Details
| Original language | English |
|---|---|
| Title of host publication | ASME Turbo Expo 2012 |
| Subtitle of host publication | Turbine Technical Conference and Exposition, GT 2012 |
| Pages | 2743-2752 |
| Number of pages | 10 |
| Edition | PARTS A, B, AND C |
| Publication status | Published - 9 Jul 2013 |
| Event | ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012 - Copenhagen, Denmark Duration: 11 Jun 2012 → 15 Jun 2012 |
Publication series
| Name | Proceedings of the ASME Turbo Expo |
|---|---|
| Number | PARTS A, B, AND C |
| Volume | 8 |
Abstract
This paper presents loss mechanisms associated with unsteady flows in axial turbines due to the interaction of wakes with downstream blade-rows. To evaluate the effect of wake induced loss mechanisms, extensive 3D-URANS computations of an 1.5- stage low pressure turbine rig have been performed. The investigation of the flow field shows how the wake influences wellknown effects like the negative-jet effect and resulting flow structures. A detailed view on the impact of these time-dependent flow structures on the fluctuating pressure distribution on the blade is presented by evaluation in both, the time and frequency domains. The effects causing the fluctuations are identified in detail and attributed to their corresponding sources. Unsteady pressure induced by potential effects is distinguished from unsteadiness induced by wake passage. Regarding the latter, it is shown that the amplitude of the pressure fluctuations correlates with the instantaneous state of the wake. In order to describe this behavior, an analytical model is proposed and referred to as the conservation of wake circulation. The evaluation of the entropy generation caused by wake deformation allows the distinction of different loss mechanisms. Finally, an empirical correlation between the amplitude of pressure fluctuation and loss generation is shown.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012. PARTS A, B, AND C. ed. 2013. p. 2743-2752 (Proceedings of the ASME Turbo Expo; Vol. 8, No. PARTS A, B, AND C).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Unsteady Wake-Blade Interaction
T2 - ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012
AU - Biester, Marc H.O.
AU - Henke, Michael
AU - Seume, Jörg R.
AU - Gündogdu, Yavuz
AU - Engel, Karl
PY - 2013/7/9
Y1 - 2013/7/9
N2 - This paper presents loss mechanisms associated with unsteady flows in axial turbines due to the interaction of wakes with downstream blade-rows. To evaluate the effect of wake induced loss mechanisms, extensive 3D-URANS computations of an 1.5- stage low pressure turbine rig have been performed. The investigation of the flow field shows how the wake influences wellknown effects like the negative-jet effect and resulting flow structures. A detailed view on the impact of these time-dependent flow structures on the fluctuating pressure distribution on the blade is presented by evaluation in both, the time and frequency domains. The effects causing the fluctuations are identified in detail and attributed to their corresponding sources. Unsteady pressure induced by potential effects is distinguished from unsteadiness induced by wake passage. Regarding the latter, it is shown that the amplitude of the pressure fluctuations correlates with the instantaneous state of the wake. In order to describe this behavior, an analytical model is proposed and referred to as the conservation of wake circulation. The evaluation of the entropy generation caused by wake deformation allows the distinction of different loss mechanisms. Finally, an empirical correlation between the amplitude of pressure fluctuation and loss generation is shown.
AB - This paper presents loss mechanisms associated with unsteady flows in axial turbines due to the interaction of wakes with downstream blade-rows. To evaluate the effect of wake induced loss mechanisms, extensive 3D-URANS computations of an 1.5- stage low pressure turbine rig have been performed. The investigation of the flow field shows how the wake influences wellknown effects like the negative-jet effect and resulting flow structures. A detailed view on the impact of these time-dependent flow structures on the fluctuating pressure distribution on the blade is presented by evaluation in both, the time and frequency domains. The effects causing the fluctuations are identified in detail and attributed to their corresponding sources. Unsteady pressure induced by potential effects is distinguished from unsteadiness induced by wake passage. Regarding the latter, it is shown that the amplitude of the pressure fluctuations correlates with the instantaneous state of the wake. In order to describe this behavior, an analytical model is proposed and referred to as the conservation of wake circulation. The evaluation of the entropy generation caused by wake deformation allows the distinction of different loss mechanisms. Finally, an empirical correlation between the amplitude of pressure fluctuation and loss generation is shown.
UR - http://www.scopus.com/inward/record.url?scp=84881124798&partnerID=8YFLogxK
U2 - 10.1115/GT2012-69616
DO - 10.1115/GT2012-69616
M3 - Conference contribution
AN - SCOPUS:84881124798
SN - 9780791844748
T3 - Proceedings of the ASME Turbo Expo
SP - 2743
EP - 2752
BT - ASME Turbo Expo 2012
Y2 - 11 June 2012 through 15 June 2012
ER -