Investigation of Non-Spherical Droplets in High-Pressure Fuel Sprays

高压燃油喷雾中非球形液滴的研究

• 批准号: EP/K020528/1
• 负责人: Cyril Crua
• 金额: $ 77.35万
• 依托单位: University of Brighton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2013
• 资助国家: 英国
• 起止时间: 2013 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FK020528%2F1
• 关键词: Investigation; Non; Spherical; Droplets; Pressure

Understanding the mechanisms that lead to the breakup and evaporation of liquids is a key step towards the design of efficient and clean combustion systems. The complexity of the processes involved in the atomisation of Diesel fuels is such that many facets involved are still not understood.The morphological composition of a typical Diesel spray includes structures such as ligaments, amorphous and spherical droplets, but the quantity of fuel occupied by perfectly spherical droplets can represent a small proportion of the total injected volume. These relatively large non-spherical structures have never been thoroughly investigated and documented in high-pressure sprays, even though the increase in heat transfer surface area of deformed droplets is an influential factor for predicting the correct trend of evaporating Diesel sprays. The characterisation of fuel spray droplets is generally conducted using laser diagnostics that can measure droplet diameters with a high level of accuracy, but they are fundamentally unable to measure the size or shape of non-spherical droplets and ligaments. Hence the data obtained through these diagnostic techniques provide a partial and biased characterisation of the spray. The experimental bias towards spherical droplets is compounded by the complexity of modelling the heating and evaporation of deformed droplets. Consequently, theoretical models for liquid fuel atomisation and vaporisation are based on a number of simplifying hypotheses including the assumption of dispersed spherical droplets.Our proposal seeks to initiate a step change in the description of petroleum and bio fuel spray formation by developing diagnostics and numerical models specifically focused on non-spherical droplets and ligaments. Our approach will build upon recent advances with microscopic imaging to build novel diagnostics and algorithms that can measure the shape, size, velocity and gaseous surrounding of individual droplets and ligaments. This morphological classification, along with the velocity measurements, will be used to develop new phenomenological and numerical models for spray breakup, heating and evaporation. The models will then be implemented into computational fluid dynamics (CFD) codes to simulate spray mixing under modern engine conditions, and generate information where optical diagnostics cannot be applied. These goals will be achieved by combining the expertise of the academic and industrial partners with that of international experts from the University of Bergamo, CORIA, and Moscow State University.The project's concerted approach, aimed at removing the experimental and numerical biases towards spherical droplets, will establish a unique world leading research capability with potential impact for numerous practical spray applications. The project would underpin research in areas that rely upon the atomisation or evaporation of liquids, including the efficient delivery of liquid fuel, pharmaceutical drugs, cryogens, lubricants and selective catalytic reductants.

了解导致液体分解和蒸发的机制是设计高效清洁燃烧系统的关键一步。柴油机燃油雾化过程的复杂性使得许多方面还不清楚。典型柴油机喷雾的形态组成包括韧带、无定形和球形液滴等结构，但完美球形液滴所占燃油量仅占总喷射量的一小部分。这些相对较大的非球形结构从来没有被彻底研究和记录在高压喷雾，即使变形液滴的传热表面积的增加是一个有影响力的因素，用于预测正确的蒸发柴油喷雾的趋势。燃料喷雾液滴的表征通常使用激光诊断来进行，该激光诊断可以以高精度水平测量液滴直径，但是它们基本上不能测量非球形液滴和韧带的尺寸或形状。因此，通过这些诊断技术获得的数据提供了喷雾的部分和有偏差的表征。对球形液滴的实验偏差是由复杂的建模变形液滴的加热和蒸发。因此，液体燃料雾化和蒸发的理论模型是基于一些简化的假设，包括分散的球形droplets. We的建议的假设，旨在启动一个步骤的变化，在描述石油和生物燃料喷雾形成的诊断和数值模型，特别是专注于非球形液滴和韧带。我们的方法将建立在显微成像的最新进展的基础上，以建立新的诊断和算法，可以测量单个液滴和韧带的形状，大小，速度和气体环境。这种形态分类，沿着与速度测量，将用于开发新的现象学和数值模型喷雾破碎，加热和蒸发。然后，这些模型将被实施到计算流体动力学（CFD）代码中，以模拟现代发动机条件下的喷雾混合，并生成无法应用光学诊断的信息。这些目标将通过学术界和工业界合作伙伴的专业知识与来自贝加莫大学、CORIA和莫斯科州立大学的国际专家的专业知识相结合来实现。该项目的协调方法旨在消除对球形液滴的实验和数值偏差，将建立一个独特的世界领先的研究能力，对许多实际喷雾应用产生潜在影响。该项目将支持依赖液体雾化或蒸发的领域的研究，包括液体燃料、药物、冷冻剂、润滑剂和选择性催化还原剂的有效输送。

项目成果

Transition from droplet evaporation to miscible mixing at diesel engine conditions

在柴油发动机条件下从液滴蒸发过渡到混相混合

• 发表时间: 2015
• 作者: Crua C

Modelling of biodiesel fuel droplet heating and evaporation: Effects of fuel composition

• DOI: 10.1016/j.fuel.2015.03.051
• 发表时间: 2015-08
• 期刊: Fuel
• 影响因子: 7.4
• 作者: Mansour Al Qubeissi;S. Sazhin;C. Crua;J. Turner;M. Heikal

Modelling of gasoline fuel droplets heating and evaporation

• DOI: 10.1016/j.fuel.2015.06.028
• 发表时间: 2015-11
• 期刊: Fuel
• 影响因子: 7.4
• 作者: Mansour Al Qubeissi;S. Sazhin;J. Turner;S. Begg;C. Crua;M. Heikal

Temperature measurements under diesel engine conditions using laser induced grating spectroscopy

• DOI: 10.1016/j.combustflame.2018.10.017
• 发表时间: 2019-01-01
• 期刊: COMBUSTION AND FLAME
• 影响因子: 4.4
• 作者: Forster, F.;Crua, C.;Ewart, P.
• 通讯作者: Ewart, P.

Simulation and Measurement of Transient Fluid Phenomena within Diesel Injection

• DOI: 10.4271/2019-01-0066
• 发表时间: 2019-01
• 期刊: SAE International Journal of Advances and Current Practices in Mobility
• 作者: M. Gold;R. Pearson;J. Turner;Daniel Sykes;V. Stetsyuk;G. de Sercey;C. Crua;Mithun Murali-Girija-Mithun-Murali-Giri