TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
Online ISSN : 2189-4205
Print ISSN : 0549-3811
ISSN-L : 0549-3811
Effect of Mach Number on Airfoil Characteristics at Reynolds Number of 3,000
Seiichiro MORIZAWATaku NONOMURAAkira OYAMAKozo FUJIIShigeru OBAYASHI
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2018 Volume 61 Issue 6 Pages 258-267

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Abstract

The effects of Mach number at Re = 3,000 for different airfoils (NACA0012, NACA0002, NACA4412, NACA4402) with thickness and camber geometries are investigated for the propeller blade design of a Mars airplane. The present study shows that thin and cambered airfoils have larger variations in Cl than symmetric airfoils. As for thin airfoils, Cl at higher α has rapid increases when the M is low. This is because the flow separation occurs at the leading edge, and the flow is reattached on the airfoil surface. However, the rapid increase in Cl disappear as M increases because the flow reattachment does not occurs. As for cambered airfoils, the decrease in Cl becomes larger than that on the symmetric airfoils when M is higher. This is because Cp near the leading edge on the lower surface is smaller than that on the upper surface and the high-speed region on the lower side of the leading edge is enlarged as M increases. Then, the Mcr at Re = 3,000 tends to be larger than that predicted by linear theory.

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© 2018 The Japan Society for Aeronautical and Space Sciences
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