Characterization of Scalar Correlations In Turbulent Counterflow Nonpremixed Flames

湍流逆流非预混火焰中标量相关性的表征

• 批准号: 0106231
• 负责人: Normand Laurendeau
• 金额: $ 27.2万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0106231&HistoricalAwards=false
• 关键词: Characterization; Scalar; Correlations; Turbulent; Counterflow

This is a study of scalar fluctuations in turbulent jet flames. Spatial and temporal structures are studied in a simplified counterflow geometry. The geometry is conducive to direct comparison between quantitative experimental results and advanced turbulent combustion models such as large-eddy simulations. A modular burner consisting of two opposed jets and providing a range of turbulent flow conditions is used. Quantitative laser diagnostics are applied to a series of flames in this burner to recover the time dependence of OH and CH concentrations, temperature, and mixture fraction. Velocity measurements are obtained on an identical burner at Technische Universitat Darmstadt. A set of simultaneous velocity and concentration measurements are made at Wright-Patterson Air Force Base. Using a simulation technique developed by the investigators, relationships between spatial and temporal correlations are examined quantitatively.Time-series measurements of concentrations of minor species in turbulent jet flames have been made recently. These single-point measurements permit study of time-scale statistics and are analogous to spatial-scale imaging. However, unknown mixing statistics in the jet flames complicate interpretation of these data.

这是对湍流喷射火焰中的标量波动的研究。 在简化的逆流几何中研究空间和时间结构。 该几何形状有利于定量实验结果与大涡模拟等先进湍流燃烧模型之间的直接比较。 使用由两个相对的喷嘴组成并提供一系列湍流条件的模块化燃烧器。 定量激光诊断应用于该燃烧器中的一系列火焰，以恢复 OH 和 CH 浓度、温度和混合分数的时间依赖性。 速度测量是在达姆施塔特工业大学的相同燃烧器上获得的。 赖特-帕特森空军基地进行了一组同步速度和浓度测量。 使用研究人员开发的模拟技术，定量检查空间和时间相关性之间的关系。最近对湍流喷射火焰中次要物种的浓度进行了时间序列测量。 这些单点测量允许研究时间尺度统计数据，并且类似于空间尺度成像。 然而，喷射火焰中未知的混合统计数据使这些数据的解释变得复杂。