Variable-geometry turbine with adjustable static blade self-air-entraining and air-injection structures
A technology of variable geometry turbines and vanes applied to turbines. It can solve the problems of ineffective feedback of gap height changes, thermal inertia, complex structure layout, etc., and achieve good characteristics of variable working conditions, reduce gap leakage, and reduce sensitivity.
Active Publication Date: 2014-11-19
HARBIN ENG UNIV
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Problems solved by technology
The passive clearance control method mainly adopts the blade top and casing processing, such as grooved blade top, casing end wall shape, etc. Although this method can improve the performance of the turbine design point, it cannot effectively feedback the change of the clearance height
The active clearance control method mainly heats or cools the surface of the casing or the blade by drawing out the airflow of the compressor to make it expand or contract accordingly, so as to perform feedback control on the change of the clearance height, but this method has problems such as thermal inertia and complex structural arrangement.
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[0021] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0022] combine Figure 1-7 , the present invention is made up of hub 1, adjustable stationary vane 4 and casing 9, adjustable stationary vane 4 comprises blade leading edge line 5, trailing edge line 6, upper end surface 7 and lower end surface 3, the upper end surface of adjustable stationary vane The end face 7 and the lower end face 3 are provided with an upper rotating shaft 8 and a lower rotating shaft 2 respectively, the upper rotating shaft 8 is embedded in the casing 9, the lower rotating shaft 2 is embedded in the hub 1, and the axes of the upper and lower rotating shafts rotate at the same On the axis to facilitate the rotation of the adjustable vane, and the shaft diameter of the upper rotating shaft 8 is larger than that of the lower rotating shaft 2, the lower rotating shaft 2 only serves as a positioning function, between the casing 9 and the upper e...
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The invention aims to provide a variable-geometry turbine with adjustable static blade self-air-entraining and air-injection structures. The variable-geometry turbine comprises a casing, a hub and adjustable static blades, the adjustable static blades are uniformly arranged peripherally, an upper rotating shaft is arranged on the upper end face of each adjustable static blade, a lower rotating shaft is arranged on the lower end face of each adjustable static blade, the outer side of each adjustable static blade is connected with the casing through the corresponding upper rotating shaft, each lower rotating shaft is arranged in a static blade groove of the hub, an adjusting rod for adjusting angle of the corresponding adjustable static blade is mounted on each upper rotating shaft and extends to the outside of the casing, one self-air-entraining and air-injection structure is arranged in each adjustable static blade and is an air injection hole penetrating the corresponding adjustable static blade, an air entraining port of and each air injection hole is positioned in the front edge of the corresponding adjustable static blade while an air injection hole of the same is positioned in the upper end face of the corresponding adjustable static blade. Gap leakage quantity can be reduced, efficiency of the variable-geometry turbine can be improved, and sensitivity, of performance, to gap height changes during variable geometry of the turbine can be lowered.
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. 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, when the turbine vane rotates, the gap height in the end zone will change, especially in the large meridian expansion variable geometry turbine, the change speed of the gap height is more obvious, which further affects the working performance of the variable geometry turbine. ...
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Inventor 高杰郑群董平姜玉廷岳国强
Owner HARBIN ENG UNIV