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research-article

Optimization of the Charge Motion in Internal Combustion Engines Driven by Sewage Gas for Combined Heat and Power Units

[+] Author and Article Information
Lucas Konstantinoff

Doctoral Student Dept. of Technology and Life Sciences Engines and Emissions MCI Management Center Innsbruck Innsbruck, Tirol Austria
lucas.konstantinoff@mci.edu

Lukas Möltner

Professor Dept. of Technology and Life Sciences MCI Management Center Innsbruck Innsbruck, Tirol Austria
lukas.moeltner@mci.edu

Martin Pillei

Lecturer Dept. of Technology and Life Sciences MCI Management Center Innsbruck Innsbruck, Tirol Austria
martin.pillei@mci.edu

Thomas Steiner

Graduate Research Assistants Dept. of Technology and Life Sciences MCI Management Center Innsbruck Innsbruck, Tirol Austria
thomas.steiner@mci.edu

Thomas Dornauer

Graduate Research Assistants Dept. of Technology and Life Sciences MCI Management Center Innsbruck Innsbruck, Tirol Austria
dt0906@mci4me.at

Günther Herdin

CEO PGES GmbH Jenbach, Tirol Austria
g.herdin@prof-ges.com

Dominik Mairegger

Graduate Research Assistant PGES GmbH Jenbach, Tirol Austria
d.mairegger@prof-ges.com

1Corresponding author.

ASME doi:10.1115/1.4039756 History: Received March 01, 2018; Revised March 02, 2018

Abstract

In this study, the influence of the charge motion on the internal combustion in a spark ignition sewage gasdriven engine (150 kW) for combined heat and power units was investigated. For this purpose, the geometry of the combustion chamber in the immediate vicinity to the inlet valve seats was modified. The geometrical modification measures were conducted iteratively by integrative determination of the swirl motion on a flow bench, by laseroptical methods and consecutively by combustion analysis on a test engine. Two different versions of cylinder heads were characterized by dimensionless flow and swirl numbers prior to testing their on-engine performance. Combustion analysis was conducted with a cylinder pressure indication system for partial and full load, meeting the mandatory NOx limit of 500 mgm-3. Subsuming the flow bench results, the new valve seat design has a significant enhancing impact on the swirl motion but it also leads to disadvantages concerning the volumetric efficiency. A comparative consideration of the combustion rate delivers that the increased swirl motion results in a faster combustion, hence in a higher efficiency. In summary, the geometrical modifications close to the valve seat result in increased turbulence intensity. It was proven that this intensification raises the ratio of efficiency by 1.6%.

Copyright (c) 2018 by ASME
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