Fuel Injection System Simulation with Renewable Diesel Fuels

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2009-24-0105 Fuel Injection System Simulation with Renewable Diesel Fuels Aki Tilli, Ossi Kaario, Matteo Imperato and Martti Larmi TKK, Helsinki University of Technology

Copyright © 2009 SAE International

ABSTRACT Renewable diesel-type fuels and their compatibility with a single-cylinder medium-speed research diesel engine were studied. The report consists of a literature study on the fuels, introduction of the simulation model designed and simulations made, and of the results and summary sections. The fuels studied were traditional biodiesel (fatty acid methyl ester, FAME), hydrotreated vegetable oil (HVO), Fischer-Tropsch (FT) diesel fuels and dimethyl ether (DME).

According to the simulations, the behaviors of different renewable diesel fuels in the fuel injection system are quite similar to one another, with the greatest deviations found with DME. The main differences in the physical properties are fuel densities and viscosities and especially with DME compressibility, which have some predictable effect. The chemical properties of the fuels are more critical for a common rail fuel injection system.

INTRODUCTION The awareness of the climate change has become widespread and the fossil fuel production decline is inevitable. Thus the focus of internal combustion engine research is increasingly on more or less CO2 -neutral

renewable fuels, whose emissions are promisingly low according to previous studies. [1, 2, 3, 4, 5, 6, 7, 8]

The focus of this research was to evaluate the compatibility of modern renewable diesel fuels with the fuel injection system of the “Extreme Value Engine” (EVE), a single-cylinder medium-speed research engine of the Internal Combustion Engine Research Group of Helsinki University of Technology. The study serves as a preliminary research for future research and development of the engine. Previously, there have been

many studies on biofuel impact on fuel sprays and emissions [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], but less on their behavior in the fuel injection system. [6, 7, 11, 12, 13, 14, 15]

The fuels estimated most suitable and included in the research were traditional biodiesel (fatty acid methyl ester, FAME), hydrotreated vegetable oil (HVO), Fischer-Tropsch (FT) diesel fuels and dimethyl ether (DME). The raw materials, production and characteristics of the fuel types are briefly introduced and their qualities and usability compared. The objective of the study was to compare the fuels and determine whether renewable fuel properties require changes in the fuel injection system of EVE research engine.

EVE RESEARCH ENGINE EVE is a single-cylinder medium-speed 4-stroke diesel engine with a 200 mm bore. The current maximum cylinder pressure of EVE is about 200 bars, rail pressure 1400 bars and engine speed 900 rpm. EVE has a charge air compressor (1-8 bars) and floating engine bed on air springs. Special characteristics include electro-hydraulic control of gas exchange valves, electro-hydraulically (solenoid) controlled injection valve, operation in motored mode, easy access for measurements and optical access. The fuel injection system of EVE is based on Wärtsilä W32 common rail accumulator and W20 injector. EVE is a very flexible and accessible test bed for research purposes with powerful and versatile control of engine parameters. [16, 17]

THE FUELS STUDIED Renewable diesels have both advantages and disadvantages when compared with regular diesel. A comparison of renewable diesel raw materials,

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