Predictability of detonation wave dynamics in gases: experiment and model development

气体中爆轰波动力学的可预测性：实验和模型开发

• 批准号: RGPIN-2017-04322
• 负责人: Radulescu, Matei
• 金额: $ 4.01万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=709230
• 关键词: Predictability; detonation; wave; dynamics; gases

Detonation waves are self-sustained supersonic combustion waves. These waves can be sustained in most energetic media including reactive gases. For safety applications, it is thus desirable to have the predictive capability for the eventual ignition of a detonation wave and for its propagation limits when different mitigation strategies are used. Likewise, propulsion applications of detonation waves (e.g., rotating detonation engines, pulse-detonation engine, oblique detonation engine) require accurate control of the wave initiation and stability. For all practical purposes, the detonation behavior needs to be predicted on scales on the order of meters (engine geometry, detonation arrestors, industrial facility configuration, etc...), whereas the detonation wave thickness phenomena occur at scales comparable to the molecular mean free path, i.e. less than a micron. The detonation phenomenon is thus an inherent multi-scale problem, with multi-scale physics. Adequate predictability of detonation wave dynamics is not currently possible at engineering scales. Achieving such predictability is the main thrust of my long-term research program on gaseous detonations. The research program applied for is a state-of-the-art multi-scale experimental and theoretical investigation of the phenomena controlling the reaction rates in detonation waves. Well-posed experiments at various scales of observations (the micro, meso and engineering scales) will permit to formulate and calibrate proposed closure models. At small scales, the influence of non-equilibrium effects and stochasticity stemming from molecular fluctuations will be studied in thermal ignition problems and compared with carefully designed experiments of critical ignition. At the meso-scale, our recently proposed Large Eddy Simulation strategy aimed at properly addressing both auto-ignition and turbulent mixing will be calibrated from the micro-scale experiments and simulations and tested against meso-scale dynamics of unstable detonation limits. Finally, the meso-scale experiments and simulations will permit the development and calibration of macro-scopic models at engineering scales for the appropriate global reaction rate in detonation waves. The outcome of the proposed research program is two-fold. Firstly, the development of a predictive capability of detonation related problems at the macro-scale engineering level through a bottom-up approach will find use in the prediction of such phenomena in the propulsion technology development and petro-chemical safety assessments. Secondly, and most importantly, it will provide training to students with the state-of-the-art solution methodologies in the field.

爆轰波是自持的超声速燃烧波。这些波可以在包括反应气体在内的大多数高能介质中持续存在。 因此，对于安全应用，期望具有在使用不同缓解策略时对爆震波的最终点燃及其传播极限的预测能力。同样，爆震波的推进应用（例如，旋转爆震发动机、脉冲爆震发动机、倾斜爆震发动机）需要精确控制波的起始和稳定性。对于所有实际目的，爆轰行为需要在米量级的尺度上预测（发动机几何形状、爆轰抑制器、工业设施配置等），而爆震波厚度现象发生在与分子平均自由程相当的尺度上，即小于1微米。 因此，爆炸现象是一个固有的多尺度问题，具有多尺度物理学。在工程规模上，目前还不可能充分预测爆震波动力学。 实现这种可预测性是我对气体爆炸的长期研究计划的主要目标。 申请的研究项目是对控制爆轰波反应速率现象的最先进的多尺度实验和理论研究。 在各种观测尺度（微观、中观和工程尺度）的适定实验将允许制定和校准拟议的闭合模型。 在小尺度上，非平衡效应和随机性的影响，源于分子波动将在热点火问题进行研究，并与精心设计的临界点火实验进行比较。在中尺度上，我们最近提出的大涡模拟策略，旨在妥善解决自燃和湍流混合将校准从微观尺度的实验和模拟和测试对中尺度动力学的不稳定爆震极限。 最后，中尺度的实验和模拟将允许在工程规模的宏观模型的开发和校准适当的全球反应率在爆轰波。 拟议的研究计划的结果是双重的。 首先，通过自下而上的方法在宏观尺度工程水平上开发与爆炸相关的问题的预测能力，将在推进技术开发和石化安全评估中预测此类现象中找到用途。 其次，也是最重要的一点，它将为学生提供该领域最先进的解决方案方法的培训。