Abstract
The burner system is a patented, unique, higher-efficiency and fuel-injector system that works with a specially designed oil burner to create ultra-efficient combustion that reduces oil use, greenhouse gases and other harmful emissions. This research shows the injector nozzle geometries play a significant role in spray characteristics, atomization and formation of fuel-air mixture in order to improve combustion performance, and decrease some pollutant products from burner system. The aim of this research is to determine the effects of nozzle hole shape on spray characteristics of the premix injector by using CFD. Multiphase of volume of fluid (VOF) cavitating flow inside nozzles are determined by means of steady simulations and Eulerian-Eulerian two-fluid approach is used for performing mixing of Jatropha oil and air. Nozzle flow simulations resulted that cavitation area is strongly dependent on the nozzle hole shape. Conical hole with k-factor of 2 provides higher flow velocity and turbulent kinetic energy compared with conical hole with k-factor of 1.3 and cylindrical hole. The results show that the premix injector nozzle hole shape gives impact to the spray characteristics and indirectly affects the emission of the system.
Highlights
Global warming is a famous issue and a major concern around the world
Implosions of cavitation bubbles inside the nozzle holes increase when the turbulence kinetic energy increases and contributes to the further break-up of the spray[8,9].the aim of this research is to use CFD simulation to determine the influence of orifice hole shape by analyzing the nozzle flow characteristics of the premix injector
It is reported that grid size has a significant effect on the convergence and predicted results [5, 6]
Summary
Global warming is a famous issue and a major concern around the world. The reduction of harmful gases and improvement of burner system need to be a growing priority. The burner system is a patented, unique, higher-efficiency and fuel-injector system creates the ultra-efficient combustion that reduces oil use, greenhouse gases and other harmful emissions. Premix injector nozzle geometries in the burner system play a significant role in flow characteristics, atomization and formation of fuel-air mixture in order to improve combustion performance, and reduce some pollutant products [3,4,5]. Han et al [3] found that the primary breakup region is relatively influenced by nozzle geometry when compared to the conical and cylindrical nozzles.In addition, velocity components act on the nozzle outlet plane are significant and appreciated since it contribute to the disintegration of the mixing fluids into droplets [7]. Conical nozzle with k-factor of 2 generates a sharp velocity graph to represent the highest velocity at nozzle outlet compared to another two nozzle holes
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