Through-flow turbine device with bent groove

Abstract

The tubular turbine device with the bent grooves comprises a hub, a plurality of blades are fixedly connected to the outer wall of the hub in the circumferential direction of the hub, the bent grooves are formed in the surface of each blade, the bent grooves are formed in the gap sides, close to the inner wall of a runner chamber, of the blades, and the bent grooves are formed in the edges of the blades. The bent grooves are formed, so that fluid enters the grooves, small groove leakage vortexes are formed near the blade gap leakage vortex primary positions, on one hand, the primary strength of the gap leakage vortexes can be remarkably reduced, the main gap leakage vortexes are restrained, and the influence range of gap leakage flowing is reduced; and on the other hand, the arrangement of the bent grooves can reduce the flowing speed of flowing at the gap position, so that the pressure at the gap position is improved, the generation of a low-pressure area is inhibited, and the phenomena of pressure pulsation and blade top gap cavitation caused by leakage vortex are effectively solved. The forming method of the structure is simple, the requirement for the processing method of the technology is low, the bent groove can be simply formed in the gap position of an existing blade and a new blade, and the implementation cost is low.

Description

technical field [0001] The invention belongs to the technical field of fluid equipment, in particular to a tubular water turbine device with curved grooves. Background technique [0002] Gap flow widely exists in hydraulic turbines. Due to the large pressure on both sides of the gap between the device and the outer wall, the gap size is small, the resulting high-velocity gap flow will lead to the generation of gap leakage vortices, and its existence will lead to the flow stability of the gap position. Poor, the flow passes through a small-scale gap at a large flow rate. Due to the release of the pressure and being entrained by the mainstream, the top flow will roll towards the direction of the device, thereby forming a high-speed vortex. On the one hand, the vortex lacks stability, and the unstable flow will Strong pressure pulsation is generated, which makes the overall flow unstable. On the other hand, a high flow rate will generate a low pressure area at the tip clearanc...

AI Technical Summary

Problems solved by technology

When cavitation occurs violently, the violent collapse process of a large number of cavitations will cause severe vibration in the runner chamber, which will affect the stable operation of the entire unit, affect the overall efficiency of the turbine, and greatly increase the maintenance cost of the turbine

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