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

爆轰波是一种非常快速的高压高温现象，其中冲击波最初引发化学反应。它们的暴力性质使它们成为一个感兴趣的主题，无论是从缓解的角度来看，工业环境将被这种波的意外形成所破坏，还是高效先进推进系统的组成部分。该提案对前者最感兴趣，后者最近开始以旋转爆震发动机（RDE）的形式实现。鉴于该装置的连续操作，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震的静态均匀环境非常不同。在这种情况下，喷射在波之前产生大量湍流，并且新鲜反应物和最近燃烧的产物之间的剪切层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，必须对爆震波的基本结构有更多的了解，特别是对结构不规则的爆震，因为最有可能的候选燃料会产生这种波。该建议旨在研究代表RDE操作的环境以及探测爆震波的内部结构以揭示其基本尺度。设计了一个新颖的实验，其中平面爆轰波以掠射的方式与具有受控强度的湍流片相互作用。将使用这种新的实验配置和相同实验装置的数值模拟相结合，研究规则和不规则爆震波的传播动力学受到影响的条件和方式。结合探索的爆轰波与外部源的旋涡运动的相互作用，这一建议奠定了基础，仔细检查的作用，自生湍流内的爆轰结构本身。这是通过偏离目前使用的平均方法，而是采用采样方法，其中大量的拉格朗日粒子通过爆震结构。该方法将在Euler和Navier-Stokes方程的数值模拟上实现。使用拉格朗日采样信息的依赖性反应速率湍流混合可以推断和实施下一代工程模型的爆轰波。

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.