The acceleration effect of pump as turbine system during starting period

Zhang, Yuliang; Li, Jin-Fu; Zhu, Zuchao

doi:10.1038/s41598-023-31899-9

Cited by 5 publications

(5 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The difference among the three power curves would be more significant with the flow rate increase. This change tendency is consistent with the existing literature [19,26].…”

Section: Steady Performancesupporting

confidence: 93%

Effect of valve opening on starting performance of pump as turbine

Zhang,

Li,

Zheng

2023

PLoS ONE

View full text Add to dashboard Cite

The study on transient characteristics of pump as turbines during atypical startup has not been deeply explored yet. In order to reveal the transient characteristics of a small centrifugal pump reversing as turbine during startup process in this paper, the transient hydraulic performance experiments are conducted for three steady rotational speed cases. Under the condition of each case, three, five and, three valve opening scenarios are completed to measure the performance. The dimensionless analysis are also employed so as to better reveal transient behavior of the pump as turbine during atypical startup. The results show that the rise rate of each performance parameter is different, wherein the shaft power and rotational speed have the fastest rising rate, followed by the flow rate, and the head rise is the slowest. It is clearly seen that the shock phenomenon in static pressure easily occurs at the outlet of pump as turbine. With the increase of valve opening, the dimensionless flow rate, head and, power coefficient all show the evolution trend of gradually increasing.

show abstract

“…The difference among the three power curves would be more significant with the flow rate increase. This change tendency is consistent with the existing literature [19,26].…”

Section: Steady Performancesupporting

confidence: 93%

Effect of valve opening on starting performance of pump as turbine

Zhang,

Li,

Zheng

2023

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…We separately examined the operating points at 50% and 100% loads, whose signals and spectrum are shown in Figure 5. The pressure coefficient, C p , here is specified as Equation ( 4) [33]. The p − p indicates the removal of the DC component from the original pressure signal.…”

Section: Field Test Results Of Pressure Fluctuationmentioning

confidence: 99%

Numerical Investigation of Inner Flow Characteristics of a Prototype Pump Turbine with a Single Pier in Draft Tube at Part Load Conditions

Hu,

Xia,

Song

et al. 2023

Water

View full text Add to dashboard Cite

Pump turbines operate under various off-design conditions, resulting in complex internal flow patterns. This study employs Reynolds-averaged Navier–Stokes (RANS) numerical methods to investigate the flow characteristics of a prototype pump turbine with a single draft tube pier in turbine mode, and then, the flow characteristics inside the draft tube are discussed with emphasis. Asymmetry between the pier-divided draft tube passage flows is inevitable due to the elbow section’s curvature. Most of the fluid flows out of one passage, while vortex motion dominates the interior of the other one, resulting in completely different pressure fluctuation characteristics for the two flow passages. The large-flow passage is mainly characterized by the wide band in the frequency domain, corresponding to the recirculation zone, while some of the measured points in the low-discharge passage exhibit frequency splitting under kinematic progression. Further analysis demonstrates a low-frequency peak corresponding to the complementary shape between the vortex rope and the recirculation zone. This work elucidates the effects of the pier on the flow behavior and pressure fluctuation characteristics inside the draft tube and fills the research gap on piers in the field of pump turbines.

show abstract

“…This approach is instrumental in identifying and analyzing areas where vortices signi cantly in uence ow behavior. By prioritizing the assessment of vortex strength, the Q criterion offers valuable insights into the intricate ow patterns and characteristics of centrifugal pumps [23]. In this context, Fig.…”

Section: Resultsmentioning

confidence: 99%

Numerical Investigation of Double-Volute Balancing in Centrifugal Pumps

Kibar,

Yigit

2023

Preprint

View full text Add to dashboard Cite

This study investigates the impact of radial hydraulic forces on centrifugal pump bearings and assesses the effectiveness of the double-volute balancing technique in mitigating these forces. Numerical simulations were conducted on centrifugal pumps with both single- and double-volute configurations while ensuring extended computational domains in the inlet and outlet sections for improved flow characteristics. Experimental validation was performed to validate the numerical findings and provide additional evidence of the efficiency of the technique used in the simulations. The simulations demonstrated a notable decrease in the radial hydraulic forces with the implementation of the double-volute configuration. The pressure differentials between the single- and double-volutes played a critical role in counteracting the unbalanced forces generated by the impeller. Consequently, adopting a double-volute centrifugal pump design resulted in a substantial reduction in impeller-induced forces and the forces exerted on the bearings, resulting in an approximate 50% decrease in radial forces.

show abstract

The acceleration effect of pump as turbine system during starting period

Cited by 5 publications

References 34 publications

Effect of valve opening on starting performance of pump as turbine

Effect of valve opening on starting performance of pump as turbine

Numerical Investigation of Inner Flow Characteristics of a Prototype Pump Turbine with a Single Pier in Draft Tube at Part Load Conditions

Numerical Investigation of Double-Volute Balancing in Centrifugal Pumps

Contact Info

Product

Resources

About