Details
| Original language | English |
|---|---|
| Title of host publication | ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition |
| Subtitle of host publication | Turbomachinery |
| Publisher | American Society of Mechanical Engineers(ASME) |
| Volume | 2C |
| ISBN (electronic) | 9780791884089 |
| Publication status | Published - 11 Jan 2021 |
| Event | ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT 2020 - online, Virtual, Online Duration: 21 Sept 2020 → 25 Sept 2020 |
Abstract
While turbocharging is a key technology for improving the performance and efficiency of internal combustion engines, the operating behavior of the turbocharger is highly dependent on the rotor temperature distribution as it directly modifies viscosity and clearances of the fluid film bearings. Since a direct experimental identification of the rotor temperature of an automotive turbocharger is not feasible at an acceptable expense, a combination of numerical analysis and experimental identification is applied to investigate its temperature characteristic and level. On the one hand, a numerical conjugate heat transfer (CHT) model of the automotive turbocharger investigated is developed using a commercial CFD-tool and a bidirectional, thermal coupling of the CFD-model with thermohydrodynamic lubrication simulation codes is implemented. On the other hand, experimental investigations of the numerically modelled turbocharger are conducted on a hot gas turbocharger test rig for selected operating points. Here, rotor speeds range from 64.000 to 168.000 rpm. The turbine inlet temperature is set to 600°C and the lubricant is supplied at a pressure of 300 kPa with 90°C to ensure practically relevant boundary conditions. Comparisons of measured and numerically predicted local temperatures of the turbocharger components indicate a good agreement between the analyses. The calorimetrically determined frictional power loss of the bearings as well as the floating ring speed are used as additional validation parameters. Evaluation of heat flow of diabatic simulations indicates a high sensitivity of local temperatures to rotor speed and load. A cooling effect of the fluid film bearings is present. Consequently, results confirm the necessity of the diabatic approach to the heat flow analysis of turbocharger rotors.
Keywords
- CFD, CHT, Experimental, Heat transfer, Temperature, Thermophysical, Turbomachinery
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition : Turbomachinery. Vol. 2C American Society of Mechanical Engineers(ASME), 2021. V02CT35A051.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Evaluation of the rotor temperature distribution of an automotive turbocharger under hot gas conditions including indirect experimental validation
AU - Zeh, Christopher
AU - Willers, Ole
AU - Hagemann, Thomas
AU - Schwarze, Hubert
AU - Seume, Joerg R.
PY - 2021/1/11
Y1 - 2021/1/11
N2 - While turbocharging is a key technology for improving the performance and efficiency of internal combustion engines, the operating behavior of the turbocharger is highly dependent on the rotor temperature distribution as it directly modifies viscosity and clearances of the fluid film bearings. Since a direct experimental identification of the rotor temperature of an automotive turbocharger is not feasible at an acceptable expense, a combination of numerical analysis and experimental identification is applied to investigate its temperature characteristic and level. On the one hand, a numerical conjugate heat transfer (CHT) model of the automotive turbocharger investigated is developed using a commercial CFD-tool and a bidirectional, thermal coupling of the CFD-model with thermohydrodynamic lubrication simulation codes is implemented. On the other hand, experimental investigations of the numerically modelled turbocharger are conducted on a hot gas turbocharger test rig for selected operating points. Here, rotor speeds range from 64.000 to 168.000 rpm. The turbine inlet temperature is set to 600°C and the lubricant is supplied at a pressure of 300 kPa with 90°C to ensure practically relevant boundary conditions. Comparisons of measured and numerically predicted local temperatures of the turbocharger components indicate a good agreement between the analyses. The calorimetrically determined frictional power loss of the bearings as well as the floating ring speed are used as additional validation parameters. Evaluation of heat flow of diabatic simulations indicates a high sensitivity of local temperatures to rotor speed and load. A cooling effect of the fluid film bearings is present. Consequently, results confirm the necessity of the diabatic approach to the heat flow analysis of turbocharger rotors.
AB - While turbocharging is a key technology for improving the performance and efficiency of internal combustion engines, the operating behavior of the turbocharger is highly dependent on the rotor temperature distribution as it directly modifies viscosity and clearances of the fluid film bearings. Since a direct experimental identification of the rotor temperature of an automotive turbocharger is not feasible at an acceptable expense, a combination of numerical analysis and experimental identification is applied to investigate its temperature characteristic and level. On the one hand, a numerical conjugate heat transfer (CHT) model of the automotive turbocharger investigated is developed using a commercial CFD-tool and a bidirectional, thermal coupling of the CFD-model with thermohydrodynamic lubrication simulation codes is implemented. On the other hand, experimental investigations of the numerically modelled turbocharger are conducted on a hot gas turbocharger test rig for selected operating points. Here, rotor speeds range from 64.000 to 168.000 rpm. The turbine inlet temperature is set to 600°C and the lubricant is supplied at a pressure of 300 kPa with 90°C to ensure practically relevant boundary conditions. Comparisons of measured and numerically predicted local temperatures of the turbocharger components indicate a good agreement between the analyses. The calorimetrically determined frictional power loss of the bearings as well as the floating ring speed are used as additional validation parameters. Evaluation of heat flow of diabatic simulations indicates a high sensitivity of local temperatures to rotor speed and load. A cooling effect of the fluid film bearings is present. Consequently, results confirm the necessity of the diabatic approach to the heat flow analysis of turbocharger rotors.
KW - CFD
KW - CHT
KW - Experimental
KW - Heat transfer
KW - Temperature
KW - Thermophysical
KW - Turbomachinery
UR - http://www.scopus.com/inward/record.url?scp=85099777683&partnerID=8YFLogxK
U2 - 10.1115/GT2020-16077
DO - 10.1115/GT2020-16077
M3 - Conference contribution
AN - SCOPUS:85099777683
VL - 2C
BT - ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition
PB - American Society of Mechanical Engineers(ASME)
T2 - ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT 2020
Y2 - 21 September 2020 through 25 September 2020
ER -