Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of Global Power & Propulsion Society |
| Number of pages | 11 |
| Publication status | Published - 6 Sept 2024 |
Publication series
| Name | Proceedings of Global Power & Propulsion Society |
|---|---|
| ISSN (Print) | 2504-4400 |
Abstract
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Proceedings of Global Power & Propulsion Society. 2024. (Proceedings of Global Power & Propulsion Society).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Variable turbine geometry for an automotive turbocharger with a small axial turbine
AU - Kuestner, Christoph
AU - Helmsen, Eike
AU - Seume, Joerg R.
PY - 2024/9/6
Y1 - 2024/9/6
N2 - The paper examines the implementation of a variable turbine geometry (VTG) and the reduction of its tip leakage losses in a small axial turbine turbocharger for charging lean-burn internal combustion engines. Due to the small turbine size, a reduction in the number of vanes and a redesign was required to match the design point of the non-adjustable stator. Subsequently, discs were added to the vanes’ ends to seal the radial gaps in the VTG. The turbine size prohibited a full sealing on the hub side, leaving small gaps at the leading edge (LE) and trailing edge (TE). To evaluate their influence, three gap configurations of the adjusted design (constant hub gap, partial gaps at LE and TE, and non-gap) were compared with the initial design using CFD simulations. The results showed that the partial gap configuration was able to reduce the maximum mass flow rate deviations at the investigated turbine speed down to 0.8% while maintaining the same turbine efficiencies as the non-gap configuration. Finally, the performance map was evaluated for the partial gap configuration, which showed that the turbine required a slightly larger pivot angle range to meet the specified requirements.
AB - The paper examines the implementation of a variable turbine geometry (VTG) and the reduction of its tip leakage losses in a small axial turbine turbocharger for charging lean-burn internal combustion engines. Due to the small turbine size, a reduction in the number of vanes and a redesign was required to match the design point of the non-adjustable stator. Subsequently, discs were added to the vanes’ ends to seal the radial gaps in the VTG. The turbine size prohibited a full sealing on the hub side, leaving small gaps at the leading edge (LE) and trailing edge (TE). To evaluate their influence, three gap configurations of the adjusted design (constant hub gap, partial gaps at LE and TE, and non-gap) were compared with the initial design using CFD simulations. The results showed that the partial gap configuration was able to reduce the maximum mass flow rate deviations at the investigated turbine speed down to 0.8% while maintaining the same turbine efficiencies as the non-gap configuration. Finally, the performance map was evaluated for the partial gap configuration, which showed that the turbine required a slightly larger pivot angle range to meet the specified requirements.
U2 - 10.33737/gpps24-tc-026
DO - 10.33737/gpps24-tc-026
M3 - Conference contribution
T3 - Proceedings of Global Power & Propulsion Society
BT - Proceedings of Global Power & Propulsion Society
ER -