A variable geometry turbine comprising adjustable vanes with grooved winglet structures at the blade ends

A technology of variable geometry turbine and wing structure applied to turbines. It can solve problems such as affecting turbine efficiency, stator vane leakage loss, and adjustable stator vane failure, and achieve the effects of increasing gap leakage flow resistance, avoiding stress peaks, and facilitating processing and engineering applications.
CN104153822BActive Publication Date: 2015-09-30HARBIN ENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN ENG UNIV
Publication Date
2015-09-30

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Abstract

The invention provides a variable-geometry turbine comprising adjustable stationary blades with groove-shaped small wing structures at leaf ends. The variable-geometry turbine comprises a box, a hub and the adjustable stationary blades, wherein the adjustable stationary blades are uniformly arranged along the peripheral direction of the hub; an upper rotating shaft is arranged on the upper end surface of each adjustable stationary blade; a lower rotating shaft is arranged on the lower end surface of each adjustable stationary blade; the outer side of each adjustable stationary blade is connected with the box through the upper rotating shaft of the adjustable stationary blade; the hub is provided with stationary blade grooves; the lower rotating shafts are arranged in the stationary blade grooves; each upper rotating shaft is provided with an adjusting rod capable of adjusting the angle of the corresponding adjustable stationary blade; the adjusting rods extend out of the box; small wing structures are respectively arranged on the upper end surface and the lower end surface of each adjustable stationary blade; the small wing structure of the upper end surface of each adjustable stationary blade comprises a front groove and a rear groove which are formed by using the corresponding upper rotating shaft as a boundary and are surrounded by ribs; and the small wing structure of the lower end surface of each adjustable stationary blade comprises a front groove and a rear groove which are formed by using the corresponding lower rotating shaft as a boundary and are surrounded by ribs. The pneumatic efficiency of the variable-geometry turbine can be effectively improved; and the work reliability is high.
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Description

technical field

[0001] The invention relates to a turbine of a gas turbine. Background technique

[0002] Gas turbines often operate at off-design conditions, where turbine efficiency is significantly reduced. Variable geometry turbine technology can effectively improve the efficiency of gas turbines in variable working conditions, and adjusting the installation angle of turbine vanes is an effective variable geometry method.

[0003] In the adjustable vane structure of the prior art, in order to ensure that the turbine vane can rotate, there must be a gap between the upper and lower end walls of the vane, which causes leakage loss of the vane and seriously affects the efficiency of the turbine. In addition, there is often a risk of overstress at the connection between the adjustable vane itself and the upper and lower rotating shafts, resulting in failure of the adjustable vane. Due to the deficiencies of the prior art, people hope to have a variable geometry turbine that...

Claims

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