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Numerical Simulation of Aerofoil with Flow Injection at the Upper Surface

CFD Letters
Volume 12, No. 1, January 2020, Pages 98-110

Chua Bing Liang1, Akmal Nizam Mohammed1,*, Azwan Sapit1, Mohd Azahari Razali1, Mohd Faisal Hushim2, Amir Khalid2, Nurul Farhana Mohd Yusof3

1 Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400, Parit Raja, Batu Pahat, Johor, Malaysia
2 Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, Pagoh Higher Education Hub, 84600 Pagoh, Muar, Johor, Malaysia
3 School of Mechanical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
*Corresponding author:


CFD; Flow Injection; Airfoil; NACA0012


Separation of the boundary layer over an airfoil causes a significant increase in the adverse pressure gradients and the losses of energy resulting in the reduction of the lift force and the increment of drag force. Therefore, delaying and eliminating flow separation is necessary to improve its aerodynamic characteristics. In this study, an injection of flow was introduced at the upper surface/suction side of the aerofoil to control the boundary layer separation effectively. Flow around the NACA0012 airfoil was examined, with the position of flow injection jet at 90° relative to the tangential surface of the airfoil at 20%, 50% and 80% of its chord length. The flow injection velocity was varied from 0%, 10%, 30% and 50% of the free stream velocity, which corresponds to 0, 2.5 x 10-4, 2.25 x 10-3 and 6.25 x 10-3 of the momentum coefficient. The results showed that the most suitable condition was at 10% of the blowing amplitude (2.5 x 10-4 of the momentum coefficient) of flow injection at the trailing edge, which was around 80% of the chord length at the upper surface/suction side. This configuration can successfully increase the lift force and decrease the drag force of the aerofoil at the angle equal to or larger than a stall angle of 16° compared to the baseline aerofoil.


Chua, Bing Liang, et al. “Numerical Simulation of Aerofoil with Flow Injection at the Upper Surface.” CFD Letters 12.1 (2020): 98-110.

Chua, B. L., Akmal Nizam, M., Azwan, S., Mohd Azahari, R., Mohd Faisal, H., Amir, K. & Nurul Farhana, M. Y.(2020). Numerical Simulation of Aerofoil with Flow Injection at the Upper Surface. CFD Letters, 12(1), 98-110.

Chua Bing Liang, Akmal Nizam Mohammed, Azwan Sapit, Mohd Azahari Razali, Mohd Faisal Hushim, Amir Khalid and Nurul Farhana Mohd Yusof.”Numerical Simulation of Aerofoil with Flow Injection at the Upper Surface.” CFD Letters. 12, no. 1 (2020): 98-110.

Chua, B.L., Akmal Nizam, M., Azwan, S., Mohd Azahari, R., Mohd Faisal, H., Amir, K., and Nurul Farhana, M.Y., 2020. Numerical Simulation of Aerofoil with Flow Injection at the Upper Surface. CFD Letters 12(1), pp. 98-110.

Chua BL, Akmal Nizam M, Azwan S, Mohd Azahari R, Mohd Faisal H, Amir K, Nurul Farhana MY. Numerical Simulation of Aerofoil with Flow Injection at the Upper Surface. CFD Letters. 2020;12(1): 98-110.


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