PECASE: Exploring Jet Fragmentation and Atomization for Combustion and Fire Suppression Systems

PECASE：探索燃烧和灭火系统的射流破碎和雾化

• 批准号: 0645063
• 负责人: Andre Marshall
• 金额: $ 40万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0645063&HistoricalAwards=false
• 关键词: PECASE; Exploring; Jet; Fragmentation; Atomization

Proposal Number: CBET-0645063Principal Investigator: Marshall, Andre W.Affiliation: University of Maryland, College ParkProposal Title: CAREER: Exploring Jet Fragmentation and Atomization for Combustion and Fire Suppression SystemsAtomization research has received attention for over a century owing to many fascinating occurrences of liquid fragmentation phenomena in nature and to countless industrial applications requiring sprays for liquid dispersion, including fuel injectors and fire-suppressant delivery. The liquid-jet atomization process takes place in two major steps. Primary atomization occurs when oscillations in the jet are amplified under favorable conditions, causing the body of the jet to break up into drops. Secondary atomization occurs if the initial drops exceed a critical size, and it results in continued disintegration of drops until a sufficiently small size is reached. The break-up behavior, associated aerodynamics, and location of the initial drops is critical in determining the dispersion and disintegration characteristics of the resulting spray; however, limited quantitative droplet formation data is available because of diagnostic difficulties with interrogating the dense spray in this region.This research focuses on the science of atomization and sprays at the stage of primary atomization where a liquid jet first breaks into drops. The breakup will be studied by multiple laser diagnostic techniques and by modeling, which in turn will be compared to data from commercial liquid injectors. This is a challenging and widely important problem, accompanied by a measure of risk but going directly to the key issue of determining droplet size distribution and its source. Furthermore, the research will aid successful development of scientific and design models by providing both fundamental insights and a comprehensive database for testing.Broad Impacts: A key aspect of the CAREER grant is to create substantial societal impact through its education plan. The awardee's proposed middle-school "Saturday Science Laboratory" has the potential to capture the interest of students at a key moment when they are open to the possibility and reality of using science. The University of Maryland College Park is well situated to reach a large and diverse population of students and their instructors as well. By particular outreach to underrepresented minorities, the award recipient intends to increase their potential for becoming scientists and engineers.

提案编号：CBET-0645063PRINCIPAL研究者：马歇尔，安德烈·W。处理：马里兰州大学，大学公园帕克萨普拉邦大学职业：职业：燃烧和燃料的燃料和火灾抑制系统的研究已在一个世纪以多个世纪的关注而引起了许多迷人的速度范围的燃料，并在燃料中引起了人们的关注，包括流动性脆弱的速度，以及速度的燃油率，并遍布液体碎片，并遍布液体脆弱性的生命。喷油器和施加抑制剂输送。液体喷射雾化过程分为两个主要步骤。当射流中的振荡在有利的条件下放大时，就会发生主要雾化，从而导致射流物体分解为滴。如果初始下降超过临界大小，则会发生次要雾化，并且会导致滴落的持续分解直到达到足够小的尺寸。分解行为，相关的空气动力学和初始滴的位置对于确定所得喷雾剂的分散和分解特征至关重要。但是，由于诊断困难而在该地区的质疑中遇到诊断困难，因此可以使用有限的定量液滴形成数据。这项研究的重点是雾化科学和在原雾化阶段的雾化科学，液态喷气机首先脱落。 分手将通过多种激光诊断技术和建模研究，这又将与商业液体喷油器的数据进行比较。这是一个具有挑战性且普遍重要的问题，伴随着一定的风险，但直接进入了确定液滴尺寸分布及其来源的关键问题。 此外，这项研究将通过提供基本见解和测试的全面数据库来帮助成功开发科学和设计模型。BROAD的影响：职业赠款的一个关键方面是通过其教育计划创造重大的社会影响。 获奖者提议的中学“星期六科学实验室”有可能在学生开放使用科学的可能性和现实的关键时刻吸引学生的兴趣。 马里兰州大学公园的位置良好，可以吸引大量的学生及其教练。 特别是与代表性不足的少数民族的宣传，该奖项获得者打算提高其成为科学家和工程师的潜力。