UNS: Investigations on Hydrodynamic and Diffusional-thermal Flamefront Instabilities

UNS：流体动力学和扩散热火焰前不稳定性的研究

• 批准号: 1510142
• 负责人: Chung Law
• 金额: $ 27.7万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1510142&HistoricalAwards=false
• 关键词: UNS; Investigations; Hydrodynamic; Diffusional; thermal

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.

1510142(法律)该项目旨在更好地了解燃料-空气混合物在高压和非常动荡的条件下如何燃烧，类似于发动机中的燃烧。首席调查员最近开发了一种实验方法，能够以以前没有的非常高的分辨率获得数据。这些数据可以帮助解释燃烧行为，并可能有助于设计节能燃烧装置。研究生和本科生都将参与这项拟议的研究，所获得的知识将在课堂上公布和教授。拟议的研究旨在区分流体动力不稳定性和扩散-热不稳定性的影响，特别是在高压(60-80大气压)下。由于火焰厚度随着压力的增加而减小，流体动力不稳定性与高压往复式和燃气轮机发动机有关。这些发动机对提高压缩比从而提高燃烧效率的兴趣进一步突出了流体动力不稳定性的优势。PI设计了用于研究的层流火焰条件，但这些条件将影响经典的湍流预混区域图，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，从而能够验证所提出的假设。