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Experimental investigation of flowfield over an iced aerofoil

Published online by Cambridge University Press:  18 May 2016

M.D. Manshadi  and
M.K. Esfeh
M.D. Manshadi*
Affiliation:
Department of Mechanical and Aerospace Engineering, Malekashter University of Technology, Isfahan, Iran
M.K. Esfeh
Affiliation:
School of Mechanical Engineering, Yazd University, Yazd, Iran
*
[email protected]
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Abstract

Wind-tunnel measurements were used to study the characteristics of the unsteady separation bubbles on a NACA 0015 aerofoil with simulated two-dimensional leading-edge glaze ice accretions. The unsteadiness present in the iced-aerofoil flowfield was determined using measurements of the time-dependent aerofoil surface pressure distribution at Reynolds number of 1.0 × 106. Additionally, the unsteady flow features were investigated through the power spectrum of the stream-wise velocity fluctuations using a hot-wire anemometry. The results showed that the highest value of root-mean-square fluctuation of the surface pressure consistently occurred upstream of the mean shear-layer reattachment location. Spectral analysis of stream-wise velocity fluctuations near reattachment location revealed evidence of the regular frequency at Strouhal numbers of 0.5-0.63. Moreover, the low-frequency oscillations associated with shear-layer flapping was also identified in the wake velocity spectra on the order of 10 Hz that resulted in Strouhal numbers of 0.0186-021.

Keywords

iced-aerofoilunsteady separation bubblespressure distributionhot-wire anemometry
Type
Research Article
Information
The Aeronautical Journal , Volume 120 , Issue 1227 , May 2016 , pp. 735 - 756
Copyright
Copyright © Royal Aeronautical Society 2016 

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