Data from: Effect of valve opening on starting performance of pump as turbine

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.