Influence of Combustion Chamber Deposits on Wall Heat Losses
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Deposits in the combustion chamber of combustion engines have a decisive influence on the wall heat transfer and thus on the operating conditions under certain circumstances. Above all, the change in thermal conductivity as a function of the operating point is of interest. At KIT, the fuel-wall interaction effects were investigated as part of subproject C02 of the Collaborative Research Center/Transregio 150.
Climate change and air pollution are more than ever discussed topics in the line with engine development. To increase efficiency and reduce fuel consumption downsizing has been established in the market during the last years. In smaller engines the reduced free path for the fuel spray leads to intensified interaction with combustion chamber walls (liner and piston). As a result Combustion Chamber Deposit (CCD) formation can be increased resulting in various effects. The most important ones are described by Kalghatgi . It is reported that CO2output decreases with...
The research project has been performed as part of the German Research Foundation's (DFG) Collaborative Research Center 150 in subproject C02. The authors want to thank the DFG for funding this project. Special thanks to Philipp Hänichen from Technische Universität Darmstadt for the support on the roughness measurements and Volker Zibat from KIT LEM for conducting the SEM measurements.