LIF Laser Scanning with pent roof illumination to Investigate Mixture Distribution in IC Engines with limited Optical Access
Welß R, Wensing M (2016)
Publication Language: English
Publication Type: Conference contribution, Conference Contribution
Publication year: 2016
Event location: Lissabon
URI: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/
Abstract
Modern IC engines are realized with direct fuel injection, so the mixture formation takes place in the cylinder.
Optical accessible engines allow a detailed investigation of the injection and mixture formation process. The
measurement technique which is presented in this work is the tracer based Laser-induced fluorescence, which
allows to quantify the air-fuel equivalence ratio in the engine. With this technique, only a single plane, which is
illuminated by a lightsheet, is investigated. The new approach which is presented in this work is the Lightsheet
scanning technique. To realize this approach the lightsheet is shifted laterally and several planes in the cylinder can
be investigated. The focus in this work is to estimate the maximal cylinder which can be measured with this
principle. Additionally, this idea is combined with a modified optical setup for the lightsheet forming to illuminate
the pentroof through the glass ring without using a piston window. Different optical setups are studied to realize
the best possible illumination of the pentroof. The chosen setup which was used finally is combined with the
lightsheet scanning setup and used for the experiments. To align the optical setup fast and reliable to the different
measurement planes, all relevant parts, lenses, mirror and camera, are mounted on electrically driven linear stages.
The engine measurement results show the successful application of the developed method. In detail, two engine
operating points are investigated and only the water temperature is varied. The method enables the reconstruction
of any cross-sections, so that the spray targeting during the injection is shown in detail and differences between the
two operating points are identified. The quality and progress of the mixture formation is evaluated by the
uniformity index, which is calculated from every recorded plane. Additionally, the air-fuel ratio is also averaged
over every plane and displayed over the crank angle to verify the results.
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How to cite
APA:
Welß, R., & Wensing, M. (2016). LIF Laser Scanning with pent roof illumination to Investigate Mixture Distribution in IC Engines with limited Optical Access. In Proceedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics. Lissabon, PT.
MLA:
Welß, Richard, and Michael Wensing. "LIF Laser Scanning with pent roof illumination to Investigate Mixture Distribution in IC Engines with limited Optical Access." Proceedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, Lissabon 2016.
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