Three-Dimensional Temporal Evolution of Primary Liquid Breakup in SPRAYs

该方案的目的是同时量化连续液核与周围气流之间的3D瞬时相互作用，该区域位于现代航空发动机中通常使用的模型喷雾器的主要破碎区域。喷油器在降低污染物水平以符合严格的排放标准方面起着至关重要的作用。然而，雾化过程涉及3D空间中空气和液体流动之间的随机动量耦合，这需要关于同时进行3D空气、液体流动的数据库，以了解潜在的物理和提供新的相关性，这是设计优化所需的指南。该项目将比以往任何时候都更好地了解喷嘴附近液体破碎过程的基本物理过程。这将通过开发一种新的激光诊断工具来实现，该工具可以同时对破碎过程中的空气和液体流动进行3D(体积)测量。新的激光诊断将结合：(A)液体破碎区域的全光成像，使用光学连接技术获得破碎过程中的瞬时3D连续液体结构，(B)多激光片式立体粒子图像测速仪测量破碎液体周围的3D空气流动。这是一种独一无二的能力，任何其他乐器都无法比拟。首先，该项目涉及生成独特的3D(体积)数据库，该数据库允许开发和验证计算模型，这些模型从未与3D(体积)测量进行比较。接下来，将首次通过法国ONERA公司提供的Mercato测试台在真实发动机运行条件下获取3D数据。后者对制造下一代净零碳航空发动机具有直接影响，减少了NOx和颗粒排放，以符合欧盟未来的ACARE目标(FlightPath 2050)。因此，该项目将加强欧盟在可持续、低排放机动性(EU Green Deal)方面的竞争力。

The purpose of the proposal is to quantify simultaneously the 3D instantaneous interaction between the continuous liquid core and the surrounding airflow at the primary breakup region of a model airblast atomizer, typically used in modern aeroengines. Fuel injector plays a vital role in cutting down pollutant levels to comply with stringent emission norms. However, the atomization process involves stochastic momentum coupling between air and liquid flows in 3D space that mandates database on simultaneous 3D air, liquid flow for the understanding of underlying physics and the delivery of novel correlations, guidelines required for design optimization. This project will understand better than anytime before the underlying physics of the liquid breakup process at the near nozzle region. This will be achieved by developing a novel laser diagnostic tool for simultaneous 3D (volumetric) measurements of the air and liquid flows during the breakup process. The novel laser diagnostic will combine: (a) plenoptic imaging of the liquid breakup region, using the optical connectivity technique to obtain instantaneous 3D continuous liquid structure during breakup, with (b) multi-laser sheet stereo Particle Image Velocimetry measurements of the 3D air flow around the breaking liquid. This is a unique capability not matched by any other instrument. First, the project involves generation of unique 3D (volumetric) database that allows the development and validation of computational models, which have never been compared to 3D (volumetric) measurements. Next, for the first time, 3D data will be acquired at realistic engine operating conditions through MERCATO test rig available at ONERA, France. The latter has a direct impact on building next-gen net-zero carbon aeroengines with reduced NOx and particulate emissions to comply with future EU ACARE goals (Flightpath 2050). Thus, the project will strengthen the EU's competitiveness in sustainable, low-emission mobility (EU Green Deal).