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

高密度喷雾与薄壁膜的相互作用对内燃机应用具有技术意义。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，单液滴效应的重要性较小。相反，液滴群（包括液滴碰撞和大量液滴同时撞击）和射流撞击（包括射流偏转和壁面剪切应力）主导了液体的沉积和去除。在给定的建议中，蜂群和剪应力的影响将通过实验和数值方法进行量化，应用最先进的数值喷雾模型，通用实验设置和基于激光的光学测量技术。

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.