Study of the effect of nozzle hole shape on internal flow and spray characteristics

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.

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Effects of the Internal Flow in a Nozzle Hole on the Breakup Processes of a Liquid Jet

International Journal of Fluid Mechanics Research ◽

10.1615/interjfluidmechres.v24.i4-6.20 ◽

1997 ◽

Vol 24 (4-6) ◽

pp. 461-470 ◽

Cited By ~ 2

Author(s):

N. Tamaki ◽

Keiya Nishida ◽

Hiroyuki Hiroyasu ◽

M. Shimizu

Keyword(s):

Internal Flow ◽

Liquid Jet ◽

Nozzle Hole

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EXPERIMENTAL AND NUMERICAL STUDY OF INTERNAL FLOW AND SPRAY CHARACTERISTICS FOR ELLIPTICAL ORIFICE UNDER TYPICAL DIESEL ENGINE OPERATION CONDITIONS

Atomization and Sprays ◽

10.1615/atomizspr.2018025820 ◽

2018 ◽

Vol 28 (8) ◽

pp. 713-733

Author(s):

Shenghao Yu ◽

Bifeng Yin ◽

Weixin Deng ◽

Hekun Jia ◽

Ze Ye ◽

...

Keyword(s):

Diesel Engine ◽

Numerical Study ◽

Internal Flow ◽

Spray Characteristics ◽

Engine Operation ◽

Operation Conditions

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Study on Influence of Nozzle Structure on Flow in Diesel Nozzle Orifice

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.246-247.127 ◽

2012 ◽

Vol 246-247 ◽

pp. 127-130

Author(s):

Bing Li ◽

Xue Song Hu ◽

Xiao Feng Cao ◽

Gui Qi Jia ◽

Fang Xi Xie ◽

...

Keyword(s):

Flow Characteristics ◽

Internal Flow ◽

Key Factors ◽

Complex Flow ◽

Two Phase ◽

Nozzle Orifice ◽

Fuel Flow ◽

Flow Features ◽

Diesel Nozzle ◽

Nozzle Hole

The fuel flow characteristics in diesel nozzle orifice are key factors to the atomization of fuel near the nozzle orifice. In the paper, two-phase flow model is used to simulate the complex flow features in nozzle orifice, and to study the influences of the relative position of nozzles orifice axis and nozzle axis, and inclination angle of nozzle hole on the internal flow feature.

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