Abstract
Mixture formation of the ignition process is a crucial part in diesel combustion as it affects the combustion process and exhaust emission. The main focus of this study is to investigate the effects of spray characteristic to the fuel spray in a chamber using Computational Fluid Dynamics (CFD) simulation. However, simulations are done with the discrete phase of injection taken from the outlet of the nozzle hole to spray chamber. The details behavior of spray penetration and spray breakup length were visualized using Computational Fluid Dynamics. This simulation was done in different nozzle diameters 0.12 mm and 0.2 mm performed at a single ambient pressure of 4 MPa, the ambient temperature of 500 K and 700 K with different injection pressure 40 MPa, 70 MPa and 140 MPa. Results showed that the droplet diameter is influenced by high pressure to become smaller, and the penetration length also longer with high injection pressure applied. Besides, smaller orifice diameter gives a shorter length of the breakup. It is necessary to put afford on orifice diameter and ambient temperature conditions in order to improve the formation of spray.
Highlights
Internal combustion engine is the heat engines that convert properties of fuel into a mechanical system, and this application is on the rotating output shaft
This study found that the injection pressure and ambient temperature used influenced the formation of a spray in the chamber
Ambient temperatures 500 K and 700 K are used in this study, while the ambient pressure applied in the chamber is 4 MPa
Summary
Internal combustion engine is the heat engines that convert properties of fuel into a mechanical system, and this application is on the rotating output shaft. Design of the orifice for fuel injector is important on the performance and emission of diesel engine. Fuel spray that encounters the necessary objectives of performance and emissions into the market for which the engine delivered regardless details of the fuel system design This simulation study used computational fluid dynamics (CFD); ANSYS version 16.1 Fluent software to study the spray characteristics. Investigations into Diesel spray characteristics had concentrated on the effect of spray characteristic on engine performance such as the spray tip penetration, break-up length and droplet size and velocity distributions [3]. The spray tip penetration gets longer as the injection pressure increases This result is related to both higher quantity and higher velocity of the droplets at higher injection pressures [6]. This study conducted by using Computational Fluid Dynamic simulation which can captured the spray penetration and breakup length
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