Experimental and numerical analysis of spray-film-interaction for thin wall-films

高密度喷雾与薄壁薄膜的相互作用对内燃机的应用具有重要的技术意义。科学文献提供了大量关于单液滴/壁-膜-相互作用的研究，这些研究导致了描述相互作用过程结果的各种模型的发展。自己对喷雾/壁膜相互作用的研究表明，对于高密度喷雾，单个液滴的影响并不重要。相反，液滴聚集(包括液滴碰撞和多个液滴同时撞击)和射流冲击(包括射流偏转和壁面剪应力)主导着液体的沉积和清除。在给定的方案中，将通过实验和数值方法，应用最先进的数值喷雾模型、通用的实验装置和基于激光的光学测量技术来量化聚集和剪切应力的影响。

The interaction of high-density sprays with thin wall-films is of technical relevance for IC engine applications. Scientific literature offers a large number of investigations on single-droplet/wall-film-interaction, which have led to the development of various models describing the outcome of the interaction process. Own studies on spray/wallfilm-interaction suggest that for high-density sprays single-droplet-effects are of minor importance. Instead, droplet swarming (including droplet collisions and simultaneous impact of a multitude of droplets) and jet impingement (including jet deflection and wall-shear-stresses) dominate liquid deposition and removal. In the given proposal, the influence of swarming and shear stress will be quantified by experimental and numerical methods, applying a state-of-the-art numerical spray model, a generic experimental setup, and laser-based optical measurement techniques.