Research Initiation Award: Hydrocarbon Vapor Measurements in Two-Phase Flows by Infrared Extinction

研究启动奖：通过红外消光测量两相流中的碳氢化合物蒸汽

• 批准号: 9010368
• 负责人: James Drallmeier
• 金额: $ 7万
• 依托单位: Missouri University of Science and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-15 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9010368&HistoricalAwards=false
• 关键词: Research; Initiation; Award; Hydrocarbon; Vapor

Fuel spray vaporization is a crucial phase in the operation of liquid fuel combustion devices. At present there is a lack of studies of evaporating sprays with quantitative measurements of the vapor phase distribution, a result of the limitations of the measurement techniques available for measuring vapor. A nonintrusive, laser based, infrared extinction technique has been developed based on the strong absorption of incident radiation at a 3.39 wavelength by hydrocarbon fuels. The technique holds great promise for accurate quantitative measurement of the vapor phase but, due to its limited use, little knowledge is available on the accuracy of the technique in two-phase flows. In order to fully assess the accuracy and limitations of the infrared extinction technique in quantifying fuel vaporization, an experiment is proposed in which the techniques will be used in a very controlled simulated spray environment. The simulated spray consists of solid polystyrene spheres injected with a pure hydrocarbon gas, providing great flexibility in studying the effects of spray characteristics on the accuracy of the vapor measurements. Finally, improvements are proposed in the optical system geometry previously used for the infrared extinction technique, allowing more spatially precise measurements. Spatial precision is vital to the successful application of the infrared extinction technique to pulsed sprays and highly turbulent flows.

燃油喷雾汽化是液体燃料燃烧装置运行的关键环节。目前，由于测量蒸汽的测量技术的局限性，缺乏对蒸发喷雾进行气相分布定量测量的研究。基于碳氢化合物燃料对3.39波长入射辐射的强吸收，开发了一种非侵入式激光红外消光技术。该技术对气相的精确定量测量具有很大的希望，但由于其使用范围有限，对两相流中该技术的准确性知之甚少。为了充分评估红外消光技术在量化燃料汽化方面的准确性和局限性，提出了一项实验，该实验将红外消光技术用于非常受控的模拟喷雾环境。模拟喷雾由固体聚苯乙烯球注入纯烃气体组成，为研究喷雾特性对蒸汽测量精度的影响提供了很大的灵活性。最后，提出了以前用于红外消光技术的光学系统几何结构的改进，允许更精确的空间测量。空间精度是红外消光技术成功应用于脉冲喷雾和高湍流的关键。