A steel-concrete tower system and method for improving the aerodynamic performance of wind turbines
A technology of aerodynamic performance and wind turbine, applied in the installation/supporting configuration of wind turbines, wind power generation, engine functions, etc. Wind damage and other issues
Active Publication Date: 2018-08-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
When the blade is in the shutdown position that does not block the tower, although the interference effect of the blade on the tower can be weakened, the flow direction of the airflow is not changed, but it directly acts on the windward side of the tower, which will inevitably lead to Excessive positive pressure will cause a series of wind-induced damage problems; however, the uncontrollable stop position of the blades will not fundamentally improve the aerodynamic performance of the wind turbine system
Method used
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Embodiment 1
[0037] In this embodiment, a 3MW large-scale horizontal axis wind turbine (with a blade span length of 44.5m) is taken as an example, as figure 1 As shown, the height of the upper truss is determined according to the known blade length, and the vertical height of the truss is specified to be 6m longer than the blade. In this embodiment, a quadrangular prism truss with a height of 50m is used, and the incoming airflow can pass through the upper tower through the gap. , used to weaken the blocking effect of the tower on the airflow and the shielding effect of the blades on the tower, and reduce the self-weight of the overall structure; after the height of the lower concrete tower and the upper truss tower are determined, the lower tower is constructed, and the concrete pouring height At the position of 2m below the actual tube height; the upper truss is welded to the steel bars protruding from the lower tower and reinforced with a fixed connector 7, and the fixed connector 7 is f...
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The invention relates to a steel-mixed tower system and method for improving aerodynamic performance of a wind turbine. A tower is formed by combining a truss and a concrete tower tube. The upper portion of the tower is of a quadrangular prism structure formed by the truss, and the lower portion of the tower is of a circular table type concrete structure. The quadrangular prism structure of the truss and steel bars in concrete are connected at the joint of the quadrangular prism structure of the truss and the lower circular table type concrete structure in a welded manner. The joint of the upper portion of the truss and a cabin is fixed through a suction cup welded to the bottom of the cabin. The perpendicular length of the quadrangular prism structure of the truss is larger than the length of blades by 5 m to 10 m. The aerodynamic performance of the steel-mixed tower system is simulated through a computational fluid dynamics method and compared with un-optimized aerodynamic force data of a tower structure, and an optimal system scheme of the aerodynamic performance of a wind turbine system is finally determined; and the system remarkably reduces the self weight of the structure and can be applied to the large wind turbine system being the 8MW stage or above.
Description
technical field [0001] The invention relates to the field of building technology of wind power systems and the field of wind resistance of large towering structures, in particular to a steel-concrete tower system and method for improving the aerodynamic performance of a wind turbine. Background technique [0002] As the main structure of wind power generation, wind turbines are gradually developing towards high power, and the problem of wind-induced damage is becoming more and more prominent. The interference effect of blades on the tower is one of the important reasons for wind-induced damage. [0003] The wind turbine system is in a shutdown state under the action of strong wind, and the shutdown position of the blades will significantly affect the aerodynamic performance of the tower. Studies have shown that when the upstream blades rotate to completely coincide with the tower, the incoming flow is separated by the shielding of the blades and vortex shedding occurs on the...
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IPC IPC(8): F03D13/20G06F17/50
CPCF03D13/20F05B2240/912F05B2260/84G06F30/17Y02E10/72Y02E10/728Y02P70/50
Inventor 柯世堂徐璐王浩朱鹏杜凌云余玮余文林王晓海
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS