Effects of Hole Diameter and Injection Pressure on Fuel Spray and Its Evaporation Characteristics of Multi-Hole Nozzle for Diesel Engine
The performance of a diesel engine largely depends on the spray behavior and mixture formation. Nozzle configurations and operating conditions are important factors that influence spray development. Using numerical and experimental methods, this study focused on the spray development of multi-hole nozzles under non-evaporating and evaporating conditions to compare the influence of nozzle hole diameter and injection pressure on spray characteristics. High-speed video observation was employed to study the properties of spray development under the non-evaporating condition, while the Laser Absorption Scattering technique was used in the observation and quantitative analysis of evaporating spray characteristics in the evaporating condition. In addition, computational fluid dynamics study results published previously  were correlated with the current experimental results to provide more detailed explanations about the mechanism of the characteristics of spray behavior.