Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models

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JOŠT, Dragica ;ŠKERLAVAJ, Aljaž ;LIPEJ, Andrej .
Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 60, n.2, p. 124-134, june 2018. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/improvement-of-efficiency-prediction-for-a-kaplan-turbine-with-advanced-turbulence-models/>. Date accessed: 13 dec. 2018. 
doi:http://dx.doi.org/10.5545/sv-jme.2013.1222.
Jošt, D., Škerlavaj, A., & Lipej, A.
(2014).
Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models.
Strojniški vestnik - Journal of Mechanical Engineering, 60(2), 124-134.
doi:http://dx.doi.org/10.5545/sv-jme.2013.1222
@article{sv-jmesv-jme.2013.1222,
	author = {Dragica  Jošt and Aljaž  Škerlavaj and Andrej  Lipej},
	title = {Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {60},
	number = {2},
	year = {2014},
	keywords = {water turbine; Kaplan turbine; efficiency prediction; CFD; turbulence models; ZLES},
	abstract = {A comparison between numerical simulations and measurements of a six-blade Kaplan turbine is presented in order to determine an appropriate numerical setup for accurate and reliable simulations of Kaplan turbines. Values of discharge, torque and losses obtained by different turbulence models are compared to each other and to the measurements. Steady state simulations with various turbulence models tend to predict large errors at full discharge rate, which are the result of underestimated torque on the shaft and overestimated flow energy losses in the draft tube. The results were slightly improved with the curvature correction (CC) and Kato-Launder (KL) limiter of turbulence production. Transient simulations were performed with shear-stress-transport (SST) turbulence model, the scale-adaptive-simulation (SAS SST) model, and with zonal large-eddy-simulation (ZLES). Details about turbulent structures in the draft tube are illustrated in order to explain the reasons for differences in flow energy losses obtained by different turbulence models. The effects of advection schemes and mesh refinement were tested. It was shown that all of the transient simulations considerably improved results at full discharge rate. The largest improvement was achieved with the SAS SST and the ZLES models in combination with the bounded central differential scheme. In addition, it was shown that the ZLES model produced accurate results at all operating points, with discrepancy lower than 1%.},
	issn = {0039-2480},	pages = {124-134},	doi = {10.5545/sv-jme.2013.1222},
	url = {https://www.sv-jme.eu/article/improvement-of-efficiency-prediction-for-a-kaplan-turbine-with-advanced-turbulence-models/}
}
Jošt, D.,Škerlavaj, A.,Lipej, A.
2014 June 60. Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 60:2
%A Jošt, Dragica 
%A Škerlavaj, Aljaž 
%A Lipej, Andrej 
%D 2014
%T Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models
%B 2014
%9 water turbine; Kaplan turbine; efficiency prediction; CFD; turbulence models; ZLES
%! Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models
%K water turbine; Kaplan turbine; efficiency prediction; CFD; turbulence models; ZLES
%X A comparison between numerical simulations and measurements of a six-blade Kaplan turbine is presented in order to determine an appropriate numerical setup for accurate and reliable simulations of Kaplan turbines. Values of discharge, torque and losses obtained by different turbulence models are compared to each other and to the measurements. Steady state simulations with various turbulence models tend to predict large errors at full discharge rate, which are the result of underestimated torque on the shaft and overestimated flow energy losses in the draft tube. The results were slightly improved with the curvature correction (CC) and Kato-Launder (KL) limiter of turbulence production. Transient simulations were performed with shear-stress-transport (SST) turbulence model, the scale-adaptive-simulation (SAS SST) model, and with zonal large-eddy-simulation (ZLES). Details about turbulent structures in the draft tube are illustrated in order to explain the reasons for differences in flow energy losses obtained by different turbulence models. The effects of advection schemes and mesh refinement were tested. It was shown that all of the transient simulations considerably improved results at full discharge rate. The largest improvement was achieved with the SAS SST and the ZLES models in combination with the bounded central differential scheme. In addition, it was shown that the ZLES model produced accurate results at all operating points, with discrepancy lower than 1%.
%U https://www.sv-jme.eu/article/improvement-of-efficiency-prediction-for-a-kaplan-turbine-with-advanced-turbulence-models/
%0 Journal Article
%R 10.5545/sv-jme.2013.1222
%& 124
%P 11
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 60
%N 2
%@ 0039-2480
%8 2018-06-28
%7 2018-06-28
Jošt, Dragica, Aljaž  Škerlavaj, & Andrej  Lipej.
"Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models." Strojniški vestnik - Journal of Mechanical Engineering [Online], 60.2 (2014): 124-134. Web.  13 Dec. 2018
TY  - JOUR
AU  - Jošt, Dragica 
AU  - Škerlavaj, Aljaž 
AU  - Lipej, Andrej 
PY  - 2014
TI  - Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2013.1222
KW  - water turbine; Kaplan turbine; efficiency prediction; CFD; turbulence models; ZLES
N2  - A comparison between numerical simulations and measurements of a six-blade Kaplan turbine is presented in order to determine an appropriate numerical setup for accurate and reliable simulations of Kaplan turbines. Values of discharge, torque and losses obtained by different turbulence models are compared to each other and to the measurements. Steady state simulations with various turbulence models tend to predict large errors at full discharge rate, which are the result of underestimated torque on the shaft and overestimated flow energy losses in the draft tube. The results were slightly improved with the curvature correction (CC) and Kato-Launder (KL) limiter of turbulence production. Transient simulations were performed with shear-stress-transport (SST) turbulence model, the scale-adaptive-simulation (SAS SST) model, and with zonal large-eddy-simulation (ZLES). Details about turbulent structures in the draft tube are illustrated in order to explain the reasons for differences in flow energy losses obtained by different turbulence models. The effects of advection schemes and mesh refinement were tested. It was shown that all of the transient simulations considerably improved results at full discharge rate. The largest improvement was achieved with the SAS SST and the ZLES models in combination with the bounded central differential scheme. In addition, it was shown that the ZLES model produced accurate results at all operating points, with discrepancy lower than 1%.
UR  - https://www.sv-jme.eu/article/improvement-of-efficiency-prediction-for-a-kaplan-turbine-with-advanced-turbulence-models/
@article{{sv-jme}{sv-jme.2013.1222},
	author = {Jošt, D., Škerlavaj, A., Lipej, A.},
	title = {Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {60},
	number = {2},
	year = {2014},
	doi = {10.5545/sv-jme.2013.1222},
	url = {https://www.sv-jme.eu/article/improvement-of-efficiency-prediction-for-a-kaplan-turbine-with-advanced-turbulence-models/}
}
TY  - JOUR
AU  - Jošt, Dragica 
AU  - Škerlavaj, Aljaž 
AU  - Lipej, Andrej 
PY  - 2018/06/28
TI  - Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 60, No 2 (2014): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2013.1222
KW  - water turbine, Kaplan turbine, efficiency prediction, CFD, turbulence models, ZLES
N2  - A comparison between numerical simulations and measurements of a six-blade Kaplan turbine is presented in order to determine an appropriate numerical setup for accurate and reliable simulations of Kaplan turbines. Values of discharge, torque and losses obtained by different turbulence models are compared to each other and to the measurements. Steady state simulations with various turbulence models tend to predict large errors at full discharge rate, which are the result of underestimated torque on the shaft and overestimated flow energy losses in the draft tube. The results were slightly improved with the curvature correction (CC) and Kato-Launder (KL) limiter of turbulence production. Transient simulations were performed with shear-stress-transport (SST) turbulence model, the scale-adaptive-simulation (SAS SST) model, and with zonal large-eddy-simulation (ZLES). Details about turbulent structures in the draft tube are illustrated in order to explain the reasons for differences in flow energy losses obtained by different turbulence models. The effects of advection schemes and mesh refinement were tested. It was shown that all of the transient simulations considerably improved results at full discharge rate. The largest improvement was achieved with the SAS SST and the ZLES models in combination with the bounded central differential scheme. In addition, it was shown that the ZLES model produced accurate results at all operating points, with discrepancy lower than 1%.
UR  - https://www.sv-jme.eu/article/improvement-of-efficiency-prediction-for-a-kaplan-turbine-with-advanced-turbulence-models/
Jošt, Dragica, Škerlavaj, Aljaž, AND Lipej, Andrej.
"Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 60 Number 2 (28 June 2018)

Authors

Affiliations

  • Turboinštitut, Ljubljana, Slovenia
  • Turboinštitut, Ljubljana, Slovenia
  • Turboinštitut, Ljubljana, Slovenia

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 60(2014)2, 124-134

10.5545/sv-jme.2013.1222

A comparison between numerical simulations and measurements of a six-blade Kaplan turbine is presented in order to determine an appropriate numerical setup for accurate and reliable simulations of Kaplan turbines. Values of discharge, torque and losses obtained by different turbulence models are compared to each other and to the measurements. Steady state simulations with various turbulence models tend to predict large errors at full discharge rate, which are the result of underestimated torque on the shaft and overestimated flow energy losses in the draft tube. The results were slightly improved with the curvature correction (CC) and Kato-Launder (KL) limiter of turbulence production. Transient simulations were performed with shear-stress-transport (SST) turbulence model, the scale-adaptive-simulation (SAS SST) model, and with zonal large-eddy-simulation (ZLES). Details about turbulent structures in the draft tube are illustrated in order to explain the reasons for differences in flow energy losses obtained by different turbulence models. The effects of advection schemes and mesh refinement were tested. It was shown that all of the transient simulations considerably improved results at full discharge rate. The largest improvement was achieved with the SAS SST and the ZLES models in combination with the bounded central differential scheme. In addition, it was shown that the ZLES model produced accurate results at all operating points, with discrepancy lower than 1%.

water turbine; Kaplan turbine; efficiency prediction; CFD; turbulence models; ZLES