Socket ring of reaction turbine

Abstract

The invention discloses a socket ring of a reaction turbine, and belongs to the technical field of turbines. The socket ring comprises an upper ring plate, a lower ring plate and multiple fixed guidevanes fixed between the upper ring plate and the lower ring plate. The socket ring is characterized in that the fixed guide vanes are provided with a tail wing, the tail wing is fixed to the middle ofthe water outlet edge of the fixed guide vanes, the tail wing is in a columnar shape, the cross section of the tail wing is in a trapezoid shape and defined by a tail wing bottom edge, a tail wing water outlet edge, a first tail wing side edge and a second tail wing side edge, the length of the tail wing bottom edge is equal to that of the water outlet edge of the fixed guide vanes, the tail wingbottom edge is parallel to the tail wing water outlet edge, and the length of the tail wing bottom edge is larger than the length of the tail wing water outlet edge. The excitation frequency of a Karman vortex street can be improved, the excitation energy of the Karman vortex street can be reduced, the fixed guide vane outlet Karman vortex street frequency and the fixed guide vane inherent frequency can be staggered, hydroelastic resonance is prevented from being produce, the fixed guide vanes are prevented from being cracked, the turbine is prevented from producing whistles, and working stability of the turbine is ensured.

Description

technical field [0001] The invention relates to the technical field of water turbines, in particular to a seat ring of an impact water turbine. Background technique [0002] The fixed guide vane of the impact turbine has two functions, one is to guide the water flow from the volute of the turbine evenly into the movable guide vane as a flow-passing part; Transfer to concrete foundation. Due to the advancement of the hydraulic design technology of the reaction turbine, the fixed guide vane designed with the latest technology rarely has the problem of hydraulic elastic resonance. However, there are two reasons why this resonance phenomenon occasionally occurs in some impact turbines that have been put into operation. First, the existing hydraulic design technology is still difficult to accurately predict the frequency of the Karman vortex street at the outlet of the fixed guide vane; second. It is due to the increase in the size of the reaction turbine and the reduction in t...

AI Technical Summary

Problems solved by technology

[0008] The frequency of the Karman vortex street at the outlet of the fixed guide vane on the seat ring is easy to coincide with the natural frequency of the fixed guide vane, resulting in hydraulic elastic resonance, resulting in cracks in the fixed guide vane, and howling noise of the entire turbine, which greatly affects the working stability of the turbine

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