Numerical Analysis of Effect of Leading-Edge Rotating Cylinder on NACA0021 Symmetric Airfoil

Abstract

The moving surface boundary control (MSBC) has been a Centre stage study for last 2-3 decades. The preliminary aim of the study was to ascertain whether the concept can improve the airfoil characteristics. Number of experimental and numerical studies pointed out that the MSBC can superiorly enhance the airfoil performance albeit for higher velocity ratios (i.e. cylinder tangential velocity to free stream velocity). Although abundant research has been undertaken in this area on different airfoil performances but no attempt was seen to study effect of MSBC on NACA0021 airfoil for and also effects of lower velocity ratios. Thus, present paper focusses on numerical study of modified NACA 0021 airfoil with leading edge rotating cylinder for velocity ratios (i.e.) between 1 to 1.78 at different angles of attack. The numerical study indicates that the modified airfoil possess better aerodynamic performance than the base airfoil even at lower velocity ratios (i.e. for velocity ratios 0.356 and beyond). The study also focusses on reason for improvement in aerodynamic performance by close look at various parameters.

Comparative Computational Study of Double Rotating Cylinder Embedded on Selig S1223 Aerofoil and Flat Plate for High Altitude Platform

“…Validation for the cylinder, Selig S1123 aerofoil, and the flat plate was studied to obtain better results before starting deeper through the CFD process. The validation method has been referred to based on a few research as a guidance for the validation used (Boye et al, 2017;Gowree & Prince, 2012;Merryisha & Rajendran, 2019;Salam et al, 2019). Based on this validation analysis, the embedment of the LECA and CyFlaP was cautiously carried out.…”

“…However, the scholars did not record the pre-and post-aerodynamic characteristics of the modified aerofoil. Additionally, Salam et al (2019) studied the effect of rotating cylinder on NACA0021 and discovered an increase in C L and reduction in drag coefficient (C D ) for all α. Furthermore, a delay in flow separation was also viewed at higher α in view of momentum injection by the leading-edge cylinder.…”