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题名: The Effect of IGV Wake Impingement on the Flow Structure and Turbulence Around a Rotor Blade
作者: Francesco Soranna;Yi-Chih Chow;Oguz Uzol;Joseph Katz
贡献者: NTOU:Department of Systems Engineering and Naval Architecture
关键词: blades;rotors;turbomachinery;wakes;turbulence;vortices
日期: 2006
上传时间: 2011-10-20T08:12:29Z
出版者: ASME Journal of Turbomachinery
摘要: Abstract:The flow structure and turbulence around the leading and trailing edges of a rotor blade operating downstream of a row of inlet guide vanes (IGV) are investigated experimentally. Particle image velocimetry (PIV) measurements are performed in a refractive index matched facility that provides unobstructed view of the entire flow field. Data obtained at several rotor blade phases focus on modification to the flow structure and turbulence in the IGV wake as it propagates along the blade. The phase-averaged velocity distributions demonstrate that wake impingement significantly modifies the wall-parallel velocity component and its gradients along the blade. Due to spatially non-uniform velocity distribution, especially on the suction side, the wake deforms while propagating along the blade, expanding near the leading edge and shrinking near the trailing edge. While being exposed to the nonuniform strain field within the rotor passage, the turbulence within the IGV wake becomes spatially nonuniform and highly anisotropic. Several mechanisms, which are consistent with rapid distortion theory (RDT) and distribution of turbulence production rate, contribute to the observed trends. For example, streamwise (in rotor frame reference) diffusion in the aft part of the rotor passage enhances the streamwise fluctuations. Compression also enhances the turbulence production very near the leading edge. However, along the suction side, rapid changes to the direction of compression and extension cause negative production. The so-called wall blockage effect reduces the wall-normal component.
關聯: 128(1), pp.82-95
显示于类别:[系統工程暨造船學系] 期刊論文





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