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Wang Q.,Inner Mongolia University of Technology | Hou Y.-L.,Inner Mongolia University of Technology | Hou Y.-L.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | Wang J.-W.,Inner Mongolia University of Technology | Wang J.-W.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2017

A building model with the scale ratio of 1: 4: 4 made by Architectural Institute of Japan (AIJ) was selected. Providing a guarantee about the consistency of inflow condition with the test, a wind profile was achieved by exponential fitting. The performance of CFD prediction of flow around the model based on various turbulence models such as RNG k-ε, Realizable k-ε and LES were investigated and the results was analyzed by comparison with experimental data from the quantitative and qualitative perspectives. The results show that the trend made by CFD is closer to the test value, and the results of the LES models show better agreement with the measured distribution than the RNG k-ε model and Realizable k-ε model. Especially, statistical analysis method was carried out by SPSS, and the parameters named nonparametric significance test and correlation coefficient were used to explore the accuracy of different models qualitatively. And the results found that no significant differences emerged and the correlation coefficients were greater than 0.8 defined high correlation. This verifies the accuracy of the different turbulence models and provides a normative guidance for CFD technology of the numerical simulation of wind turbulence in building environment. © 2017, Science Press. All right reserved.


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.


Zhang L.-R.,Inner Mongolia University of Technology | Zhang L.-R.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | 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: 2012

With the given tip speed ratio, combined with the large eddy simulation method of sliding mesh, this paper did numerical studies on the characteristics of the flow field of the three-blade horizontal axis wind turbine with and without the S-type tip vane. Results showed that: With the S-type tip vane, the speed and pressure distribution of upstream of the wind turbine were improved and more wind energy were absorbed. The differential pressure of the wind turbine between pressure surface and suction surface increased from 1359 Pa to 1756 Pa, which made the power of the wind turbine amplify. The law of tip vortex was consistent to the experimental results of the PIV. Meanwhile, axial velocity of the tip vortex reduced from 15.6 m/s to 13.3 m/s, the energy of vortex and intensity were reduced and the aerodynamic noise was reduced.


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.


Song L.,Inner Mongolia University of Technology | Song L.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | Zhang L.,Inner Mongolia University of Technology | Su M.,Inner Mongolia University of Technology | And 3 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

Based on the characteristics of the energy conversion device with flexible blades, the paper used multi-point simultaneous measuring systems in wind tunnel, established the experimental investigation method for the wind-induced dynamic response of the flexible blades, and systematically studied mechanism of wind induced and vortex-induced vibration of the flexible blade structures. With the Matlab toolbox, contrastively analyzed the wind pressure time series and the power spectral density in tailing edge of the different camber blades. The study showsed that flexible blade camber affects blade flutter amplitude and frequency, the reasonable bending deformation of blades will enhance the stability of the wind turbine. The experimental results can be used as the guidance and reference for the load analysis and aerodynamic design, which also give the basis of understanding of the complicated unsteady aerodynamic features, and provide the support for designing the reliable and high performance wind turbine. ©, 2015, Science Press. All right reserved.


Jiang X.,Inner Mongolia University of Technology | Song L.,Inner Mongolia University of Technology | Song L.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | Su M.,Inner Mongolia University of Technology | And 2 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

Five curved wings with different cambers were selected for investigation, and the experimental device for testing wind pressure at layer boundary of the curved wing was developed by means of wind tunnel test and synchronous manometric method. The pressure distributions on blade surface were tested when the typical angle of attack changes from 5° to 30° and the influence of airfoil bending on lifting force of blade was analyzed. The aerodynamic characteristics of the curved wing at low speed were also investigated. The velocity field at boundary layer of the curved wing was acquired by applying PIV technology at the same time. The regular curves of flowing separation and vortex movement of the curved wing at boundary layer were revealed, and the effects of airfoil bending on transition flow and separation of the curved wing at boundary layer were investigated. ©, 2015, Science Press. All right reserved.


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.


Jiang X.,Inner Mongolia University of Technology | Su M.,Inner Mongolia University of Technology | Song L.,Inner Mongolia University of Technology | Song L.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | And 2 more authors.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2014

Flow field characteristics and pressure characteristics on different blades were simulated in Fluent software with the RNG κ-ε model. With the distributions of velocity field and pressure field, the adhesion and separation conditions of boundary layer in different working conditions were analyzed. Lift coefficient in different blades was solved by corresponding formula. Ultimately the influencing rules on Lift coefficient by blade curvature and attack angle were revealed. It provide many theoretical directions for optimizing the blade of the flexible blade wind turbine.


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.


Guan F.,Inner Mongolia University of Technology | Gao Z.,Inner Mongolia University of Technology | Gao Z.,Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education | Wang J.,Inner Mongolia University of Technology | And 4 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2016

In the DC low speed wind tunnel, 60 circular channel acoustic array applications of the Danish B & K Company, PULSE structural vibration measurement and analysis system and stress-strain dynamic rotating telemetry technology of Danish B & K Company were used for the experiment of 1.4 m diameter S airfoil horizontal axis wind turbine model, the noise distribution characteristics in the total sound pressure level, the location distribution regularity of noise source and the strain amplitude variation along the spanwise under different conditions were obtained. The experimental results show that during the rotation of the wind turbine, the maximum energy area of the noise source is mainly concentrated on the centre blade (r/R=0.54), and the position of the maximum noise source will not change with wind speed and tip speed ratio; the maximum energy area of the noise source mainly occurs at the maximum amplitude area of the blade; The maximum amplitude strain area are mainly concentrated on the central part of blade(r/R=0.51), the maximum amplitude area does not change with wind speed and tip speed ratio. Especially, the cross correlation analysis of the noise sound pressure level and strain amplitude along the blade span-wise direction can be carried out by SPSS statistical analysis software to obtain that the correlation coefficient of greater than 0.8 is highly correlation in the region of the 0.17R-0.74R, the correlation coefficient around 0.85R region is 0.782 which shows a moderate correlation. © 2016, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.

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