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Simulation of different orifice geometries on premix injector

Yii, Ronny Shi Chin (2016) Simulation of different orifice geometries on premix injector. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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The search for higher energy efficiency of industrial scale burners to obtain low emission especially Nitrogen Oxides (NOx) and Particulate Matter (PM) has demanded experimental studies that are complemented with Computational Fluid Dynamics (CFD) simulations. Active and passive emission control methods are common techniques in controlling emission. However, the aim of this research is focused on the passive control techniques with a specifically modification on burner orifice’s geometry and different fuel properties are used to study the prediction of combustion modeling. Prediction is based on the nozzle orifice flow behaviour and spray characteristics as well as fuel-air mixture formation in mixing chamber through ANSYS FLUENT simulation. Multiphase of Volume of Fluid (VOF) and turbulence model of Transition Shear Stress Transport (SST) are used throughout whole simulation analysis. Other than that, Eulerian-Lagragian multiphase approach is used for the steady simulations and spray generation. Furthermore, experimental spray droplets sizes at selected locations from nozzle outlet are taken by direct photography method and validated with the simulated droplets size. The rapid mixing region is predicted at the area near to fuel and air inlet. Besides, the cavitation, spray dispersion and Sauter Mean Diameter (SMD) are predicted increased when L/D dropped from 2.5 to 1.667. Furthermore, cavitation is predicted reduced but spray dispersion and SMD increased when orifice coefficient increased from K = 0 to K = 20. Meanwhile, high viscosity and density of Crude palm oil (CPO) biodiesel blends is believed to cause high cavitation inside orifice, wider spray dispersion and high SMD.

Item Type: Thesis (Masters)
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ751-805 Miscellaneous motors and engines
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 02 Feb 2017 03:47
Last Modified: 02 Feb 2017 03:47
URI: http://eprints.uthm.edu.my/id/eprint/8831
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