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传热学
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ISSN 打印: 1064-2285
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传热学

DOI: 10.1615/HeatTransRes.2017017272
pages 1-14

NUMERICAL INVESTIGATION OF ICING EFFECTS ON VORTEX SHEDDING IN A CASCADE OF STATOR BLADES

Sam M. Pouryoussefi
Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO, 65211, USA
Yuwen Zhang
University of Missouri, Columbia, MO 65201, USA

ABSTRACT

In this study, the effects of ice accretion in vortex shedding downstream flow over cascade of stator blades are investigated numerically. Periodic boundary conditions were applied to simulate the flow over the cascade. The blade chord length and inlet flow velocity were 10 cm and 70 m/s for all simulations. The k–ε RNG model was employed for turbulence modeling. The velocity magnitudes and velocity vectors were analyzed at different angles of attack ranging from 10 to 35 degrees to investigate the vortex shedding for clean and iced blades. Spectral analysis of vortex shedding was carried out using the power spectral density method. The frequency of maximum vortex shedding frequency and PSD were found at an angle of attack of 30° for both clean and iced blades. At higher angles of attack, superposition of two different frequencies of vortex shedding was observed indicating oscillations with two distinct frequencies in the system. The results of the analysis of the velocity magnitude and velocity vector showed good agreement with the results of spectral analysis with the use of the power spectral density method.


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