...Jun Yang; Xianhua Feng; Zhenyang Liao; Kaixin Pan; Xiaohua Liu An in-depth understanding of stall behavior is essential to improve the safe and stable operation of the pump turbine. In this research, the detached eddy simulation (DES) is used to investigate the various characteristics...

...Sabri Deniz; Martin von Burg; Manuel Tiefenthaler This is the second part of a two-part paper focusing on the flow instabilities of low-specific speed pump turbines. In this part, results of the flow control application with fluid injection in the vaneless space for suppressing the flow...

...Sabri Deniz; Armando Del Rio; Martin von Burg; Manuel Tiefenthaler This is the first part of a two-part paper focusing on the flow instabilities of pump turbines. In this first part, results of the experiments and computational fluid dynamics (CFD) simulations of the research carried out on a low...

...Deyou Li; Yonglin Qin; Zhigang Zuo; Hongjie Wang; Shuhong Liu; Xianzhu Wei Pump performance characteristics of pump turbines in transient processes are significantly different from those in steady processes. In the present paper, transient processes of a flow rate that increased and decreased...

..., the no-load stability of pump turbine was analyzed by introducing step disturbance and slopes. Finally, the results indicate that the no-load operating point is easy to be disturbed and some factors, such as different disturbance intensity and slopes, have different influence on no-load stability...

... on the turbine cover was from 24 to 26 kHz, for the vibration sensor on the guide vane 36–40 kHz, for the acoustic emission sensor on the turbine cover 140–145 kHz, and for the pressure fluctuation sensor in the draft tube wall 130–150 kHz. cavitation pump turbine Thoma number cavitation estimator...

.... Editor: Edward M. Bennett. 30 07 2012 14 01 2013 For pump turbines, an S-shaped curve can lead to failures in synchronization. To improve the hydraulic design, the component that is responsible for the formation of the S-shaped curve was identified by a hydraulic loss analysis using...

...Grunde Olimstad; Torbjørn Nielsen; Bjarne Børresen Measurements have been performed on a reversible-pump turbine model installed in a closed loop conduit system. The characteristics of the unstable pump turbine in turbine mode show a hysteresis pattern. Hence the output of the system is dependent...

...C. G. Rodriguez; E. Egusquiza; I. F. Santos The highest vibration levels in large pump turbines are, in general, originated in the rotor stator interaction (RSI). This vibration has specific characteristics that can be clearly observed in the frequency domain: harmonics of the moving blade passing...