Low Reynolds-Number Dependence on Aerodynamic Properties of a HighPerformance Airfoil

Abstract

The High-performance, low-Reynoldsnumber airfoils with a high lift-to-drag ratio
include the SD7003 and Ishii models. Despite
extensive research on aerodynamic features at
specific Reynolds numbers, research on how
aerodynamic qualities are changed by
Reynolds numbers that emerge for common
low-Reynolds-number airfoils is limited. This
study investigates the relationship between
these two airfoils' aerodynamic efficiency and
Reynolds number. The findings show that, in
comparison to the SD7003 airfoil, the Ishii
airfoil is especially less sensitive on the lift
curve's Reynolds number. The lift slope
seldom changes even when the Reynolds
number changes, despite the fact that there is
a little variation over the maximum lift
coefficient for high angles of attack. When
developing wind turbines or small aeroplanes,
there has been a rise in interest in the
previous NACA four-digit series. The NACA
0018 profile is one of the airfoils that are
widely employed for this purpose. However,
almost no additional experimental studies of
this profile have been conducted since 1933, a
period of more than 70 years, to examine its
performance for a range of turbulence
parameters and under the Low and medium
Reynolds values regime. In this paper, the lift
and drag coefficients of the NACA 0018
airfoil are studied in relation to the Reynolds
number and the intensity of the turbulence.