Abstract
In the article, a novel test rig for determining the friction losses of modern turbocharger is presented. The friction torque of the bearing of turbocharger can be measured direct and stationary at any speed up to 100,000 min–1 by the friction test rig developed by the Ostfalia, University of Applied Science (UAS). Since 2010, over 50 turbochargers were measured on the test bench in extensive measurement series. The results give valuable and new insights of the influence of the next parameters on the bearing friction losses: oil temperature, oil pressure, thrust force and oil flow rate. Furthermore, a comparison between the different bearing types (semi-floating, full floating and ball bearings) was performed. The main observations and results are discussed in the scientific article.
Highlights
One of the possibilities to improve the efficiency new combustion engines is to optimize the turbocharging systems
The research group for thermodynamics and alternative driving systems of the Ostfalia, University of Applied Science (UAS) in Wolfsburg works, since 2010 on a friction test rig to determine with different measuring method the friction losses of turbocharger bearings
A specially developed and designed friction power test rig is introduced in this article
Summary
One of the possibilities to improve the efficiency new combustion engines is to optimize the turbocharging systems. A turbocharger with high efficiency and excellent dynamic properties is essential for low fuel consumption combined with good driving performance. A CFD simulation can be used for a forecast of the turbine and compressor efficiencies. On a powerful hot gas test rig the simulated results can be confirmed [1]. Within the framework of research projects the simulation models have been established in order to calculate the lubricating properties of journal and thrust bearings. The research group for thermodynamics and alternative driving systems of the Ostfalia, UAS in Wolfsburg works, since 2010 on a friction test rig to determine with different measuring method the friction losses of turbocharger bearings
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