A two-way tubular water turbine with a sawtooth-shaped runner chamber

Abstract

The invention discloses a two-way tubular water turbine with a runner chamber in a zigzag structure, comprising a water inlet pipe, a runner chamber, and a draft pipe connected in sequence, movable guide vanes are sequentially arranged on the central axis of the water inlet pipe along the water flow direction, The movable guide vane is connected with a runner, and the runner is located in the runner chamber, and a plurality of sequentially connected zigzag guide plates are arranged on the inner wall of the runner chamber. By setting a sawtooth-shaped guide plate on the wall of the runner chamber, the axial velocity of the flow in the gap between the runner and the runner chamber can be reduced, thereby reducing the backward gap leakage flow, and at the same time weakening the tip leakage vortex that falls off from the trailing edge of the blade. And the strength of the separation vortex on the tip of the blade separated from the hub not only improves the flow state at the gap to a certain extent, but also reduces the hydraulic loss.

Description

technical field [0001] The invention belongs to the technical field of fluid mechanical equipment, and in particular relates to a two-way tubular water turbine with a sawtooth-shaped runner chamber. Background technique [0002] The two-way tubular turbine is an ideal power generation device for utilizing low head water resources. It has two power generation conditions, forward and reverse, and its performance, safety and stability are very important. However, there is generally a gap between the runner blade top of the bidirectional tubular turbine and the inner wall of the runner, and the flow phenomenon near the gap is very complicated. This flow phenomenon not only involves the backward leakage flow, blade tip leakage vortex and blade tip separation vortex to increase flow loss and deteriorate performance, but also induces cavitation, vibration and noise of the runner blades, thereby affecting the safety and stability of the two-way tubular turbine. run. In order to re...

AI Technical Summary

Problems solved by technology

However, there is generally a gap between the runner blade top of the bidirectional tubular turbine and the inner wall of the runner, and the flow phenomenon near the gap is very complicated.

This flow phenomenon not only involves backward leakage flow, blade tip leakage vortex and blade tip separation vortex to increase flow loss and deteriorate performance, but also induces cavitation, vibration and noise of runner blades, which affects the safety and stability of bidirectional tubular turbines. run

In order to reduce the flow loss caused by the blade tip gap, scholars have taken some measures such as adding skirts, drilling holes, and slotting on the blade to improve the flow state near the gap, but all of them have certain damage to the blade itself and affect its performance. Efficiency and service life, and only limited to a certain direction of water flow

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