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Aerodynamic Load

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Xiong Liu – One of the best experts on this subject based on the ideXlab platform.

  • vibration induced Aerodynamic Loads on large horizontal axis wind turbine blades
    Applied Energy, 2017
    Co-Authors: Xiong Liu, Shi Liang, Ajit R Godbole, Yan Chen

    Abstract:

    The blades of a large Horizontal Axis Wind Turbine (HAWT) are subjected to significant vibrations during operation. The vibrations affect the dynamic flow field around the blade and consequently alter the Aerodynamic forces on the blade. In order to better understand the influence of blade vibrations on the Aerodynamic Loads, the dynamic stall characteristics of an S809 airfoil undergoing translational motion as well as pitching motion were investigated using Computational Fluid Dynamics (CFD) techniques. Simulation results indicated that both the out-of-plane and in-plane translational motions of the airfoil affect the unsteady Aerodynamic forces significantly. In order to investigate the effects of blade vibration on the Aerodynamic Load on a large-scale HAWT blade during its operating lifetime, an Aerodynamic model based on the Blade Element-Momentum (BEM) theory and the Beddoes–Leishman (B–L) dynamic stall model was proposed. The BEM model was revised to account for the vibration-induced velocity components in the calculation of the effective angle of attack. Aerodynamic Load analysis of a 5MW wind turbine was then performed and the impact of blade vibration on the lifetime Aerodynamic fatigue Loads was analysed.

  • Influence of the vibration of large-scale wind turbine blade on the Aerodynamic Load
    Energy Procedia, 2015
    Co-Authors: Xiong Liu, Shi Liang, Ajit R Godbole, Yan Chen

    Abstract:

    Abstract The blades of a large wind turbine are subjected to significant vibrations during operation. The vibrations will impact the dynamic flow field around the blade and consequently alter the Aerodynamic forces. In order to better understand the influence of blade vibrations on the Aerodynamic Loads, the dynamic stall characteristics of an S809 airfoil undergoing various types of motion were investigated using Computational Fluid Dynamics (CFD) techniques. Simulation results indicated that the in-plane and out-of-plane translational motions of the airfoil affect the Aerodynamic forces significantly. Furthermore, the influence of vibrations on the Aerodynamic Loading on the blade of a 5 MW wind turbine was investigated using the Blade Element-Momentum (BEM) theory and the Beddoes-Leishman (B-L) dynamic stall model.

Yan Chen – One of the best experts on this subject based on the ideXlab platform.

  • vibration induced Aerodynamic Loads on large horizontal axis wind turbine blades
    Applied Energy, 2017
    Co-Authors: Xiong Liu, Shi Liang, Ajit R Godbole, Yan Chen

    Abstract:

    The blades of a large Horizontal Axis Wind Turbine (HAWT) are subjected to significant vibrations during operation. The vibrations affect the dynamic flow field around the blade and consequently alter the Aerodynamic forces on the blade. In order to better understand the influence of blade vibrations on the Aerodynamic Loads, the dynamic stall characteristics of an S809 airfoil undergoing translational motion as well as pitching motion were investigated using Computational Fluid Dynamics (CFD) techniques. Simulation results indicated that both the out-of-plane and in-plane translational motions of the airfoil affect the unsteady Aerodynamic forces significantly. In order to investigate the effects of blade vibration on the Aerodynamic Load on a large-scale HAWT blade during its operating lifetime, an Aerodynamic model based on the Blade Element-Momentum (BEM) theory and the Beddoes–Leishman (B–L) dynamic stall model was proposed. The BEM model was revised to account for the vibration-induced velocity components in the calculation of the effective angle of attack. Aerodynamic Load analysis of a 5MW wind turbine was then performed and the impact of blade vibration on the lifetime Aerodynamic fatigue Loads was analysed.

  • Influence of the vibration of large-scale wind turbine blade on the Aerodynamic Load
    Energy Procedia, 2015
    Co-Authors: Xiong Liu, Shi Liang, Ajit R Godbole, Yan Chen

    Abstract:

    Abstract The blades of a large wind turbine are subjected to significant vibrations during operation. The vibrations will impact the dynamic flow field around the blade and consequently alter the Aerodynamic forces. In order to better understand the influence of blade vibrations on the Aerodynamic Loads, the dynamic stall characteristics of an S809 airfoil undergoing various types of motion were investigated using Computational Fluid Dynamics (CFD) techniques. Simulation results indicated that the in-plane and out-of-plane translational motions of the airfoil affect the Aerodynamic forces significantly. Furthermore, the influence of vibrations on the Aerodynamic Loading on the blade of a 5 MW wind turbine was investigated using the Blade Element-Momentum (BEM) theory and the Beddoes-Leishman (B-L) dynamic stall model.

L Guan – One of the best experts on this subject based on the ideXlab platform.

  • CSCWD – Multidisciplinary analysis transient flow effects on the impeller in a semi-open centrifugal impeller stage
    2017 IEEE 21st International Conference on Computer Supported Cooperative Work in Design (CSCWD), 2017
    Co-Authors: L Guan

    Abstract:

    Centrifugal compressors present very complex unsteady characteristics under running. The influence of unsteady Aerodynamic Load on blades surface may be related to the blade fracture. This issue involves Aerodynamics, engineering thermodynamics, structural mechanics, computational fluid dynamics, mathematics, etc. A multidisciplinary analysis method based on CFD software has been applied to predict the flow field in a semi-open impeller stage of a centrifugal compressor, to analyze 3D flow characteristics in the transient flow field and Aerodynamic Load on the blade surfaces. Mechanism with a high amplitude frequency was focused on. Combined with entropy distribution diagrams, the wake vortex shedding frequency and the interference frequency generated by low-energy groups were captured. Results indicate that the wake vortex shedding and the low-energy groups are the main factors causing high Aerodynamic Load on the impeller blade. The large pressure pulsation generated by wake vortex shedding and low-energy group may greatly threaten the blade safety. This study provides beneficial references for the analysis of blade fracture causes in a semi-open impeller stage of a centrifugal compressor.

  • a simplified model of semi open impeller stage and analysis of its effects on the transient flow
    Applied Mechanics and Materials, 2014
    Co-Authors: L Guan, Zi Fu Lu

    Abstract:

    The centrifugal compressor is one type of vital energy conversion equipment and its unsteady characteristics are extremely complex in actual operation. A semi-open impeller stage with inlet guide vanes, an impeller and a diffuser in a centrifugal compressor was concerned. For simulation of unsteady flow, the full-passage model of the integrate stage requires much more simulating time and memory space, higher computer configuration. Therefore, a single-passage simplified model was established for unsteady analysis. The internal flow characteristics and Aerodynamic Load on the blade obtained by the simplified model were also compared with that by the full-passage model. The result shows that the precision of the simplified model can meet the engineering requirement. Compared with the full-passage model, the simplified model can give a relatively true reflection of the local flow characteristics and the Aerodynamic Load on blade surfaces, but it ignores the unevenness resulted from unsteadiness along circumferential direction. Only high-frequency information is retained in Aerodynamic Load analysis while low-frequency one is diluted. However, as far as the local flow pattern or high-frequency information resulted from unsteady effects is concerned, the simplified model provides the advantages of higher computational efficiency and lower hardware requirements.