TY - CHAP A1 - Frank, Andrea A1 - Haake, Stefanie A1 - Kaduk, Svenja A1 - Heuchemer, Sylvia A1 - Linde, Frank A1 - Szczyrba, Birgit A1 - Nacken, Heribert A1 - Wex, Peter A1 - Müller, Kristina A1 - Paskarbies, Nils A1 - Deneke, Michael A1 - May, Dominik A1 - König, Claus A1 - Fleischmann, Andreas A1 - Dressel, Kathrin A1 - Ritzenhoff, Peter A1 - Jungmann, Thorsten ED - Jorzik, Bettina T1 - Lehren-Lernen-Prüfen T2 - Charta guter Lehre KW - Lehren – Lernen – Prüfen KW - Beratung und Betreuung KW - Curriculumentwicklung KW - Personalentwicklung KW - Motivations- und Anreizsysteme KW - Organisationsentwicklung KW - Qualitätsmanagement KW - Governance KW - Rahmenbedingungen KW - Forschung in der Hochschulbildung Y1 - 2013 SN - 978-3-922275-55-8 SP - 11 EP - 24 PB - Verwaltungsgesellschaft für Wissenschaftspflege mbH CY - Essen ER - TY - GEN A1 - Franken, Tim A1 - Seidel, Lars A1 - Matrisciano, Andrea A1 - Mauß, Fabian A1 - Kulzer, Andre Casal A1 - Schuerg, Frank T1 - Analysis of the Water Addition Efficiency on Knock Suppression for Different Octane Ratings T2 - SAE World Congress N2 - Water injection can be applied to spark ignited gasoline engines to increase the Knock Limit Spark Advance and improve the thermal efficiency. The Knock Limit Spark Advance potential of 6 °CA to 11 °CA is shown by many research groups for EN228 gasoline fuel using experimental and simulation methods. The influence of water is multi-layered since it reduces the in-cylinder temperature by vaporization and higher heat capacity of the fresh gas, it changes the chemical equilibrium in the end gas and increases the ignition delay and decreases the laminar flame speed. The aim of this work is to extend the analysis of water addition to different octane ratings. The simulation method used for the analysis consists of a detailed reaction scheme for gasoline fuels, the Quasi-Dimensional Stochastic Reactor Model and the Detonation Diagram. The detailed reaction scheme is used to create the dual fuel laminar flame speed and combustion chemistry look-up tables. The Detonation Diagram is used as a novel approach in the Quasi-Dimensional Stochastic Reactor Model to evaluate the auto-ignition characteristic in the end gas and determine if it is a harmless deflagration or developing detonation. First, the Quasi-Dimensional Stochastic Reactor Model is trained for three engine operating points and a RON95 E10 fuel. Its performance is evaluated based on experimental results of a single cylinder research engine. Subsequently, different spark timings and water-fuel ratios are investigated for different Primary Reference Fuels. The results outline that water addition can effectively reduce the strength of auto-ignition in the end gas for different Primary Reference Fuels. Thereby, it can be stated that the reduction of the auto-ignition strength through water addition by 50 – 80 % water-fuel ratio for high octane number fuels corresponds to the spark timing delay of 6 °CA or an increase of research octane number by 10 points. KW - Gasoline KW - Knock KW - Water KW - Engines KW - Combustion KW - Simulation Y1 - 2020 U6 - https://doi.org/10.4271/2020-01-0551 SN - 2688-3627 SN - 0148-7191 ER - TY - CHAP A1 - Bartl, Steffen A1 - Biemelt, Detlef A1 - Schapp, Andrea A1 - Henze, Frank A1 - Gerke, Horst H. T1 - A field rainfall simulator system for the analysis of runoff and infiltration interactions related to soil surface structures Y1 - 2010 UR - http://meetingorganizer.copernicus.org/EGU2010/EGU2010-9950.pdf ER -