GILJEN, Zdravko ;NEDELJKOVIĆ, Miloš ;CHENG, Yongguang . The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes. Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 70, n.5-6, p. 231-246, january 2024. ISSN 0039-2480. Available at: <https://www.sv-jme.eu/sl/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/>. Date accessed: 20 dec. 2024. doi:http://dx.doi.org/10.5545/sv-jme.2023.776.
Giljen, Z., Nedeljković, M., & Cheng, Y. (2024). The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes. Strojniški vestnik - Journal of Mechanical Engineering, 70(5-6), 231-246. doi:http://dx.doi.org/10.5545/sv-jme.2023.776
@article{sv-jmesv-jme.2023.776,
author = {Zdravko Giljen and Miloš Nedeljković and Yongguang Cheng},
title = {The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes},
journal = {Strojniški vestnik - Journal of Mechanical Engineering},
volume = {70},
number = {5-6},
year = {2024},
keywords = {hydraulic transients; pump-turbine; influence of the specific speed; load rejection; working point trajectory; method of characteristics; },
abstract = {The main porpose of this paper is to perform and present at transient process analysis on the influence of different specific speeds (nq) of the three-model pump-turbines that may implemented at the hydropower pump storage plant (HPSP) Bajina Basta, Serbia. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which creates difficulties in calculations during the load-rejection process. These problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of this research is the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (the head and momentum parameters (Wh and Wm), in dependence of angle (θ)) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, nq = 38 and nq = 50). These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied to the test case at HPSP. This is especially relevant when dealing with characteristic S-shaped curves that may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 and n11) trajectories of the operating points, where the unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone.},
issn = {0039-2480}, pages = {231-246}, doi = {10.5545/sv-jme.2023.776},
url = {https://www.sv-jme.eu/sl/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/}
}
Giljen, Z.,Nedeljković, M.,Cheng, Y. 2024 January 70. The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 70:5-6
%A Giljen, Zdravko %A Nedeljković, Miloš %A Cheng, Yongguang %D 2024 %T The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes %B 2024 %9 hydraulic transients; pump-turbine; influence of the specific speed; load rejection; working point trajectory; method of characteristics; %! The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes %K hydraulic transients; pump-turbine; influence of the specific speed; load rejection; working point trajectory; method of characteristics; %X The main porpose of this paper is to perform and present at transient process analysis on the influence of different specific speeds (nq) of the three-model pump-turbines that may implemented at the hydropower pump storage plant (HPSP) Bajina Basta, Serbia. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which creates difficulties in calculations during the load-rejection process. These problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of this research is the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (the head and momentum parameters (Wh and Wm), in dependence of angle (θ)) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, nq = 38 and nq = 50). These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied to the test case at HPSP. This is especially relevant when dealing with characteristic S-shaped curves that may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 and n11) trajectories of the operating points, where the unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone. %U https://www.sv-jme.eu/sl/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/ %0 Journal Article %R 10.5545/sv-jme.2023.776 %& 231 %P 16 %J Strojniški vestnik - Journal of Mechanical Engineering %V 70 %N 5-6 %@ 0039-2480 %8 2024-01-24 %7 2024-01-24
Giljen, Zdravko, Miloš Nedeljković, & Yongguang Cheng. "The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes." Strojniški vestnik - Journal of Mechanical Engineering [Online], 70.5-6 (2024): 231-246. Web. 20 Dec. 2024
TY - JOUR AU - Giljen, Zdravko AU - Nedeljković, Miloš AU - Cheng, Yongguang PY - 2024 TI - The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes JF - Strojniški vestnik - Journal of Mechanical Engineering DO - 10.5545/sv-jme.2023.776 KW - hydraulic transients; pump-turbine; influence of the specific speed; load rejection; working point trajectory; method of characteristics; N2 - The main porpose of this paper is to perform and present at transient process analysis on the influence of different specific speeds (nq) of the three-model pump-turbines that may implemented at the hydropower pump storage plant (HPSP) Bajina Basta, Serbia. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which creates difficulties in calculations during the load-rejection process. These problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of this research is the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (the head and momentum parameters (Wh and Wm), in dependence of angle (θ)) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, nq = 38 and nq = 50). These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied to the test case at HPSP. This is especially relevant when dealing with characteristic S-shaped curves that may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 and n11) trajectories of the operating points, where the unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone. UR - https://www.sv-jme.eu/sl/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/
@article{{sv-jme}{sv-jme.2023.776},
author = {Giljen, Z., Nedeljković, M., Cheng, Y.},
title = {The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes},
journal = {Strojniški vestnik - Journal of Mechanical Engineering},
volume = {70},
number = {5-6},
year = {2024},
doi = {10.5545/sv-jme.2023.776},
url = {https://www.sv-jme.eu/sl/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/}
}
TY - JOUR AU - Giljen, Zdravko AU - Nedeljković, Miloš AU - Cheng, Yongguang PY - 2024/01/24 TI - The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes JF - Strojniški vestnik - Journal of Mechanical Engineering; Vol 70, No 5-6 (2024): Strojniški vestnik - Journal of Mechanical Engineering DO - 10.5545/sv-jme.2023.776 KW - hydraulic transients, pump-turbine, influence of the specific speed, load rejection, working point trajectory, method of characteristics, N2 - The main porpose of this paper is to perform and present at transient process analysis on the influence of different specific speeds (nq) of the three-model pump-turbines that may implemented at the hydropower pump storage plant (HPSP) Bajina Basta, Serbia. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which creates difficulties in calculations during the load-rejection process. These problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of this research is the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (the head and momentum parameters (Wh and Wm), in dependence of angle (θ)) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, nq = 38 and nq = 50). These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied to the test case at HPSP. This is especially relevant when dealing with characteristic S-shaped curves that may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 and n11) trajectories of the operating points, where the unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone. UR - https://www.sv-jme.eu/sl/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/
Giljen, Zdravko, Nedeljković, Miloš, AND Cheng, Yongguang. "The Influence of Pump-Turbine Specific Speed on Hydraulic Transient Processes" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 70 Number 5-6 (24 January 2024)
Strojniški vestnik - Journal of Mechanical Engineering 70(2024)5-6, 231-246
© The Authors 2024. CC BY 4.0 Int.
The main porpose of this paper is to perform and present at transient process analysis on the influence of different specific speeds (nq) of the three-model pump-turbines that may implemented at the hydropower pump storage plant (HPSP) Bajina Basta, Serbia. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which creates difficulties in calculations during the load-rejection process. These problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of this research is the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (the head and momentum parameters (Wh and Wm), in dependence of angle (θ)) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, nq = 38 and nq = 50). These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied to the test case at HPSP. This is especially relevant when dealing with characteristic S-shaped curves that may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 and n11) trajectories of the operating points, where the unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone.