Aerodynamic Prediction of Rotor in Forward Flight using Blade Element Theory

Abstract

This paper is focusing on analysis of angle of attack and lift distribution along the helicopter blade in forward flight conditions and the effects of increasing helicopter’s speed. The Blade Element Theory (BET) is used throughout this study. The result was in good agreement with the existing data. From the analysis, the angle of attack and lift at retreating side is low compared with advancing side and by increasing the helicopter’s speed, the reverse flow area widen. This analysis will assist researchers on blade modification for the sake of improving aerodynamic characteristic of the helicopter blade as well as stability and performance of the helicopter.