The application of turbochargers in combustion engines became significantly more important in the recent years. In the passenger car sector almost all diesel engines and more and more gasoline engines are equipped with a turbocharger.
Compressor wheels on exhaust turbochargers in car and truck applications are highly stressed components. During the development of new compressor wheels the focus is to design reliable parts with a reasonable lifetime as well as good efficiencies and low torpor providing improved engine efficiency and better dynamic engine performance. In order to fulfill the exceptional requirements on the thermodynamic characteristics of the turbocharger the material of the compressor wheel underlies high mechanical and thermal loads.
Boundary conditions on the compressor wheel including wall heat transfer coefficients and wall adjacent temperatures are provided by static heat transfer calculations. The boundary conditions are necessary for transient heat transfer calculations in FEA. The use of turbocharger technology in small combustion engines is also called “Downsizing”. The reduction of weight, and friction losses and the increased mean pressure in comparison to uncharged combustion engines lead to improved engine efficiency and lower CO2-emmissions.
Modern steam turbine designs are exploring wider design space to gain improved performance. At the same time, the mechanical integrity of the steam turbine needs to be maintained. This requires an in-depth understanding of the effects of each design variable on High Cycle Fatigue (HCF) of a steam turbine stage.
A rapidly growing market share of turbocharged gasoline engines is expected over the next years. The request on small turbocharged combustion engines with higher power density and higher engine efficiency.
Reference
Breard, C., Vahdati, M., Sayma, A.I. and Imregun, M., 2000, “An Integrated time-domain aeroelasticity model for the prediction of fan forced response due to inlet distortion”, ASME
2000-GT-0373.
Baines, N. C. Fundamentals of Turbocharging. Vermont : Concepts NREC, 2005.
Post time: Mar-06-2022