Impeller of hydraulic turbine and forward design method of impeller

Abstract

The invention discloses an impeller of a hydraulic turbine and a forward design method thereof, and the method comprises the following steps: (1) dividing an impeller blade into a front end and a rear end in the extension direction from an inlet to an outlet of the impeller; the angle formed when the front end is placed is an inlet placing angle, namely an inlet torsion angle; the angle formed when the rear end is placed is an outlet placing angle, namely an outlet torsion angle; (2) calculating an inlet torsion angle and an outlet torsion angle of an impeller matched with the outflow of the volute according to the shape of the volute and the flowing law of the outflow by taking the performance of the hydraulic turbine as an optimization target; (3) according to the working condition of the hydraulic turbine, the inlet torsion angle and the outlet torsion angle are inspected and corrected; and (4) determining a torsion angle change rule in the streamline direction of the impeller blade and the overflowing interface direction of the vertical streamline according to a positive and negative problem iteration principle. By optimizing the inlet torsion angle of the impeller blade, the turbine energy characteristic is improved, and the existing pressure energy utilization rate is increased.

Description

Technical field [0001] The present invention relates to the field of impymechanic technology, in particular to a hydraulic turbine impeller and a forward design method thereof. Background [0002] Pumps are reversible rotating machinery, pumps used as turbines in reverse are called Pump As Turbine (PAT), and pump turbines are a type of hydraulic turbine or hydraulic turbine. When the pump is running in the forward direction, the low-pressure liquid enters the impeller from the suction port, the impeller rotates to work on the liquid, the rotating machinery of the pump shaft can be converted into the pressure energy and kinetic energy of the liquid, the volute collects the high-speed fluid and further converts the kinetic energy of the liquid into pressure energy, and the high-pressure fluid is discharged from the snail outlet position. The internal flow direction of the pump is opposite to the flow direction of the pump when the pump is running in reverse, the high-pressure liqui...

AI Technical Summary

Problems solved by technology

[0006] The existing impeller design technology mainly improves the performance of the turbine by optimizing the shape of the blade, adding guide vanes and rounding the impeller, and rarely proposes to redesign the special impeller for hydraulic turbines to significantly improve the performance of the turbine

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