PRIME: Unresolved fluid mechanics at liquid/gas interfaces for PRIMary brEakup of atomizing sprays

PRIME：雾化喷雾初次破裂的液体/气体界面处未解决的流体力学

• 批准号: EP/Y028848/1
• 负责人: Brian Peterson
• 金额: $ 215.83万
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FY028848%2F1
• 关键词: PRIME; Unresolved; fluid; mechanics; liquid

Efficient spray atomization plays a critical role within society, ranging from effective medical treatment to cleaner propulsion systems. Primary breakup - the process of disintegrating a liquid stream into large (primary) drops - is the consequential first step of atomization, but is also the least understood for atomizing sprays. This long-standing problem exists due to a lack of experimental tools that can measure the fundamental fluid dynamics that govern the primary breakup processes at liquid-gas interfaces (LGI) at the core of the spray. PRIME is uniquely designed to address this problem. We have developed a unique set of advanced diagnostic tools that provide the exclusive capability to measure fluid velocity and acceleration at LGIs of the liquid jet and primary drops. These tools are a unique combination of pulse-burst Ballistic Imaging combined with wavelet-based Optical Flow (wOF). In PRIME, we establish our proof-of-concept tools, and develop wOF for original applications with two-photon laser induced fluorescence, to provide ground-breaking measurements that help resolve unanswered questions of primary breakup. Two spray facilities will be developed in PRIME, which provide a unique platform to apply our diagnostics for new fundamental knowledge for a range of sprays from basic to technically-relevant complex sprays. These facilities will include custom-built transparent nozzles to perform imaging measurements inside the spray nozzle. Advanced diagnostics will be combined with a suite of established imaging diagnostics (shadowgraphy, schlieren, micro-PIV) to correlate the primary breakup flow dynamics with its corresponding breakup genesis occurring inside the spray nozzle. PRIME will provide substantial breakthroughs in knowledge, and will generate a comprehensive spray database designed for the development and validation of computational models for the wider spray community. As such, PRIME is intended for long term success.

高效喷雾雾化在社会中发挥着至关重要的作用，从有效的医疗到更清洁的推进系统。初级破碎——将液流分解成大的（初级）液滴的过程——是雾化的第一步，但对于雾化喷雾来说也是最不了解的。这个长期存在的问题之所以存在，是因为缺乏能够测量基本流体动力学的实验工具，而这些基本流体动力学控制着喷雾核心液-气界面 (LGI) 的初级分解过程。 PRIME 的独特设计就是为了解决这个问题。我们开发了一套独特的先进诊断工具，提供测量液体射流和初级液滴 LGI 处的流体速度和加速度的独特功能。这些工具是脉冲爆发弹道成像与基于小波的光流 (wOF) 的独特组合。在 PRIME 中，我们建立了概念验证工具，并为双光子激光诱导荧光的原始应用开发了 wOF，以提供突破性的测量，帮助解决尚未解答的初级破碎问题。 PRIME 将开发两个喷雾设施，这提供了一个独特的平台，可以应用我们的诊断来获得从基本喷雾到技术相关的复杂喷雾等一系列喷雾的新基础知识。这些设施将包括定制的透明喷嘴，用于在喷嘴内进行成像测量。先进的诊断将与一套已建立的成像诊断（阴影摄影、纹影、微型 PIV）相结合，将初级破碎流动力学与其发生在喷嘴内部的相应破碎起源相关联。 PRIME 将提供知识方面的重大突破，并将生成一个综合喷雾数据库，旨在为更广泛的喷雾社区开发和验证计算模型。因此，PRIME 旨在实现长期成功。