Abstract
An essential component of the injector nozzle geometry is to see the results spray atomization and mixture formation of the fuel-air combustion to improve performance, and reduce pollution from a burner. Studies involving the injectors in the combustion burner are still in a small proportion, particularly in the premix injector type. Thus, this study involves the efforts to determine the appropriate diameter of the premix injector where the injector spray characteristics is produced by using Computational Fluid Dynamics (CFD). Multiphase of the volume of fluid (VOF) cavitations flow in the nozzle is determined through steady simulation while Eulerian-Eulerian two-fluid approach is used for performing mixing of Jatropha oil and air. Further simulation is conducted using a spray with a discrete phase injection at the outflow hole injector nozzle. The investigation involves the modification of nozzle geometry on three different sizes of 0.8 mm, 1.0 mm and 1.5 mm with the analysis focused on nozzle flow characteristics of the injector. The results indicate that a small changes in injector gives high impact to the spray and combustion of a burner. This shows the importance of nozzle dimensions which influences the nozzle flow and affects the spray characteristics, hence influence the combustion and emission of the burner system.
Highlights
Burner is a heating device which is using an injectorto deliver fuel into the desired burning area
The present study aims to investigate the characteristics of the premixed injector using Computational Fluid Dynamics (CFD).The premixed injector with eight holes is used at three different nozzle diameters on the injection angle of 45° [5] which produces proper burning of the system
The study found that the diameter of the nozzle plays a very important role on the spray characteristics of premix injector
Summary
Burner is a heating device which is using an injectorto deliver fuel into the desired burning area. In this system, the fuel is atomized into a fine spray by using a pump forcing it through a nozzle of the injector. Premix injector is a type of indirect injection in which the fuel is injected into a subchamber to swirl the compressed air before deliver the spray into the area for combustion to occur. To encourage maximum combustion efficiency and minimize the emission of harmful gases, one injector should deliver fuel spray quickly spread and evaporate to produce a homogeneous mixture of fuel gas and air. Jet fuel spray or split in different regimes depending on the influence and interaction of the kinetic energy of the liquid, surface tension, viscosity, and the surrounding air [5]
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