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

提案编号：cbet -0645063首席研究员：Marshall， Andre w .联系：马里兰大学学院公园一个多世纪以来，由于在自然界中出现了许多令人着迷的液体破碎现象，以及无数需要喷雾来分散液体的工业应用，包括喷油器和灭火剂的输送，雾化研究受到了人们的关注。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条件下被放大时，就会发生初级雾化，导致射流体破碎成液滴。如果初始液滴超过临界尺寸，就会发生二次雾化，并导致液滴继续解体，直到达到足够小的尺寸。破碎行为、相关的空气动力学和初始液滴的位置对于决定最终喷雾的分散和解体特性至关重要；然而，由于对该地区密集喷雾的诊断困难，液滴形成的定量数据有限。本研究的重点是在初级雾化阶段的雾化和喷雾科学，在初级雾化阶段，液体射流首先分解成液滴。将通过多种激光诊断技术和建模来研究破裂，然后将其与商用液体注入器的数据进行比较。这是一个具有挑战性和广泛重要性的问题，伴随着一定程度的风险，但直接涉及确定液滴大小分布及其来源的关键问题。此外，该研究将通过提供基本见解和用于测试的综合数据库，帮助科学和设计模型的成功开发。广泛影响：CAREER补助金的一个关键方面是通过其教育计划创造实质性的社会影响。获奖者提出的中学“星期六科学实验室”有可能在学生对使用科学的可能性和现实持开放态度的关键时刻抓住他们的兴趣。马里兰大学学院公园地理位置优越，可以接触到大量不同的学生和教师。通过特别向代表性不足的少数民族伸出援助之手，获奖者打算提高他们成为科学家和工程师的潜力。

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.