Original scientific paper
INFLUENCE OF INJECTOR ON CHARACTERISTICS OF FUEL DISPERSION IN DIESEL ENGINE
Ivan Filipović
; Faculty of Mechanical Engineering Sarajevo, Department for IC Engines and Vehicles
Boran Pikula
; Faculty of Mechanical Engineering Sarajevo, Department for IC Engines and Vehicles
Dževad Bibić
orcid.org/0000-0003-3762-9243
; Faculty of Mechanical Engineering Sarajevo, Department for IC Engines and Vehicles
Abstract
The combustion process in the IC engines predominantly depends on the air/fuel mixture preparation and conditions for its preparation. The process of air and fuel mixing can be analyzed through energy introduced with air and fuel in relation with necessary energy for rational formation of air/fuel mixture. The main role for the quality of the air/fuel mixture in diesel engines has energy introduced by the fuel, i.e. the characteristics of fuel injection process. These characteristics are mostly represented by: jet length, cone jet angle, physical and chemical structure of jet on different cross sections. The physical jet structure is generally described by average Sauter diameter of droplets. The approaches to calculate these parameters are as follows:
- modeling and calculating by a numerical method in order to solve 2D and 3D models, depending on the ambient conditions,
- using different semi-empirical models for calculatons of mentioned parameters.
Each approach the fuel jet characteristics calculations requires knowledge of so-called “boundary and initial” conditions, which are defined by the exit of fuel flow from nozzle orifice. In this paper using an example of jet fuel length it will be explained the current way of taking the boundary conditions at the nozzle, the role of injector itself in this specific case, as well as a new approach in defining the boundary conditions.
Keywords
diesel engine, fuel injection and dispersion; diesel engine fuel injection devices; theoretical model investigation viewpoint; real model investigation viewpoint; fluid flow through nozzles; mesh system of space coordinates
Hrčak ID:
72484
URI
Publication date:
3.10.2011.
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