10th Symposium "The Working Process of the Internal Combustion Engine"
Turbocharger Compressor Maps Interpretation and Simulation
Authors
Dr. M.A. Skopil, Wärtsilä Schweiz AG, Winterthur
Year
2005
Summary
The demand for higher power density in diesel and petrol engines and the strongly risen demands for fast response of the engine-turbocharger system let more and more sophisticated solutions get practicable. To reach a goal-directed optimization sophisticated simulation tools are used in which the specific turbocharger performance is stored in maps. This circumstance includes the risk that data is used without knowing and understanding the physical background and the consequences on the simulation. Especially the turbo compressor data is often “slightly” manipulated or, if the correct one is not available scaled to be able to run a simulation. That this can have some undesirable consequences in practical testing is clear. Particularly is illustrated how design features like vaned and vaneless diffusors but also effects like jet-wake or rotating stall have an influence on the main compressor performance data, like pressure ratio, surge and choke line as well as the impact on the efficiency and the static and dynamic running stability.
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