Shock wave interactions in unsteady high-speed compressible flows

非定常高速可压缩流中的冲击波相互作用

• 批准号: RGPIN-2020-05107
• 负责人: Timofeev, Evgeny
• 金额: $ 1.97万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=740396
• 关键词: Shock; wave; interactions; unsteady; speed

The unifying theme of the proposed wide-scope research program is high-speed unsteady compressible flows with shock waves, which are much less studied as compared to their steady counterparts. Its long-term objectives are to study important basic and applied problems involving unsteady shock wave phenomena using the state-of-the-art flow solvers and to continue further development of these numerical tools as would be dictated by the problems under study.  The program encompasses three major research directions: (I) Fundamentals of unsteady shock wave reflections from various surfaces and transitions between different types of reflection: a number of issues related to physical mechanisms of these phenomena and interpretations of experimental observations have recently become a hot and contentious topic attracting many researchers; the proposed project is aimed at making crucial and decisive contributions to the debate; (II) Shock wave phenomena in multi-fluid media for two application areas: the implosion of a gas cavity driven by converging shock waves in liquid, which is highly relevant to the prospective nuclear fusion reactors based on the so-called magnetized target fusion;  and the shock wave propagation and cavitation bubble dynamics generated by laser pulse energy depositions in liquids, as encountered in medical applications of shock waves; (III) Starting of air intakes for next-generation hypersonic air-breathing engines (scramjets): novel intake starting techniques such as the ones based on the ideas of thin diaphragm rupture or so called "tractor-rocket" will be further studied with more realistic models aiming at finding the ways of their practical implementation. The main research tool of the program will be the set of high-resolution and efficient flow solvers developed earlier by the principal investigator. It is planned to be further developed for more accurate, efficient, and reliable treatment of the above problems. Analytical models will be developed as well. Furthermore, the principal investigator forged close collaborative ties with, arguably, world leaders in experimental diagnostics for some of the above research directions, who would supply their experimental data and additionally perform experiments suggested and designed by the principal investigator. Thus, all three nodes of scientific investigation will be fully engaged. The major outcomes are expected to be discoveries of both fundamental and practical nature in the chosen research areas delivered to research and engineering community via refereed publications in archival journals; extensive training of graduate/undergraduate students in stimulating and in many aspects unique research environment, and further development of general computer codes for unsteady gasdynamics of shocked flows, which are already in use by many researchers worldwide and would undoubtedly serve as a solid base for future research undertakings and practical applications of their results.

所提出的广泛研究计划的统一主题是带有冲击波的高速非定常可压缩流，与其稳定的优点相比，其研究要少得多，其长期目标是研究非定常冲击波的重要基础和应用问题。该计划涵盖三个主要研究方向：（I）基础知识。来自各种表面的非稳态冲击波反射以及不同类型反射之间的过渡：与这些现象的物理机制和实验观察的解释相关的许多问题最近已成为吸引许多研究人员的热门和有争议的话题； （二）多流体介质中的冲击波现象的两个应用领域：液体中会聚冲击波驱动的气腔内爆，这与未来的核聚变高度相关基于所谓的磁化靶聚变的反应堆；以及由激光脉冲能量沉积在液体中产生的冲击波传播和空化气泡动力学，如冲击波的医疗应用中所遇到的；（III）启动下一代高超音速的进气口；吸气式发动机（超燃冲压发动机）：新型进气启动技术，例如基于薄隔膜破裂或所谓的“牵引火箭”思想的技术，将得到更现实的进一步研究该项目的主要研究工具将是首席研究员之前开发的一套高分辨率和高效的流动求解器，计划进一步开发以实现更准确、更高效、更高效的模型。此外，首席研究员与上述一些研究方向的实验诊断领域的有争议的世界领导者建立了密切的合作关系，他们将提供他们的实验数据。进行主要研究者建议和设计的实验，因此，科学研究的所有三个节点都将充分参与，主要成果预计将是通过评审交付给研究和工程界的选定研究领域的基础性和实用性发现。在档案期刊上发表出版物；对研究生/本科生进行广泛的培训，在刺激和在许多方面独特的研究环境中，以及冲击流非定常气体动力学的通用计算机代码的进一步开发，这些代码已经被世界各地的许多研究人员使用，无疑将成为固体为未来的研究工作及其成果的实际应用奠定基础。