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Ann-Christin Preuss

Ann-Christin Preuss
  • Master of Science
  • Institute for Analytical Measurement Technology Hamburg e.V.

About

13
Publications
508
Reads
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40
Citations
Current institution
Institute for Analytical Measurement Technology Hamburg e.V.

Publications

Publications (13)
Article
Pilot-ignition Otto marine engines are known for greatly reduced emissions of air pollutants (sulphur oxides, nitrogen oxide, particulates) compared to marine diesel engines. However, lubricating oil emissions still are about one order of magnitude higher than in land-based systems. To identify reduction potentials, a better understanding of oil em...
Conference Paper
div class="section abstract"> Photochromism is a reversible color change phenomenon based on chemical reactions caused by light illumination. In the present study, this technique is applied to visualize the lubricating oil and fuel around the piston rings in the gasoline engine. The oil film was colored with a UV laser and photographed by synchroni...
Conference Paper
div class="section abstract"> Future demands for modern emission free drivetrains using hydrogen or liquid e-fuels also necessitate a fundamental reduction in oil emissions. Entry of lubrication oil into the combustion chamber can lead to pre-combustion phenomena (LSPI) in downsizing or hydrogen engines and is a cause of particle emissions, which p...
Article
Full-text available
The lubrication of the wrist-pin journal can become a limiting factor of the performance of internal combustion engines. The wrist-pin journal is a hydro-dynamic bearing with a radial clearance of only a few microns that is filled with a mixture of oil and air. Moreover, the radial clearance changes periodically with the piston motion and according...
Conference Paper
Car emission standards are getting more stringent in the future. To reduce the emission of hydrocarbons and other combustion products, the highly dynamic process in the cylinder has to be understood. Taking into account the high pressure (250 bar/3600PSI) and the pressure and temperature gradients in diesel engine, a fast high temperature direct in...

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