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Effect of bowed/Leaned Vane on the Unsteady Aerodynamic Excitation in Transonic Turbine

Journal of Thermal Science 2019年第1期28卷 133-144页

作者： LIU Jian QIAO Weiyang DUAN Wenhua Turbomachinery Aerodynamics and Acoustics Lab (TAAL) School of Power and Energy Northwestern Polytechnical University

To investigate the effect of bowed/leaned vane configurations on the aerodynamic performance and aerodynamic excitation in transonic high-pressure turbine, the full three-dimensional viscous unsteady numerical simulation was performed by solving N-S equations based on SAS SST *** influence of bowed/leaned vanes on turbine efficiency and efficiency fluctuation was investigated. The action of vane modelling to the overall aerodynamic fluctuation level and the amplitude of each vane passing frequency were analyzed. By comparing instantaneous pressure fluctuation contours in the blade passage with space-time maps, the link of the pressure fluctuation on blade surface with flow distortions was achieved, which can reveal the mechanism of the impact of the vane modelling. As the results suggest, the turbine efficiency is promoted with positively leaned and bowed vane modelling, and the fluctuation of stage turbine efficiency is repressed, which contributes to the smooth running of the turbine stage. The blade aerodynamic excitation on the rotor blade is characterized by the motion of vane trailing edge shock system, and the vane configurations can reduce the fluctuation level on the rotor blade surface effectively. For the positively leaned vane configuration, the aerodynamic excitations at the root and tip region are affected by the impact of the amplitude of the first harmonic, whereas they are reduced with the decrease of the amplitude of the second and higher harmonics at midspan. For the positively bowed vane, aerodynamic excitation is repressed by reducing the amplitude of the third harmonic at the root region, and the first harmonic at the tip region, and the amplitude of each harmonic is reduced at the middle region.

关键词： transonic turbine leaned bowed aerodynamic performance aerodynamic excitation numerical simulation

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Numerical Investigation of the bowed Stator Effects in a Transonic Fan at LowReynolds Number

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Journal of Thermal Science 2017年第1期26卷 25-29页

作者： HUANG Enliang ZHAO Shengfeng GONG Jianbo LU Xingen ZHU Junqiang Key Laboratory of Light-duty Gas-turbine Institute of Engineering Thermophysics Chinese Academy of Sciences Bei-jing 100190 China

The performance of fan stage in a small turbofan engines is significantly affected at high-altitude low Reynolds number. In order to examine the effect of low Reynolds number on the fan stage, 3D numerical simulation method was employed to analyse the performance variations and the underlying flow structure in the fan stage. For the sake of decreasing the influence of low Reynolds number, the different bowed stator airfoils were redesigned and the effect of the modified design was evaluated.

关键词： Transonic Fan Low Reynolds Number bowed Stator

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维普期刊数据库

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Flow separation control by using bowed blade in highly loaded turbine cascades

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Science China(Technological Sciences) 2009年第6期52卷 1471-1477页

作者： YAMAMOTO Atsumasa Japan Aerospace Exploration Agency

Due to the serious flow separations and centralized vortices,there are high secondary losses in highly loaded *** is imperative to find measures to control the flow separation and vortices hence improve the turbine *** paper reports our recent progress on flow separation and vor-tices control in highly loaded turbine cascades by using bowed *** sets of highly loaded tur-bine cascades with the turning angles of 113° and 160°,and each with 7 bowed blade angles 0°(straight),±10°,±20° and ±30° were experimentally *** internal flow field measurement and flow visualization on the blade surfaces were conducted,and the effects of blade bowing on the flow topology,distribution of vorticity and the flow energy loss were *** results show that,for the cascade with the turning angle of 113°,the appropriately positive bow angle could reduce the flow energy loss;whereas for the cascade with the turning angle of 160°,the well selected negative bow angle can give the better aerodynamic performance.

关键词： turbine cascade turning angle flow separation bowed blade

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