CAREER: Disruption and Vaporization of Superheated Droplets in Compressible Flow

职业：可压缩流中过热液滴的破裂和蒸发

• 批准号: 9733830
• 负责人: James Hermanson
• 金额: $ 23.5万
• 依托单位: Worcester Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-01 至 2002-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9733830&HistoricalAwards=false
• 关键词: CAREER; Disruption; Vaporization; Superheated; Droplets

Abstract - CTS-9733830 Hermanson, James C. The breakup and vaporization of liquid droplets in a high-speed gas stream occurs in two-phase flows, spray drying, rocket nozzle flow, liquid fuel injection, and steam turbine blade erosion. Considerable practical advantages in many applications could be realized if high levels of dispersion and rapid mixing were achieved. One technique is that of flash vaporization which involves violent disruption and vaporization of superheated liquids. Most of the extant literature is focussed on incompressible flows and is not applicable to compressible flows, which are found in supersonic combustors. The physics of superheated liquid droplet disruption, vaporization, and fuel/air mixing are not well established. The proposed research program is a comprehensive, experimental investigation of the fundamental physics of superheated liquid fuel disruption and vaporization in supersonic flow, where the entire volume of the droplet is brought to a high level of superheat to promote flash vaporization. This work will be a first step towards achieving a fundamental understanding of the behavior of superheated liquid fuel sprays in compressible flow, with particular attention paid t the different instability mechanism which affect the droplet history. Droplets will be injected into a supersonic stream and their acceleration and subsequent vaporization will be examined primarily by planar laser-induced fluorescence and laser-spark schlieren/shadowgraphs.

摘要-CTS-9733830 Hermanson，JamesC。高速气流中液滴的分解和汽化发生在两相流中，喷雾干燥，火箭喷嘴流量，液体燃料注入和蒸汽轮机刀片侵蚀。 如果实现高水平的分散和快速混合，则可以实现许多应用的实践优势。 一种技术是闪光蒸发，涉及过热液体的剧烈破坏和蒸发。 大多数现存的文献都集中在不可压缩的流量上，并且不适用于可压缩流，这些流程在超音速燃烧器中发现。 过热的液滴破坏，汽化和燃料/空气混合的物理学尚未得到很好的确定。 拟议的研究计划是对超热燃料中断和超音速流动中过热液体燃料中断和蒸发的基本物理学的全面，实验研究，在该物理学中，液滴的全部体积都高于高水平的过热，以促进闪光蒸发。 这项工作将是实现对可压缩流中过热液体燃料的行为的基本理解的第一步，特别注意影响液滴历史的不同不稳定性机制。 液滴将被注入超音速流，其加速度和随后的汽化将主要通过平面激光诱导的荧光和激光螺旋体Schlieren/Shadowgraphs检查。