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research-article

Influence of Injection Parameters and Operating Conditions on Ignition and Combustion in Dual-Fuel Engines

[+] Author and Article Information
Marcus Grochowina

Institute of Thermodynamics, Technical University of Munich, 85747 Garching, Germany
grochowina@td.mw.tum.de

Michael Schiffner

Institute of Thermodynamics, Technical University of Munich, 85747 Garching, Germany
mschiffner@td.mw.tum.de

Simon Tartsch

Institute of Thermodynamics, Technical University of Munich, 85747 Garching, Germany
simon.tartsch@gmx.de

Thomas Sattelmayer

Institute of Thermodynamics, Technical University of Munich, 85747 Garching, Germany
sattelmayer@td.mw.tum.de

1Corresponding author.

ASME doi:10.1115/1.4040089 History: Received February 22, 2018; Revised March 06, 2018

Abstract

Dual-Fuel (DF) engines offer great fuel flexibility since they can either run on gaseous or liquid fuels. In the case of Diesel pilot ignited DF-engines the main source of energy is provided by gaseous fuel, whereas the Diesel fuel acts only as an ignition source. Therefore, a proper autoignition of the pilot fuel is of utmost importance for combustion in DF-engines. However, autoignition of the pilot fuel suffers from lower compression temperatures of Miller valve timings. These valve timings are applied to increase efficiency and lower nitrogen oxide engine emissions. In order to improve the ignition, it is necessary to understand which parameters influence the ignition in DF-engines. For this purpose, experiments were conducted and the influence of parameters such as injection pressure, pilot fuel quantity, compression temperature and air-fuel equivalence ratio of the homogenous natural gas-air mixture were investigated. The experiments were performed on a periodically chargeable combustion cell using optical high-speed recordings and thermodynamic measurement techniques for pressure and temperature. The study reveals that the quality of the Diesel pilot ignition significantly depends on the injection parameters and operating conditions. In most cases, the pilot fuel suffers from too high dilution due to its small quantity and long ignition delays. This results in a small number of ignited sprays and consequently leads to longer combustion durations. Furthermore, the experiments confirm that the natural gas of the background mixture influences the autoignition of the Diesel pilot oil.

Copyright (c) 2018 by ASME
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