Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the ASME Turbo Expo 2007 - Power for Land, Sea, and Air |
| Pages | 563-574 |
| Number of pages | 12 |
| Publication status | Published - 3 Oct 2009 |
| Event | 2007 ASME Turbo Expo - Montreal, Que., Canada Duration: 14 May 2007 → 17 May 2007 |
Publication series
| Name | Proceedings of the ASME Turbo Expo |
|---|---|
| Volume | 6 PART A |
Abstract
Modern power plants face increasing problems with windage effects in high pressure steam turbines, due to the bigger size of the rotor blades and a more flexible demand of the electricity market, which may lead to more frequent operation at low-flow conditions. So far, no theoretical model exists to fully describe these flow phenomena which would help to prevent an overheating of the turbine blades and minimize the risk of damage. The main goal of this research project therefore is to predict the part-load behavior. Measurements of the flow field of a four-stage research air turbine were carried out at low Mach numbers to better understand the aerodynamic characteristics and the flow mechanisms at part-load. The experimental data such as temperature, pressure, velocity, and flow angles, measured in 6 different planes along the turbine annulus for different rotational speeds and different relative mass flows, have been compared with the numerical results of the CFD-solver TRACE. To obtain more realistic results than in computations published earlier, a newly generated finer grid and an extension of the computational domain at the outlet were used. It is shown that with the right initialization, the CFD-Solver is capable of providing converged calculation results even for low mass flows and high rotational speeds. The results are verified with experimental data e.g. by the temperature distribution within the four-stage turbine and the pressure and temperature profiles in the measurement planes. As a general result, the highest temperatures in the turbine do not occur behind the last stage, but in the downstream third of the machine, which agrees with experiences of damage observed in real turbines.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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Proceedings of the ASME Turbo Expo 2007 - Power for Land, Sea, and Air. 2009. p. 563-574 (Proceedings of the ASME Turbo Expo; Vol. 6 PART A).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Verification of Low-Flow Conditions in a Multistage Turbine
AU - Herzog, Nils
AU - Binner, M.
AU - Seume, J. R.
AU - Rothe, K.
PY - 2009/10/3
Y1 - 2009/10/3
N2 - Modern power plants face increasing problems with windage effects in high pressure steam turbines, due to the bigger size of the rotor blades and a more flexible demand of the electricity market, which may lead to more frequent operation at low-flow conditions. So far, no theoretical model exists to fully describe these flow phenomena which would help to prevent an overheating of the turbine blades and minimize the risk of damage. The main goal of this research project therefore is to predict the part-load behavior. Measurements of the flow field of a four-stage research air turbine were carried out at low Mach numbers to better understand the aerodynamic characteristics and the flow mechanisms at part-load. The experimental data such as temperature, pressure, velocity, and flow angles, measured in 6 different planes along the turbine annulus for different rotational speeds and different relative mass flows, have been compared with the numerical results of the CFD-solver TRACE. To obtain more realistic results than in computations published earlier, a newly generated finer grid and an extension of the computational domain at the outlet were used. It is shown that with the right initialization, the CFD-Solver is capable of providing converged calculation results even for low mass flows and high rotational speeds. The results are verified with experimental data e.g. by the temperature distribution within the four-stage turbine and the pressure and temperature profiles in the measurement planes. As a general result, the highest temperatures in the turbine do not occur behind the last stage, but in the downstream third of the machine, which agrees with experiences of damage observed in real turbines.
AB - Modern power plants face increasing problems with windage effects in high pressure steam turbines, due to the bigger size of the rotor blades and a more flexible demand of the electricity market, which may lead to more frequent operation at low-flow conditions. So far, no theoretical model exists to fully describe these flow phenomena which would help to prevent an overheating of the turbine blades and minimize the risk of damage. The main goal of this research project therefore is to predict the part-load behavior. Measurements of the flow field of a four-stage research air turbine were carried out at low Mach numbers to better understand the aerodynamic characteristics and the flow mechanisms at part-load. The experimental data such as temperature, pressure, velocity, and flow angles, measured in 6 different planes along the turbine annulus for different rotational speeds and different relative mass flows, have been compared with the numerical results of the CFD-solver TRACE. To obtain more realistic results than in computations published earlier, a newly generated finer grid and an extension of the computational domain at the outlet were used. It is shown that with the right initialization, the CFD-Solver is capable of providing converged calculation results even for low mass flows and high rotational speeds. The results are verified with experimental data e.g. by the temperature distribution within the four-stage turbine and the pressure and temperature profiles in the measurement planes. As a general result, the highest temperatures in the turbine do not occur behind the last stage, but in the downstream third of the machine, which agrees with experiences of damage observed in real turbines.
UR - http://www.scopus.com/inward/record.url?scp=34548774023&partnerID=8YFLogxK
U2 - 10.1115/GT2007-27328
DO - 10.1115/GT2007-27328
M3 - Conference contribution
AN - SCOPUS:34548774023
SN - 079184790X
SN - 9780791847909
T3 - Proceedings of the ASME Turbo Expo
SP - 563
EP - 574
BT - Proceedings of the ASME Turbo Expo 2007 - Power for Land, Sea, and Air
T2 - 2007 ASME Turbo Expo
Y2 - 14 May 2007 through 17 May 2007
ER -