AUTHORS: Lucas Konstantinoff, Dominik Mairegger, Christoph Pfeifer, Uwe Trattnig, Thomas Dornauer, Lukas Möltner

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ABSTRACT: In this study, the influence of the charge motion on the internal combustion in a sewage gas driven 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 valve seats was modified. The geometrical modification measures were conducted iteratively by integrative determination of the swirl motion on a flow bench 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 mg∙m-3. Subsuming the flow bench results, the new valve seat design has a significant enhancing impact on the swirl motion but also leads to disadvantages concerning the flow rate. A comparative consideration of the combustion rate shows that the increased swirl motion results in faster combustion and hence in higher efficiency. In summary, the geometrical modifications close to the valve seat result in increased turbulence intensity, and it was proven that this intensification raises the ratio of efficiency by 1.6%.

KEYWORDS: Combined heat and power, biogas, turbulent combustion, charge motion

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