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Review article

https://doi.org/10.18048/2019.57.02.

Numerical Analysis of Fuel Injector Nozzle Geometry - Influence on Liquid Fuel Contraction Coefficient and Reynolds Number

Lino Kocijel orcid id orcid.org/0000-0002-8460-4404 ; Faculty of Engineering, University of Rijeka
Vedran Mrzljak orcid id orcid.org/0000-0003-0323-2600 ; Faculty of Engineering, University of Rijeka
Maida Čohodar Husić ; Faculty of Mechanical Engineering, University of Sarajevo
Ahmet Čekić ; Faculty of Mechanical Engineering, University of Sarajevo


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Abstract

This paper investigates the influence of the fuel injector nozzle geometry on the liquid fuel contraction coefficient and Reynolds number. The main three fuel injector nozzle geometry parameters: nozzle diameter (d), nozzle length (l) and nozzle inlet radius (r) have a strong influence on the liquid fuel contraction coefficient and Reynolds number. The variation of the nozzle geometry variables at different liquid fuel pressures, temperatures and injection rates was analyzed. The liquid fuel contraction coefficient and Reynolds number increase with an increase in the nozzle diameter, regardless of the fuel injection rate. An increase in the r/d ratio causes an increase in the fuel contraction coefficient, but the increase is not significant after r/d = 0.1. A nozzle length increase causes a decrease in the fuel contraction coefficient. Increase in the nozzle length of 0.5 mm causes an approximately similar decrease in the contraction coefficient at any fuel pressure and any nozzle length. Fuel injectors should operate with minimal possible nozzle lengths in order to obtain higher fuel contraction coefficients.

Keywords

fuel injector, nozzle geometry, fuel contraction coefficient, Reynolds number

Hrčak ID:

232662

URI

https://hrcak.srce.hr/232662

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