Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of Global Power and Propulsion Society |
| Subtitle of host publication | Beijing Conference 2019, 16th-18th September, 2019 |
| Number of pages | 9 |
| Publication status | Published - 2019 |
| Event | Global Power and Propulsion Society - Beijing, China Duration: 16 Sept 2019 → 18 Sept 2019 |
Publication series
| Name | Proceedings of Global Power and Propulsion Society |
|---|---|
| ISSN (electronic) | 2504-4400 |
Abstract
the stator axial chord. A framework for identifying sources of loss typical in turbomachinery is derived and utilized for the low-pressure turbine presented. The analysis focuses on the dependency of these losses on the axial-gap variation. It is found that two-dimensional profile losses increase for smaller gaps due to higher wake-mixing losses and unsteady wake-blade interaction. Losses in the end-wall regions, however, decrease for smaller gaps. The total system efficiency can be described by a superposition of individual loss contributions, the optimum of which is found for the smallest gap investigated. It is concluded that these loss contributions are characteristic for the medium
aspect-ratio airfoils and operating conditions investigated. This establishes a deeper physical understanding for future investigations into the axial-gap size effect and its interdependency with other design parameters.
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Proceedings of Global Power and Propulsion Society: Beijing Conference 2019, 16th-18th September, 2019. 2019. (Proceedings of Global Power and Propulsion Society).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research
}
TY - GEN
T1 - Loss Assessment of the Axial-Gap Size Effect in a Low-Pressure Turbine
AU - Oettinger, Marcel
AU - Mimic, Dajan
AU - Henke, Michael
AU - Schmunk, Oleg
AU - Seume, Joerg R.
N1 - Funding information: We gratefully acknowledge the substantial contribution of the DLR Institute of Propulsion Technology and MTU Aero Engines AG for providing TRACE.
PY - 2019
Y1 - 2019
N2 - The aim of this work is the decomposition, quantification, and analysis of losses related to the axial gap size effect. Both experimental data and unsteady RANS calculations are investigated for axial gaps equal to 20 % , 50 % and 80 % ofthe stator axial chord. A framework for identifying sources of loss typical in turbomachinery is derived and utilized for the low-pressure turbine presented. The analysis focuses on the dependency of these losses on the axial-gap variation. It is found that two-dimensional profile losses increase for smaller gaps due to higher wake-mixing losses and unsteady wake-blade interaction. Losses in the end-wall regions, however, decrease for smaller gaps. The total system efficiency can be described by a superposition of individual loss contributions, the optimum of which is found for the smallest gap investigated. It is concluded that these loss contributions are characteristic for the mediumaspect-ratio airfoils and operating conditions investigated. This establishes a deeper physical understanding for future investigations into the axial-gap size effect and its interdependency with other design parameters.
AB - The aim of this work is the decomposition, quantification, and analysis of losses related to the axial gap size effect. Both experimental data and unsteady RANS calculations are investigated for axial gaps equal to 20 % , 50 % and 80 % ofthe stator axial chord. A framework for identifying sources of loss typical in turbomachinery is derived and utilized for the low-pressure turbine presented. The analysis focuses on the dependency of these losses on the axial-gap variation. It is found that two-dimensional profile losses increase for smaller gaps due to higher wake-mixing losses and unsteady wake-blade interaction. Losses in the end-wall regions, however, decrease for smaller gaps. The total system efficiency can be described by a superposition of individual loss contributions, the optimum of which is found for the smallest gap investigated. It is concluded that these loss contributions are characteristic for the mediumaspect-ratio airfoils and operating conditions investigated. This establishes a deeper physical understanding for future investigations into the axial-gap size effect and its interdependency with other design parameters.
U2 - 10.33737/gpps19-bj-207
DO - 10.33737/gpps19-bj-207
M3 - Conference contribution
T3 - Proceedings of Global Power and Propulsion Society
BT - Proceedings of Global Power and Propulsion Society
T2 - Global Power and Propulsion Society
Y2 - 16 September 2019 through 18 September 2019
ER -