Acquisition of a High-Energy, Narrow Linewidth Laser for Gas-Phase Scalar Mixing Studies in Turbulent Spray Flows

获取高能、窄线宽激光器，用于湍流喷雾流中的气相标量混合研究

• 批准号: 0853513
• 负责人: Jeffrey Sutton
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0853513&HistoricalAwards=false
• 关键词: Acquisition; Energy; Narrow; Linewidth; Laser

0853513SuttonThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). This is small equipment grant for the acquisition of a high-energy, narrow-linewidth, injection-seeded Nd:YAG laser. This instrument will be the primary component for advanced imaging studies to investigate the gas-phase scalar mixing in turbulent spray flows. Probably the best known examples of turbulent sprays exist in practical energy conversion systems where a liquid fuel issues into an oxidizing environment, disperses, evaporates, and mixes with the oxidizer before reacting. Although these systems are complicated by several physical and chemical processes, they are ultimately limited by the rate that liquid fuel evaporates and the fuel vapor mixes with the oxidizer at the finest physical length scales. Gas-phase scalar mixing, while studied in-depth for single-phase turbulent flows, has not been studied extensively in multiphase flow environments primarily due a lack to reliable experimental techniques that can determine the gas-phase concentration with sufficient accuracy. The PI intends to use the procured laser to validate a new experimental methodology for a novel variation of the Filtered Rayleigh Scattering (FRS) imaging technique to quantitatively measure the vapor-phase scalar concentration discriminately in the presence of liquid-phase droplets. Important quantities such as the gas-phase mixture fraction, which describes the degree of mixing between two non-premixed streams, and the scalar dissipation rate, which describes the that the two streams mix, may be derived without interference from the droplets. Such measurements are crucial for understanding the fundamental physics describing the evaporation of the liquid phase and the subsequent mixing of the vapor phase. In addition, these measurements will provide valuable assessment and development support for Large-Eddy Simulation modeling of turbulent sprays. Multiphase turbulent flows are of significant interest in many engineering applications including direct-injection automotive engines, liquid-propellant rocket engines, industrial furnaces, and water-mist fire-suppression systems. A graduate student will be supported directly by the PI to develop and implement the gas-phase scalar measurement technique. Every effort will be made to include the participation of students classified as underrepresented including women and ethnic minorities.

0853513Sutton 该奖项根据 2009 年美国复苏和再投资法案（公法 111-5）提供资金。这是一笔小额设备赠款，用于购买高能、窄线宽、注入种子 Nd:YAG 激光器。该仪器将成为先进成像研究的主要组成部分，以研究湍流喷雾流中的气相标量混合。湍流喷雾最著名的例子可能存在于实际的能量转换系统中，其中液体燃料进入氧化环境，在反应前分散、蒸发并与氧化剂混合。尽管这些系统因多种物理和化学过程而变得复杂，但它们最终受到液体燃料蒸发以及燃料蒸气与氧化剂在最精细物理长度尺度上混合的速率的限制。气相标量混合虽然对单相湍流进行了深入研究，但尚未在多相流环境中进行广泛研究，这主要是由于缺乏能够足够准确地确定气相浓度的可靠实验技术。 PI 打算使用采购的激光器来验证过滤瑞利散射 (FRS) 成像技术的新颖变体的新实验方法，以在存在液相液滴的情况下有区别地定量测量气相标量浓度。可以在不受液滴干扰的情况下导出重要的量，例如描述两个非预混合流之间的混合程度的气相混合分数和描述两个流混合的标量耗散率。此类测量对于理解描述液相蒸发和随后气相混合的基础物理至关重要。此外，这些测量将为湍流喷雾的大涡模拟建模提供有价值的评估和开发支持。多相湍流在许多工程应用中具有重要意义，包括直喷式汽车发动机、液体推进剂火箭发动机、工业炉和水雾灭火系统。研究生将直接得到 PI 的支持来开发和实施气相标量测量技术。我们将尽一切努力让被归类为代表性不足的学生（包括妇女和少数民族）参与其中。