UNS: Investigations on Hydrodynamic and Diffusional-thermal Flamefront Instabilities

1510142 （Law）该项目旨在更好地了解燃料-空气混合物是如何在高压和非常湍流的条件下燃烧的，类似于发动机。首席研究员最近开发了一种实验方法，可以获得以前无法获得的非常高分辨率的数据。这些数据可以帮助解释燃烧的行为，并有可能帮助设计节能燃烧装置。研究生和本科生都将参与拟议的研究，所获得的知识将在课堂上发表和教授。提出的研究旨在区分流体动力和扩散热不稳定性的影响，特别是在高压（60-80个大气压）下。由于火焰厚度随压力的增加而减小，高压往复式和燃气轮机内燃机的水动力不稳定性与之相关。为了提高压缩比从而提高这些发动机的燃烧效率，进一步加剧了流体动力学不稳定性的优势。PI为研究设计了层流火焰条件，但这些条件将影响经典湍流预混状态图，并可能对其进行修改。新开发的具有高时间和空间分辨率的诊断工具将有助于获得高质量的数据，从而验证所提出的假设。

1510142 (Law)The project aims to better understand how burning of fuel-air mixture takes place under high-pressure and very turbulent conditions, similar to those in an engine. The Principal Investigator has recently developed an experimental method that enables obtaining data with very high resolutions that was not previously available. The data can help explain the behavior of combustion and potentially help design energy-efficient combustion devices. Both graduate and undergraduate students will be involved in the proposed research and the knowledge gained will be published and taught in the classroom.The proposed study is aim to differentiating the effects due to hydrodynamic and diffusive-thermal instabilities, especially under high pressures (60-80 atmospheres). Because of the reduced flame thickness with increasing pressure, hydrodynamic instability is relevant to high-pressure reciprocating and gas turbine combustion engines. The interest to increase the compression ratio and thereby combustion efficiency of these engines further accentuates the preponderance of the hydrodynamics instability. The PI designs the laminar flame conditions for investigation, but these conditions will impact, with possible revisions to, the classical turbulent premixed regime diagram. Newly developed diagnostic tools with high temporal and spatial resolutions will help to obtain high-quality data that allows validations of the proposed hypothesis.