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Dai Y.,Inner Mongolia University of Technology | Dai Y.,Xinjiang Institute of Engineering | Wang J.,Inner Mongolia University of Technology | Wang J.,Wind Energy and Solar Energy Utilization Technology Key Laboratory of Ministry of Education | And 4 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2014

Taking S series new airfoil as an example, the new grid generation strategy was put forward based on the optimum angle of attack of design wind speed with the tip vortex in complex flow, the regional transition layer grid method was used to improve tip vortex simulation. Useing blade body fitted grid area to the central region of the transition layer of mesh grid could capture the tip vortex formation position and size, the high accuracy calculation results could be obtain through control of mesh gradient. The numerical experiment and analysis showed that the grid can reasonably capture details of change information of tip vortices of S series new aerofoil, and detail change characteristics of impeller pressure distribution and wind turbine tip vortex inward migration phenomenon in the early days were discovered. The mesh generation strategy is reasonable and effective.


Dai Y.,Inner Mongolia University of Technology | Dai Y.,Xinjiang Institute of Engineering | Dai Y.,Wind Energy and Solar Energy Utilization Technology Key Laboratory of Ministry of Education | Wang J.,Inner Mongolia University of Technology | And 3 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

The influence vane on noise of wind turbine was explored by adding V tip vane and S tip vane. The acoustic tests of the S reference airfoil wind turbine with V tip vane and S tip vane were carried out in wind tunnel by using acoustic array. The results show that V tip vane or S tip vane makes the noise in wind wheel blade tip decrease to different degree. The noise reducting effect of S tip vane is better than that of V tip vane. The optimal S tip vane makes the noise in wind wheel blade tip reduce by 6.9% at most. ©, 2015, Science Press. All right reserved.


Dai Y.,Xinjiang Institute of Engineering | Dai Y.,Wind Energy and Solar Energy Utilization Technology Key Laboratory of Ministry of Education | Dai Y.,Energy and Fine Management Engineering Technology Research Center | Li B.,Xinjiang Institute of Engineering | And 4 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

Based on using LES to calculate flow field and improving the time resolution, the radiation characteristics of acoustic wave was formed using the sound source integral surface defined by the K-FWH equation. The acoustic field data for flow field of the impeller wake in optimal angle of attack with the designing flow velocity were collected. Distribution and spread of high frequency noise and its harmonic in wake region of blade tip were focused on. At the same time, the radiation characteristics of acoustic wave mutually affected by noises in different regions were also focused on. The calculation results show that the acoustic pressure energy of impeller base frequency in the rotation process of rotator will play dominant role in the acoustic radiation of impeller wake. The eddy sound radiation induced by tip vortex is also important. Because of slower dissipation of the fundamental harmonic energy, the peak parts of spectrum show more. With increasing frequency, the energy dissipation rate of the fundamental harmonic is also accelerating. The trajectory of tip vortex is found. With the monitoring point moving away from the rotation center along the positive X axis, the monitoring point with change characteristics of acoustic pressure value induced by tip vortex moves outward along the radial and approximately appears linear relationship. ©, 2015, Science Press. All right reserved.

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