Investigation of Effects Ofinlet Boundary Conditions on the Flow Behaviour in a Diesel Injector

Abstract:

Diesel engines become popular from this point of view because of their high thermal efficiency. However, new and developing technologies are expected to lower their emission levels. Atomization of the fuel has a vital importance in order to control heat release rate and exhaust emission during combustion. With the known injection devices, atomization of the fuel is realized with high pressure systems such as common rail direct injectors (CRD) which operate at pressures exceeding 1300 bar. However, atomization of the fuel by simply increasing injection pressure can create cavitation erosion which may lead to mechanical failure of the nozzle. Utilization of air in diesel engine injectors will increase fuel atomization, provides more complete combustion of any diesel fuel consumed, enhance fuel economy and results in lower engine emissions. Therefore the aim of this study is to design a special injection device for use in a diesel engine which improves combustion by mixing air and fuel inside itself at optimum ratio. Proper air inlet pressure was determined for favorable diesel air mixing by investigation of the flow behavior in a newly designed injection device with the help of computational fluid dynamics based software. Three different air inlet pressures (20, 30 and 40 bar) are simulated and the contours of turbulence intensity, velocity and volume fraction of diesel fuel are discussed, and compared with each other.

• Periodical: Advanced Materials Research (Volume 1016)
• Pages: 602-606
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1016.602
• Online since: August 2014
• Authors: Gökhan Tuccar*, Tayfun Ozgur, Erdi Tosun, Ceyla Ozgur, Kadi̇r Aydin
• Keywords: Computational Fluid Dynamics (CFD), Emission, Injection System, Internal Combustion Engines

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