Fluid Mechanics & Aerodynamics

Fluid Mechanics & Aerodynamics

Numerical Investigation of side Jet Injection in Subsonic Flow and Its Validation with Wind Tunnel Experiments

Document Type : Original Article

Authors
mostafa ghadak 1
Farhad ghadak 2
Abdolali Haghiri 3
sajjad Dorosti 4
1 Master's degree, Imam Hussein (AS) University, Tehran, Iran
2 Assistant Professor، Imam Hussain University، Tehran
3 Aerospace، Assistant Professor، Imam Hussain University، Tehran
4 M.Sc، Imam Hussain University، Tehran.Iran
Abstract
In low-speed conditions and at high altitudes, the aerodynamic control surfaces of flight vehicles often exhibit limited effectiveness. In such scenarios, lateral jet injection serves as a viable alternative for control. The high-At low speeds and high altitudes, the aerodynamic control surfaces of flight vehicles tend to perform inadequately. Jet control injection is considered an effective alternative in such conditions. Due to the injection of high-speed gas, the aerodynamic flow field around the vehicle undergoes significant changes, making it necessary to re-evaluate the flow characteristics. In this study, both numerical and experimental investigations are conducted to examine the effect of control jet injection on aerodynamic coefficients and pressure distribution in the injection regions of a missile at Mach 0.5. The experimental analysis includes Schlieren imaging in the wind tunnel. Experimental data were obtained for both injection-on and injection-off cases and compared with numerical simulations. The results indicate an increase in drag coefficient due to jet injection, while lift and pitching moment coefficients show no significant change. The findings demonstrate that the jet control system performs effectively, and the flow instabilities introduced by the injection are minimal, making this method a viable option for flight control.
Keywords
Wind tunnel testing
Sonic jet Injection
Numerical study
Aerodynamic coefficients
Side jet

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Fluid Mechanics & Aerodynamics
Volume 14, Issue 2 - Serial Number 36
Autumn and Winter
February 2026
Pages 1-12