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He L.,Inner Mongolia University of Technology | Wang J.,Inner Mongolia University of Technology | Wang J.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | Liu X.,China University of Mining and Technology | And 2 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2013

The 300W wind turbine with the selected dedicated airfoil was designed, based on the Wilson theory. The airfoil aerodynamic performance was compared with the traditional FX63-137. The results show that the valid tip speed ratio range of the dedicated airfoil wind turbine has increased by 2 times than that of the FX63-137 under the same design circumstance, meanwhile, the tip speed ratio λ range corresponding to area with CP value above 0.3 of the power coefficient has expanded from 4.7-6.3 to 4-10.5, but the integral power coefficient changes gently; the maximum thrust coefficient CT has decreased and fluctuated smoothly in high tip speed ratio; the valid torque coefficient CM has expanded from 4.0-6.7 to 3.0-12.0 range. The prototype of the wind turbine had been tested in low speed wind tunnel, which had verified the excellent aerodynamic performance of dedicated airfoil; Within 4-14 m/s wind speed range, when compared with same 300-Watts wind turbine in the market, the power of the dedicated airfoil wind turbine increased by 30.76% averagely, and especially at the speed between 4-6 m/s, the relative increased-rate of the power was higher, which means the low wind speed will show better. The calculation and experiment results suggest that this dedicated airfoil is the ideal wing profile type of wind turbine blade, and the chosen calculating methods are correct and reliable. Source


Wang Q.,Inner Mongolia University of Technology | Wang J.,Inner Mongolia University of Technology | Wang J.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | Hou Y.,Inner Mongolia University of Technology | Hou Y.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

According to the IEA Task 27 project, container was used for modeling the building in present work, and the flow field around the container placed in Zhangbei wind power construction base was simulated based on CFD software. Based on the neutral equilibrium atmosphere boundary layer (NE-ABL) theory for the local wind resource, more precise inflow condition was worked out turbulent characteristics in the vertical direction above the container, the suitable mounting location and height on top of the container for installing a HAWT were cmalyzed from several new perspectives such as wind acceleration factor, average thickness of the turbulent and power increase factor. The results suggest that in the inflow condition of 270.0 degrees, and 1.17 times container height above the container is the low turbulence region, and 1.17 to 1.50 times container height region above the container is the suitable installation height for wind turbine, and the frontier point is the appropriate installation location;the frontier point is the appropriate installation location for the selected wind turbine, the suitable installation height is 1.42 to 1.52 times container height, and in the condition of annual average wind speed, the maximum power increase factor among different wind inflow angles could reach up to 54.5%. This will provide a reference for micrositing of wind turbine at top of the building. ©, 2015, Science Press. All right reserved. Source


Dai Y.-J.,Inner Mongolia University of Technology | Dai Y.-J.,Xinjiang Institute of Engineering | Wang J.-W.,Inner Mongolia University of Technology | Wang J.-W.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | And 4 more authors.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2014

The blade tip downstream noise of the S-Series airfoil horizontal axis wind turbine were tested through acoustic array, ensuring rated wind speed 10 m/s and different tip speed ratios. The results showed that the wind turbine tip radiated noise spectrum is mainly composed of the blade rotation frequency and its harmonics constitute a discrete noise superimposed on the broadband noise below 200 Hz during wind wheel rotation. From 200 to 600 Hz, the noise spectrum is consisting of the tip vortex shedding frequency by the rotating blades generated and the second harmonic of the wind tunnel dynamic fan. The tip vortex shedding frequency increases with the increase in the tip speed ratio. is the maximum point of the rotating base frequency sound pressure level appears on 0.57 of the blade relative radius. With the movement towards the tip, noise gradually decreases. In the axial direction of the wind turbine rotation plane, the radiated noise decreases rapidly between x = 10~60 cm and the radiated noise attenuate rather slowly between x = 60~100 cm. The trajectory of the tip vortex, which is gradually migrated outward, was found. Source


Bai Y.-F.,Inner Mongolia University of Technology | Wang J.-W.,Inner Mongolia University of Technology | Wang J.-W.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | Zhao Y.-X.,Inner Mongolia University of Technology | And 3 more authors.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2014

On the base of a rotary mechanical stress and strain wireless telemetry technology, experiments have been carried out to study characteristics of stress and strain of running blade in once-through low-speed wind tunnel opening paragraph for wind turbine. Results indicate that under the same tip speed ratio, each cross profile of leaf blade outward along the exhibition to the p n, the strain values decrease gradually. With increasing wind speed, strain value increase is greater than the pressure of the suction surface. The blade root strain rate of increase is greater than the tip, and the 0.5R to 0.7R segment strain curve fitting slightly raised, principally is the effect of the aerodynamic force in the cross section; At the same speed, the blade strain decreases with the outward position on each section of the blade along the exhibition and Strain increases with the increase of the cross section of the tip speed ratio, increasing the a of the root tip is more obvious than the leaf root suffered centrifugal parts increased rapidly; at the same wing surface, the strain value of leading edge point is greater than the trailing edge point, the leave of the stress change along the span wise direction external position is decreased. Accumulated experience and referenced methods for carrying out the detect of the dynamic strain on large-scale wind turbine units. Source


Song L.,Inner Mongolia University of Technology | Song L.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | Lin L.,Inner Mongolia University of Technology | Zhang L.,Inner Mongolia University of Technology | And 3 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2014

According to the airfoil theory, using simultaneous pressure measurement technology, the experimental device was established for aerodynamic load of blade on the wind turbine. The orthogonal experiment was carried out in the five airfoils and six angles of attack and 3-10 m/s wind velocity conditions, airfoils aerodynamic load data was obtained, based on the data, nephogram of lift coefficient was charted by Tecplot software. The experimental results initially revealed the effects of blade bending deformation on its aerodynamic load and force characteristics, and explored the relation between angles of attack and force characteristics of the blades. In a certain range of the blade bending deformation, as the curvature increases, the lift coefficient is increasing; but when the blade bending deformation is out of range, the flow loss of pressure surface increases, the lift coefficient is reducing. Source

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