Method, device and system for adjusting centrifugal water pump inlet flow field

The invention discloses a method, device and system for adjusting a centrifugal water pump inlet flow field. The method comprises the steps that data processing is carried out on collected work parameter signals, and the maximum output amplitude of the work parameter signals and the frequency generated when the amplitude is maximum are acquired; the frequency or the amplitude is used as the subordinating degree function of variables, and the membership degree of the frequency on fuzzy subsets on the discourse domain of the frequency and the membership degree of the amplitude on fuzzy subsets on the discourse domain of the amplitude are respectively acquired; the frequency membership degree and the amplitude membership degree are utilized for inquiring a preset fuzzy control table, and the membership degrees of control angles on fuzzy subsets on the discourse domains of the control angles are acquired; defuzzification is carried out on the membership degrees of the control angles to obtain the corresponding control angles; the angle of a water inlet adjusting valve is adjusted to the control angles. The work parameter signals are collected in real time, the angle of the valve is automatically adjusted according to the changes of the work parameter signals, therefore, the distribution of the water pump inlet flow field is improved, and a water pump cavitation erosion phenomenon is prevented from happening so that the performance of a water pump can be achieved completely.