Macroscopic spray characterization under high ambient density conditions

The combustion process in the diesel engine is significantly affected by the fuel spray characteristics and fuel-air mixing process. Therefore, spray development process plays a vital role in combustion and emission formations which makes the study on spray characteristics: an essential entity to better understand the combustion process in detail. Thus this study is focused on non-evaporative spray characterization in a constant volume chamber, specially built to simulate the engine combustion chamber condition during injection process. Then the experimental results were compared with numerical results obtained from internal nozzle flow and spray simulations and found better agreement with each other. The results were obtained in terms of momentum flux, spray tip penetration, spray angle and spray volume. From the results, it can be inferred that the momentum flux, spray tip penetration and fuel air mixing increases with increasing injection pressure or decreasing ambient density. However, momentum coefficient and spray angle remains unchanged with injection pressure variations. The liquid length increases and sauter mean diameter decreases with increasing pressure difference at higher temperature ensuring better atomization of fuel.