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CN-121993343-A - Breeze power generation turbine flow guiding fan

CN121993343ACN 121993343 ACN121993343 ACN 121993343ACN-121993343-A

Abstract

The invention discloses a breeze power generation turbine flow guiding fan, which relates to the technical field of wind power generation and comprises a frame 1 and a plurality of fan blades 2 which are annularly arranged and connected with the frame, wherein the fan blades 2 are provided with a plurality of flow guiding bodies 3, the geometric shapes of the flow guiding bodies 3 are concave-convex structures formed by the inner wall and the outer wall and have the same embryo equivalent shapes of direction-preserving mapping, each flow guiding body 3 accords with the shape of a topological invariant, the plurality of flow guiding bodies 3 are arrayed along the extending direction or/and the chord direction of the fan blades 2 to form a continuous flow, the flow guiding bodies 3 adopt a closed curved surface structure without a deficiency and a boundary, and a continuous flow field channel is formed through the concave-convex nested design of the inner wall and the outer wall. The structure realizes topological equivalence with the two-dimensional disc through direction preserving mapping, and ensures that geometric invariance is maintained under different attack angle working conditions.

Inventors

  • ZHANG LIMING
  • XU XIANFU

Assignees

  • 中微能(苏州)机电有限公司

Dates

Publication Date
20260508
Application Date
20260323

Claims (10)

  1. 1. The breeze power generation turbine diversion fan comprises a frame (1) and a plurality of fan blades (2) connected with the frame, and is characterized in that a plurality of diversion bodies (3) are arranged on the fan blades (2); the geometric shape of the flow guide body (3) is that the inner wall and the outer wall form a concave-convex structure and have the shape of the same embryo equivalence class of direction-preserving mapping; each guide body (3) is in a shape conforming to a topological invariant; the plurality of flow directors (3) are arranged in an array along the expanding direction or the chord direction of the fan blade (2) to form a continuous flow.
  2. 2. The breeze power generation turbine guide fan according to claim 1, wherein the array type arrangement is a rectangular array.
  3. 3. The breeze power generation turbine diversion fan according to claim 1, wherein the array type arrangement is trapezoidal, the trapezoidal arrangement is sparsely arranged in an end area of the fan blade (2), and the trapezoidal arrangement is densely arranged in a root area of the fan blade (2).
  4. 4. The breeze power generation turbine guide fan according to claim 3, wherein the array arrangement is arranged on the outer surface of the fan blade (2) in a rotationally symmetrical topology, so that the included angle between the hole axis and the chord line of each guide body (3) forms a shape of topological equivalence class for optimizing the local lift-drag ratio in the attack angle change area of the fan blade (2).
  5. 5. The breeze power generation turbine guide fan as set forth in claim 4, wherein the shape of the continuous flow conforms to the constraint that if the continuous flow has homoembryo h M.fwdarw.N such that for any x.epsilon.M, h map the trajectory of φ over x.epsilon.M onto the trajectory of ψover h (x) e.N in a direction preserving manner.
  6. 6. The breeze power generation turbine guide fan according to claim 1, wherein the guide body (3) is shaped to meet zero deficiency and boundless.
  7. 7. The breeze power generation turbine guide fan according to claim 6, wherein the guide body (3) is shaped like a two-dimensional disc, and any focal point connecting line is in line with axial symmetry.
  8. 8. The breeze power generation turbine guide fan according to claim 6, wherein the shape of the guide body (3) is a ring handle topological shaped structure, and the ring handle topological genus is a closed curved surface of 1.
  9. 9. The breeze power generation turbine guide fan according to claim 1, 2,3 or 6, wherein the straight line connection point of each fan blade (2) and the frame (1), and the included angle of any two fan blades (2) are arranged modes formed based on the optimal solution of wind resistance found in the following models: r i =(rcosθ i ,rsinθ i ,z i ); Wherein r i is the three-dimensional coordinate of the connecting point of the ith fan blade (2), r is the radius of the fan blade (2), θ i is the azimuth angle of the connecting point, and z i is the axial position of the connecting point.
  10. 10. The breeze power generation turbine diversion fan according to claim 9, wherein the included angle alpha ij of any two fan blades (2) is a topological invariant, and the relationship between the included angle alpha ij and the power is determined based on the Betz limit: α ij =arccos（n i n j /∥n i ∥ ∥n j ∥); Wherein n i and n j are normal vectors of the fan blade (2).

Description

Breeze power generation turbine flow guiding fan Technical Field The invention relates to the technical field of wind power generation, in particular to a wind turbine diversion structure and arrangement design based on topological optimization and wind-air dynamics cooperation, and particularly relates to a breeze power generation turbine diversion fan. Background In the field of wind energy conversion, wind power generation occupies a key position, and the design optimization and performance improvement of a core component, namely a wind turbine blade, are one of core elements [1] for improving energy conversion efficiency. In order to improve the operation efficiency and durability of the wind generating set, systematic researches are developed in academia and industry aiming at the blade diversion structure and the blade arrangement mode. The blade flow directing structure particularly refers to an auxiliary aerodynamic device mounted on the blade surface, blade root or blade tip region, including vortex generators (Vortex Generators, VGs), winglets (winglets) and other flow field regulating and controlling components [2-7]. The vortex generator effectively improves aerodynamic performance [2,4,7] by delaying boundary layer separation of the inner section of the blade, and the winglet achieves efficiency improvement [3,5] by reducing tip vortex loss and expanding the swept area of the rotor. For example, curved wing tip winglet designs exhibit enhancements [5] to unit performance under both static and oscillatory conditions. On the scale of a wind farm, blade arrangement optimization focuses on the design of unit spacing and space layout, and aims to reduce wake interference loss and improve total power generation amount [8,9] of the whole farm. The layout of the Floating Offshore Wind Turbine (FOWT) is more comprehensive in consideration of wind-wave-current coupling load effect [10,11]. The cooperative optimization of the flow guiding structure and the arrangement mode aims at improving the performance of the unit in multiple dimensions. Through the accurate pneumatic control technology, flow separation delay, wake vortex intensity inhibition and tip leakage flow improvement can be realized, so that the power coefficient (Cp) is improved, and the low wind speed starting characteristic [2,4,11-14] is optimized. For example, vortex generators significantly increase the blade lift-drag ratio [2,4,7] by stimulating small scale vortices at the blade surface, causing the separation point to move backward, maintaining lift and reducing drag at high angles of attack. For Vertical Axis Wind Turbines (VAWTs), boundary layer suction slot (MBLSS) technology is proposed to regulate blade surface flow fields, improve aerodynamic properties [15], and the dual baffle design demonstrates that the performance [16] of the H-Darrieus vertical axis unit can be improved. In addition, the predictive active flow control method exhibits application potential [17] in terms of relieving fatigue load and improving power generation. The offshore wind farm layout optimization may also enhance structural safety and energy conversion efficiency [8]. However, the current diversion structure design still has technical bottlenecks. Most schemes adopt simple geometric configurations [2,4,18] such as two-dimensional straight-sheet type guide plates or axial parallel guide grooves, and geometric parameters (such as height, inclination angle and installation position) are determined [2,16,19] based on rule of thumb or finite parameter research. For example, some studies have discussed the effect [20] of baffle geometry on the runner performance of Savonius turbines, and other work has evaluated the double baffle geometry effect [16] by CFD modeling. While these methods can partially improve aerodynamic performance, they lack complete modeling [2,11,22] of the three-dimensional unsteady turbulent flow field coupled response to blade rotation effects. This defect results in the problem [17] that under high turbulence, wind shear, or yaw conditions, the flow control effect may be significantly attenuated and localized stall or noise surge may be easily induced. For example, although nonlinear unsteady aerodynamic load generated by dynamic stall can be inhibited by the vortex generator, the influence of key parameters still needs to be studied [7], and complicated aerodynamic problems [1,22] such as tip loss and three-dimensional flow loss are difficult to completely solve by a simple flow guiding structure. Therefore, the development of the blade guide structure with specific topological form and the cooperative arrangement mode among units has important engineering value and strategic significance for breaking through the bottleneck of the traditional pneumatic performance and realizing the cooperative optimization of high robustness and low noise. Therefore, the invention provides a breeze power generation turbine diversion fan. The literat