 负责人: Professor Dr. Amsini Sadiki
• 金额: --
• 依托单位: Fachgebiet Energie- und Kraftwerkstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/427460734?language=en
• 关键词: Coupling; direct; quadrature; based; sectional

The main objective of this proposal is to develop, validate and evaluate an advanced Eulerian-Eulerian method in which the flow and mixing field in the gas phase is described using LES, while the Direct Quadrature based Sectional Method of Moments (DQbSMOM) is used to track the evaporating droplet phase in an Eulerian framework. The DQbSMOM has recently been introduced by the applicant in the RANS context and successfully applied to describe satisfactorily complex reacting polydisperse spray systems. The first issue of this proposal consists of an appropriate description of DQbSMOM in the LES framework. The emerging LES based Eulerian-Eulerian model will be then extended to include fuel atomization processes. Thereby, the so-called ELSA (Eulerian-Lagrangian Sheet Atomization) liquid atomization model will be appropriately considered in order to complete the already integrated coalescence (droplet-droplet interaction) model. In this way, the essential phenomena comprising primary breakup, droplet-droplet interactions, turbulent dispersion, evaporation and combustion processes will be incorporated for the first time. The final issue will address the coupling of the resulting LES-based Eulerian-Eulerian model with a tabulated Chemistry description of the combustion. The latter relies on a spray flamelet approach recently proposed in the literature. It will be adapted in the LES context along the Flamelet Generated Manifold (FGM) tabulation and further developed as Spray-FGM technique. The suggested Spray-FGM method accounts not only for the interaction chemistry/evaporating droplet and the non-adiabaticity but also for the Lewis number effects. With this the evaporation process and partial evaporation will be accounted for within the laminar flame structure during the chemistry tabulation.The resulting overall model will be validated and exemplarily assessed in configurations of different geometries. Two configurations of increasing complexity will be considered, namely a spray jet of ethanol (Masri configuration) and a complex n-heptane spray configuration (CORIA configuration) exhibiting a dense spray region. Both represent two target spray flames of the international workshop on „Turbulent Spray Combustion (TCS)“.

该提案的主要目标是开发、验证和评估一种先进的欧拉-欧拉方法，其中使用 LES 描述气相中的流动和混合场，同时使用基于直接求积的截面矩法 (DQbSMOM)申请人最近在 RANS 背景下引入了 DQbSMOM，并成功应用于描述令人满意的复杂反应多分散喷雾系统。该提案的第一期包括 LES 框架中对 DQbSMOM 的描述，然后将基于 LES 的欧拉-欧拉模型扩展到包括燃料雾化过程，从而形成所谓的 ELSA（欧拉-拉格朗日片原子化）液体雾化。将适当地考虑模型，以完成已经集成的聚结（液滴-液滴相互作用）模型，这样，包括初级破碎、液滴-液滴的基本现象。最后一期将首次纳入基于 LES 的欧拉-欧拉模型与燃烧的表格化学描述的耦合。最近在文献中提出的方法将在 LES 环境中沿火焰生成流形 (FGM) 表格进行调整，并进一步开发为喷射 FGM 技术。不仅适用于相互作用化学/蒸发液滴和非绝热性，还适用于路易斯数效应，在化学制表期间，将在层流火焰结构中考虑蒸发过程和部分蒸发。由此产生的整体模型将是。将考虑在不同几何形状的配置中进行验证和示例性评估，即乙醇喷雾（Masri 配置）和复杂的正庚烷喷雾配置。 （CORIA 配置）展示了密集喷雾区域。两者都代表了“湍流喷雾燃烧 (TCS)”国际研讨会的两个目标喷雾火焰。