Online from: 1929
Subject Area: Mechanical & Materials Engineering
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|Title:||Analysis of dual secondary injection for thrust vectoring|
|Author(s):||Elham Mohammadi, (Aerospace Department, Shahid Beheshti University, Tehran, Iran), Alireza Toloei, (Aerospace Department, Shahid Beheshti University, Tehran, Iran)|
|Citation:||Elham Mohammadi, Alireza Toloei, (2011) "Analysis of dual secondary injection for thrust vectoring", Aircraft Engineering and Aerospace Technology, Vol. 83 Iss: 4, pp.213 - 220|
|Keywords:||Computational fluid dynamics, Convergent-divergent nozzle, Dual secondary injection, Flow, Fluid mechanics, Forces, Fuel, Side force, Thrust vector control, Turbulent flow|
|Article type:||Research paper|
|DOI:||10.1108/00022661111138620 (Permanent URL)|
|Publisher:||Emerald Group Publishing Limited|
|Acknowledgements:||The authors would like to express their deep gratitude to Dr Mohsen Nazari and Mr Elham Mohammadi for their kind guidance in this research. At the time of this research, Elham Mohammadi was a graduate student in Shahid Beheshti University.|
Purpose – The purpose of this paper is to analyze the flowfield structure and performance of dual secondary injection system for thrust vectoring in a convergent-divergent nozzle and to compare it with a single secondary injection system.
Design/methodology/approach – Dual secondary injection for thrust vectoring in a convergent-divergent nozzle is studied by solving three-dimensional Reynolds-averaged Navier-Stokes equations by the means of Fluent. Realizable k-? turbulent model with enhanced wall-treatment approach is used for viscous model. Density-based solver and explicit scheme are employed in the computational model. In order to study the effect of injection location on the flowfield, distance between ports is considered as the key variable.
Findings – Results show that under some circumstances, dual secondary injection system is more effective than a single injection system with the same mass flow rate. The study shows that when the distance between two ports is 8.5 times of the injection port's diameter (or more) and in the same time the first injection port is at least 1 throat diameter far from the nozzle throat, this system will show a better performance. In addition, this system reduces the probability of bow shock impingement to the opposite wall and consequently, the side force production has less limitation.
Practical implications – Dual secondary injection for thrust vector control (SITVC) needs less secondary flow and therefore it makes less reduction in the primary thrust. It means that for a specific primary thrust, less mass fuel is needed which makes it more economic regarding the traditional SITVC systems.
Originality/value – The paper's value lies in using a three-dimensional model to study the effect of two ports distance on SITVC performance and comparison among the performance of dual and single injections when there is an impingement.
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