Design Simulation And Testing Of Impellers For Small Axial Flow Wind Power Equipment

With the shortage of traditional energy and the aggravation of environmental pollution,the development and utilization of new energy are of great significance.As a new type of clean energy,wind energy has been highly valued.The use of wind energy is no longer limited to the use of natural wind energy,there are a lot of mechanical wind energy was wasted in industrial,manufacturing and mining.Small wind power plants could be placed in industrial ventilation ducts and mine vents,and mechanical wind energy could be recycled and stored for lighting or other purposes.In order to better simulate mechanical wind flow field within the limited space,this article aims at the existing electric sweep road car on the market,according to the requirements of the vehicle space,the air volume at the outlet of the centrifugal fan is recycled without affecting the performance of the electric sanitation vehicle a small axial flow wind power generation device was designed,the 3kw small horizontal axis wind turbine was used as the research object,it was placed in a circular wind duct,the stable air simulation was created by using the sanitation car 300*600 specifications of the high pressure centrifugal fan the changes in flow field and power generation were explored.Simulation analysis and numerical simulation were carried out to verify the feasibility of small axial wind power generation device.The main contents of this paper are as follows:1)3D raster scanning measuring instrument was used to scan the surface of the existing scale model of turbine blade samples,obtain the data point cloud of three-dimensional blade surface was obtained,and the three-dimensional blade surface model was regenerated by fitting the data type point of double cubic b-spline surface,which was selected from the surface data point at a certain interval.Then,combined with the space size and design requirements of the power generation device,the three-dimensional blade surface can be reproduced and the blade model can be generated by adjusting the coordinates of the surface type values.The program of three-element blade surface fitting based on double cubic b-spline fitting was written.2)According to the design requirements of vehicle space,The orthogonal test method was adopted to analyze the influencing factors of blade rotation speed,and the orthogonal table is used to find the primary and secondary influencing factors,the orthogonal table was established to seek primary and secondary influencing factors,and the parameters of gradual expansion device,diversion blade and impeller blade of small axial wind power generation device were optimized,and geometric model was established.3)According to the geometric model,the flow field model combining the dynamic grid calculation method and 6DOF solution model of the power generation device was established in FLUENT and the grid was divided in ICEM CFD,and the rotating region and stationary region were set.For the core impeller set dynamic grid parameters and the physical information of the impeller’s mass,volume,inertia moment and moment of inertia were obtained in UG.UDF programming was used to establish the 6DOF model.In the simulation calculation,the residual value was monitored,the difference of the inlet and outlet flow difference was read,and detailed boundary conditions were set.The fluid dynamics simulation was completed to obtain the change information of pressure and velocity in the flow field and the rotational speed of the blade after stabilization.4)According to the geometric model of small axial wind power generation device,complete the drawing of two-dimensional drawings and process the real object were completed.On the test platform set up in the factory,the power consumption of vehicle-mounted induction motor was simulated when the high pressure centrifugal fan is fully open while the sanitation vehicle is working and when a small wind power generator is installed.The power consumption of the two states was analyzed by comparing the output of three-phase ac permanent magnet generator.The feasibility of the theoretical design and numerical simulation method was verified by the experimental data according to the application example of the design of the small axial wind power generation device.