UNS: Collaborative Research: Turbulent Flame Structure of Cavity Stabilized Reacting Shear Layers: Effects of Flow Compressibility, Heat Release, and Finite-rate Kinetics

1511791（Chelliah）/1511520（Cutler）/1510222（Edwards）高速和超音速燃烧对高速运输至关重要。 由实验人员和数值建模人员组成的研究小组将尝试使用独特的设施和最先进的数值模型来了解燃料如何以如此高的速度燃烧以及如何实现稳定的燃烧。 一个由本科生和研究生组成的团队将参与这项研究，数据和结果将被广泛发表。为了理解火焰稳定机制，需要理解由释放热量的化学反应和流动之间的相互作用产生的火焰结构。 在高速条件下，流动是湍流的。 该建议的重点是在超音速条件下的这种相互作用，压缩性也发挥了作用。 所选择的流动几何形状是空腔上方的高速反应剪切流，这通常被认为是超声速燃烧和推进的良好候选者。拟议的设施（位于主要PI的机构- UVa）是独特的，它已经在过去几十年中开发，并充分和适当地利用拟议的研究。火焰结构的基本数据和关键物种的统计数据将通过实验获得。使用DNS（直接数值模拟）的计算结果将补充实验，以提供额外的信息无法从开发子模型的实验，可用于未来的高速推进燃烧室的发展。实验数据具有档案价值。与政府实验室研究人员的密切合作可能会扩大其实用性。

1511791(Chelliah)/1511520(Cutler)/1510222(Edwards)High-speed and supersonic combustion is of vital importance to high-speed transport. The research team comprised of experimentalist and numerical modelers will try to understand, using a unique facility and state-of-art numerical models, how fuel burning at such high speed happens and how stable combustion can be achieved. A team of undergraduate and graduate students will be involved in the research and the data and results will be widely published. To understand the flame stabilization mechanism requires the understanding flame structure resulting from the interaction between the chemical reaction, which releases heat, and the flow. Under high-speed conditions, the flow is turbulent. The proposal focuses on this interaction under supersonic conditions where compressibility also plays a role. The flow geometry chosen is high-speed reacting shear flow over cavity, which is commonly believed to be a good candidate for supersonic combustion and propulsion. The proposed facility (located at the lead PI's institution - UVa) is unique, which has been developed over the past decades and is well and appropriately leveraged for the proposed research. Fundamental data on flame structure and statistics on key species are to be obtained experimentally. Computational results using DNS (Direct Numerical Simulation) will supplement the experiments to provide additional information not accessible from experiments in developing submodels, which can be used in the future development of high-speed propulsion combustors. The experimental data are of archival value. Close collaboration proposed with researchers from government labs would likely amplify its usefulness.