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1

Modeling of thermal cycle ci engine with multi-stage fuel injection

Jamrozik A., Tutak W., Gnatowski A., Gnatowska R., Winczek J., Sosnowski M.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 3

179--186

EN

This work presents a complete thermal cycle modeling of a four-stroke diesel engine with a three-dimensional simulation program CFD - AVL Fire. The object of the simulation was the S320 Andoria engine. The purpose of the study was to determine the effect of fuel dose distribution on selected parameters of the combustion process. As a result of the modeling, time spatial pressure distributions, rate of pressure increase, heat release rate and NO and soot emission were obtained for 3 injection strategies: no division, one pilot dose and one main dose and two pilot doses and one main dose. It has been found that the use of pilot doses on the one hand reduces engine hardness and lowers NO emissions and on the other hand, increases soot emissions.

2

Charakterystyki wydzielania ciepła w silniku MultiJet o zapłonie samoczynnym z jedno-, dwu- i trzyfazowym wtryskiem paliwa

Ambrozik A., Ambrozik T., Kurczyński D., Łagowski P.

Autobusy : technika, eksploatacja, systemy transportowe

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2012

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R. 13, nr 7-8

68-75

PL

Celem artykułu jest analiza i ocena wpływu jedno-, dwu- i trzyetapowego wtrysku paliwa na charakterystyki wydzielania ciepła podczas procesu spalania w silniku 1.3 Multijet zasilanym olejem napędowym. Analizie poddano rzeczywiste wykresy indykatorowe sporządzone przy pracy silnika wg zewnętrznej charakterystyki prędkościowej w zakresie prędkości obrotowej wału korbowego silnika od 1000 do 4600 obr/min. Charakterystyki wydzielania ciepła sporządzono wykorzystując do tego program INDY-2 opracowany w Zakładzie Silników Cieplnych Katedry Mechaniki. Program INDY-2 umożliwia wyznaczanie charakterystyk wydzielania ciepła przy założeniu, że proces spalania zakończył się do otwarcia zaworu wylotowego oraz, że całkowita wartość względnej ilości wydzielonego ciepła podczas całkowitego i zupełnego procesu spalenia jest równa x = xi + xstr = 1. Obliczenia realizowano od otwarcia zaworu wylotowego w kierunku początku procesu spalania. Obliczenia wykonane wg powyższego programu uwzględniają zmianę ilości produktów spalania w czasie jego trwania, zmianę ciepeł właściwych zależnych od składu i temperatury czynnika roboczego oraz straty ciepła powodowane wymianą ciepła pomiędzy czynnikiem roboczym a ściankami przestrzeni w której zachodzi proces spalania jak też inne jego straty powodowane np. dysocjacją, niezupełnością i niecałkowitością spalania itp.

EN

The paper aims at analysing and assessing the impact of multistage fuel injection on heat release analysis of the combustion process in the 1.3 Multijet engine fuelled with diesel oil. The analysis was performed on real indicator diagrams taken for the engine working at the external speed characteristics at the crankshaft rotational speed ranging from 1000 to 4600 rpm. Heat release analysis was carried out with the INDY-2 software designed at the Division of Heat Engines of the Mechanics Department. The software performs heat release analysis for the following conditions: the combustion process has been completed by the time the exhaust valve opens, and also the total value of the relative amount of the heat released during the full and complete combustion process is equal to x = xi + xstr = 1. Computations are performed until the opening of the exhaust valve, in the direction towards the start of combustion. The computations made by the INDY2 software take into account changes in the amount of combustion products during the process, changes in specific heats which are dependent on the composition and temperature of the working medium, and also heat losses caused by heat transfer from the working medium to the walls of the process-encompassing area, and others caused by, e.g., dissociation, incomplete combustion, etc.

3

Selected load characteristics of 1.3 MultiJet engine

Ambrozik A., Ambrozik T., Kurczyński D., Łagowski P.

Journal of KONES

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2010

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Vol. 17, No. 2

9-15

EN

The paper presents results of investigations and the assessment of multi-stage fuel injection in MultiJet 1.3 engine operating under load conditions. Basic work parameters of the examined piston internal combustion engine, such as: effective power, torque, hour and unit fuel consumption and the concentration of the most important noxious components of exhaust gases were provided. Tests were conducted at the test bench stand that comprised the engine under consideration, eddy-current brake by Elektromex EMX company, control and measurement unit to control the test bench and to take measurements of parameters of the engine and brake work, the measurement system for fast-changing quantities, fuel-flow and air-flow meters, and the exhaust gas analyser. During the tests, the engine operated under load conditions at the crankshaft rotational speed: n=l200, 1750, 2400, 3800 and 4200 rpm. Such values of speed were selected because of the multi-stage fuel injection and the engine's being able to reach the maximum torque M=200Nm at the crankshaft rotational speed n = 1750 rpm and the maximum power output N=90HP, delivered at n=4200 rpm. Application of advanced engine technologies and advanced control system allowed meeting high requirements concerning energy and economic as well as environmental indices.