Simultaneous LIF and BOS investigation of an impact of a gaseous jet on an oil film under engine relevant conditions

Abstract

Internal combustion engines are a significant contributor to global CO₂ emissions. Sustainable fuels are seen as having great potential to significantly reduce these emissions. Hydrogen has the potential to significantly reduce local emissions. It can also be injected directly into the combustion chamber, where the resulting jet interacts with the cylinder wall and can influence the engine process. To be able to quantify this influence, fuel impingement has been investigated in this work. As fluids with different states of aggregation interact with each other in this process, a special measurement technique has to be applied. The gaseous fuel is visualised using a background oriented schlieren technique. The liquid phase of the oil is visualised using laser induced fluorescence. Using this technique, it was observed that the impact of a gaseous jet can deform a thin oil film and that isolated detachment effects can be observed.