Fundamental Detonation Characteristics and their Influ- ence in Rotating Detonation Engines

旋转爆震发动机的基本爆震特性及其影响

• 批准号: RGPIN-2018-06710
• 负责人: Kiyanda, Charles
• 金额: $ 1.97万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=681848
• 关键词: Fundamental; Detonation; Characteristics; their; Influ

Detonation waves are a very rapid, high pressure and temperature phenomenon within which shock waves initially trigger chemical reactions. Their violent nature makes them a subject of interest both from the point of view of mitigation, where industrial environments would be devastated by the accidental formation of such a wave, as well as a building block in high efficiency, advanced propulsion systems. This proposal is most interested in the former, which has recently started materializing in the form of the Rotating Detonation Engine (RDE). Given the continuous operation of the device, the detonation waves that are part of its core operation encounter an environment very different from the quiescent, homogeneous environment in which detonations are typically studied. In this case, injection creates substantial turbulence ahead of the wave and shear layers between fresh reactants and recently combusted products create turbulent structures that interact with the propagation of the wave. To tackle this harsh environment, more knowledge must be developed about the fundamental structure of detonation waves, especially for detonations with an irregular structure since the most likely candidate fuels would produce such a wave.******This proposal seeks to both study environments representative of the operation of an RDE as well as probe the internal structure of detonation waves to reveal its fundamental scales. A novel experiment is devised in which a plane detonation wave interacts in a grazing fashion with a sheet of turbulence of a controlled intensity. The conditions and manner in which the propagation dynamics of regular and irregular detonation waves are influenced will be studied using a combination of this new experimental configuration and numerical simulations of this same experimental setup.******In conjunction with the exploration of the interaction of a detonation wave with an outside source of vortical motion, this proposal lays the foundation for a careful examination of the role of self-generated turbulence within the detonation structure itself. This is done by departing from the currently used averaging methods and, instead, employing a sampling method in which a large number of Lagrangian particles are followed through the detonation structure. This method will be implemented on numerical simulations of the Euler and Navier-Stokes equations. Using Lagrangian sampling information about the dependence of reaction rates on turbulent mixing can be inferred and implemented in next-generation engineering models of detonation waves.

爆震波是一种非常快速、高压和温度很高的现象，冲击波最初会在其中引发化学反应。它们的暴力性质使它们成为一个感兴趣的主题，既从缓解的角度来看，工业环境将被这种波的意外形成摧毁，也使它们成为高效、先进推进系统的基石。这项提议对前者最感兴趣，后者最近开始以旋转爆震发动机(RDE)的形式出现。考虑到装置的持续运行，作为其核心操作的一部分的爆震波遇到的环境与通常研究爆炸的静止、均匀的环境截然不同。在这种情况下，注入会在波前产生大量的湍流，新鲜反应物和最近燃烧的产品之间的剪切层会产生与波的传播相互作用的湍流结构。为了应对这种恶劣的环境，必须发展更多关于爆轰波基本结构的知识，特别是对于具有不规则结构的爆轰波，因为最有可能的候选燃料将产生这样的波。*本建议寻求既研究代表RDE操作的环境，又探测爆轰波的内部结构，以揭示其基本尺度。设计了一种新的实验，在该实验中，平面爆轰波以掠射的方式与强度可控的湍流片相互作用。我们将结合这一新的实验构型和相同实验装置的数值模拟来研究规则和不规则爆轰波的传播动力学受到影响的条件和方式。在探索爆轰波与外部涡动源相互作用的同时，这一建议为仔细研究爆轰结构内部自生湍流的作用奠定了基础。这是通过偏离当前使用的平均方法来实现的，取而代之的是采用采样方法，其中大量拉格朗日粒子被跟随穿过爆轰结构。该方法将在Euler方程和Navier-Stokes方程的数值模拟中实现。利用拉格朗日采样信息，可以推断出反应速率与湍流混合的关系，并在下一代爆轰波工程模型中实现。