Transient Temperature Field in a Radial Turbine Wheel



In the development of exhaust gas turbochargers, the question of the turbine wheels life span is becoming increasingly important. Decisive for the lifespan of exhaust gas turbocharger turbines are low-frequency excitations caused by the high variety of load cycles during operation. Within one cycle, flow states and heat transfer in the turbine change permanently.

The thermal load on the turbine wheel is a decisive factor for lifetime calculations taking into account these excitations. Usually, stress calculations for turbine wheel lifespan calculations are carried out at a constant component temperature. The material strength values ​​are also determined at a constant temperature. Consequently, only influences of the centrifugal force and temperature-dependent strength properties on the lifespan are taken into account. Influences of the variable temperature profile in the solid body and the thermal stress induced thereby are only taken into account by safety factors.



In order to determine the non-stationary temperature field in the turbine wheel, a heat transfer correlation is developed experimentally and numerically, which represents the transient surface temperature field of the turbine wheel.



This project of the Research Association for Combustion Engines (FVV) has been funded by the Federal Ministry for Economic Affairs and Energy (BMWi) in line with the program for the promotion of industrial community research (IGF) in a period of 2.5 years.



Mathias Diefenthal, Christian Rakut, Hailu Tadesse, Manfred Wirsum, Tom Heuer
Temperature Gradients in a Radial Turbine in Steady State and Transient Operation, Proceedings of International Gas Turbine Congress 2015 Tokyo, p. 875-882, Nov. 15-20, 2015

Mathias Diefenthal, Christian Rakut, Hailu Tadesse, Manfred Wirsum
Temperature Distribution in a Radial Turbine Wheel during Transient Operation, MTZ worldwide Issue no.: 2015-09

Hailu Tadesse, Christian Rakut, Mathias Diefenthal, Manfred Wirsum und Tom Heuer
Experimental Investigation of Steady State and Transient Heat Transfer in a Radial Turbine Wheel of a Turbocharger, ASME Turbo Expo 2015, GT2015-43165, Montreal, Quebec, Canada, June 15–19, 2015

Mathias Diefenthal, Hailu Tadesse, Christian Rakut, Manfred Wirsum, Tom Heuer
, ASME Turbo Expo 2014, GT2014-26327

Mathias Diefenthal, Hailu Tadesse, Christian Rakut, Manfred Wirsum, Tom Heuer
Experimental and Numerical Investigation of Temperature Fields in a Radial Turbine Wheel
15th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Feb. 24-28, 2014, , Honolulu, Hawaii, USA