Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT2020 |
| Publisher | American Society of Mechanical Engineers(ASME) |
| Volume | 9: Oil and Gas Applications; Organic Rankine Cycle Power Systems; Steam Turbine |
| ISBN (electronic) | 9780791884201 |
| Publication status | Published - 2020 |
| Event | ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT 2020 - online, Virtual, Online Duration: 21 Sept 2020 → 25 Sept 2020 |
Abstract
The Organic Rankine Cycle (ORC) represents an emerging technology aimed at exploiting lower temperature heat sources, like waste heat in industrial processes or exhaust heat in combustion engines. One key aspect of this technology is an efficient and economical operation at part load, typically realized by a partial admission control, which is challenging to predict numerically. Full annulus computation can only be avoided applying empirical partial admission loss models to conventional full-admission computations. This article aims at assessing the reliability of such a loss model under real-gas and supersonic conditions as a first step towards knowledge-based improved loss models. Three different operating points of an 18.3 kW ORC turbine working with an ethanol-water mixture with two open stator passages (2 x 36°) are considered. Full annulus CFD computations are compared to experimental data and results of simulations in a conventional, full admission, periodic 72°-sector model with application of a 1D partial admission loss model. The experimentally obtained mass flow rate and efficiency are matched overall within their measurements accuracy. By highest inlet total pressure, the computed efficiency deviates about 4 % from the experiments. Predictions of efficiency based on the full admission and loss model correction deviate from full annulus computations less than 1 %. These findings suggest that the used empirical correlations for partial admission losses can provide acceptable results in the configuration under investigation.
Keywords
- Axial turbine, Loss model, Organic rankine cycle, Partial admission, Real gas CFD, Supersonic
ASJC Scopus subject areas
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Proceedings of ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT2020. Vol. 9: Oil and Gas Applications; Organic Rankine Cycle Power Systems; Steam Turbine American Society of Mechanical Engineers(ASME), 2020. V009T22A002.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Numerical investigation of a partially loaded supersonic orc turbine stage
AU - Ziaja, Karl
AU - Post, Pascal
AU - Sembritzky, Marwick
AU - Schramm, Andreas
AU - Willers, Ole
AU - Kunte, Harald
AU - Seume, Jörg
AU - di Mare, Francesca
PY - 2020
Y1 - 2020
N2 - The Organic Rankine Cycle (ORC) represents an emerging technology aimed at exploiting lower temperature heat sources, like waste heat in industrial processes or exhaust heat in combustion engines. One key aspect of this technology is an efficient and economical operation at part load, typically realized by a partial admission control, which is challenging to predict numerically. Full annulus computation can only be avoided applying empirical partial admission loss models to conventional full-admission computations. This article aims at assessing the reliability of such a loss model under real-gas and supersonic conditions as a first step towards knowledge-based improved loss models. Three different operating points of an 18.3 kW ORC turbine working with an ethanol-water mixture with two open stator passages (2 x 36°) are considered. Full annulus CFD computations are compared to experimental data and results of simulations in a conventional, full admission, periodic 72°-sector model with application of a 1D partial admission loss model. The experimentally obtained mass flow rate and efficiency are matched overall within their measurements accuracy. By highest inlet total pressure, the computed efficiency deviates about 4 % from the experiments. Predictions of efficiency based on the full admission and loss model correction deviate from full annulus computations less than 1 %. These findings suggest that the used empirical correlations for partial admission losses can provide acceptable results in the configuration under investigation.
AB - The Organic Rankine Cycle (ORC) represents an emerging technology aimed at exploiting lower temperature heat sources, like waste heat in industrial processes or exhaust heat in combustion engines. One key aspect of this technology is an efficient and economical operation at part load, typically realized by a partial admission control, which is challenging to predict numerically. Full annulus computation can only be avoided applying empirical partial admission loss models to conventional full-admission computations. This article aims at assessing the reliability of such a loss model under real-gas and supersonic conditions as a first step towards knowledge-based improved loss models. Three different operating points of an 18.3 kW ORC turbine working with an ethanol-water mixture with two open stator passages (2 x 36°) are considered. Full annulus CFD computations are compared to experimental data and results of simulations in a conventional, full admission, periodic 72°-sector model with application of a 1D partial admission loss model. The experimentally obtained mass flow rate and efficiency are matched overall within their measurements accuracy. By highest inlet total pressure, the computed efficiency deviates about 4 % from the experiments. Predictions of efficiency based on the full admission and loss model correction deviate from full annulus computations less than 1 %. These findings suggest that the used empirical correlations for partial admission losses can provide acceptable results in the configuration under investigation.
KW - Axial turbine
KW - Loss model
KW - Organic rankine cycle
KW - Partial admission
KW - Real gas CFD
KW - Supersonic
UR - http://www.scopus.com/inward/record.url?scp=85099775543&partnerID=8YFLogxK
U2 - 10.1115/GT2020-15219
DO - 10.1115/GT2020-15219
M3 - Conference contribution
AN - SCOPUS:85099775543
VL - 9: Oil and Gas Applications; Organic Rankine Cycle Power Systems; Steam Turbine
BT - Proceedings of ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT2020
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 -