Zuchao Zhu

TL;DR: In this paper, the authors analyzed the cavitating flow at a normal flow rate using torsion flow analysis and showed that cavitation is a challenging flow abnormality that leads to undesirable effects on the hydraulic behavior of centrifugal pumps.

TL;DR: An experimental investigation based on particle image velocimetry (PIV) technology was used to measure the internal flow in a low-specific-speed centrifugal pump impeller as mentioned in this paper.

TL;DR: In this article, the influence of opening and closing process on the external transient performance and the internal flow characteristics of ball valve under different opening and closed time was investigated and the results showed that external transient performances and flow field of the ball valve have obvious difference between the opening and the closing process as the fluid lags behind the change of relative opening.

TL;DR: In this article, a theoretical method based on the impeller-volute matching principle was proposed to predict the best efficiency point of the pump as turbine (PAT) and validated by three centrifugal pumps with specific speeds from 58.7 to 129.6 with an error of less than 5%.

TL;DR: In this paper, the authors investigated the variation of hydraulic losses based on the relationship between velocity distribution and entropy generation fields, and found that the losses mainly focused on the blade suction surface and volute tongue, as well as in the region of the volute discharge at high flow rates.