Enhancement of Aerodynamic Efficiency of Aerofoil Using Improved Blowing and Suction System

Abstract

Improved Blowing and Suction System (IBSS) is a novel concept that can be effectively implemented in the future aircrafts to improve the aerodynamic performance of aircraft wings. The proposed IBSS consists of a regular wing without its secondary control surfaces and with a Pump. The injection and suction system is used to create additional flow without disturbing the main flow over the aerofoil which effectively delays the boundary layer separation. The injection and suction areas are kept constant and they are located just below the maximum thickness point and suction is created close to the trailing edge. This paper presents a detailed numerical analysis of the proposed IBSS and the study shows that the stalling angle of attack is increased by 60% while the coefficient of lift is increased 37.5% compared to the baseline aerofoil. Also, the commercially used co-flow jet (CFJ) method stalls at 12 angle of attack whereas with the proposed IBSS method the stall occurs at 16 angle of attack. The stalling angle is thus delayed by 33%, thus increasing the aerodynamic performance of the wing as compared to the existing methods. Also, any malfunction in IBSS does not significantly affect the performance of the aircraft. The implementation of IBSS will lead to reduction in weight of the aircraft and the elimination of secondary control surfaces.

Keywords

• co flow jet
• improved blowing and suction system
• aerodynamic efficiency
• stalling angle
• control surfaces
• secondary flow