Weiß L, Wensing M (2017)
Publication Language: English
Publication Type: Conference contribution, Conference Contribution
Publication year: 2017
The heat transfer between combusting diesel sprays and piston walls in IC engines is mostly described by empirical models instead of physical knowledge.
Many influences on the wall heat transfer interfere with each other. This makes it difficult to investigate single parameters, which would be necessary for physical descriptions. Optical spray chambers offer test conditions suitable for such investigations. Thus pervious work describes the heat transfer of impinging diesel sprays on flat walls under diesel relevant conditions or the influence of the impingement on the combustion of diesel fuel. Parameters like ambient conditions, wall distance and injection pressure were studied.
Due to increasing power densities of IC engines the wall material is a new parameter that has to be addressed. The increasing thermal and mechanical loads onto the piston demand changes in the used material or the surface after treatment. Accordingly, the resulting surface temperatures and heat fluxes are interdependent with the combustion.
In this work, we show the temporal evolution of surface temperatures of different wall materials under impinging diesel flames in a constant pressure combustion chamber. The flames are planar characterized by their soot temperature (KL-method) and their heat release rates (OH radical appearance).
Based on these investigations the influence of wall materials and their surface temperature on flame temperature, ignition delay and burn rate are analyzed and can be considered in the development of next generation diesel engines.
A direct transfer to engine processes is not possible, but this work is another step to a deeper physical knowledge of the heat transfer in IC engines. Comparing the experimental measurements to simulation results would increase the confidence in their models.
Weiß, L., & Wensing, M. (2017). Correlation between Piston Surface Temperature and Piston Material and Their Influence on Spray-Wall-Interaction and Spray Combustion. In Proceedings of the The 9th International Conference on Modelling and Diagnostics for Advanced Engine Systems (COMODIA 2017). Okayama Convention Center, JP.
Weiß, Lukas, and Michael Wensing. "Correlation between Piston Surface Temperature and Piston Material and Their Influence on Spray-Wall-Interaction and Spray Combustion." Proceedings of the The 9th International Conference on Modelling and Diagnostics for Advanced Engine Systems (COMODIA 2017), Okayama Convention Center 2017.