Abstract
The paper presents the CFD study of a Coanda-effect based nozzle, developed within the European FP7 project ACHEON. The ACHEON nozzle is able to provide a directional thrust without any movement of mechanical parts, by utilizing the Coanda effect to divert a jet from the symmetry axis. The deviation of the jet produces an oriented thrust vector due to the existence of a perpendicular component to the main propulsive direction. The studied nozzle is envisaged to be applied to UAVs. The directional thrust control—its deviation from the symmetry axis—is achieved by the relative mass flow variations between the two inlet jets. The geometry of the nozzle forces the resulting jet to follow the desired trajectory, thus by controlling in this way the thrust direction exerted by the nozzle. The influence of the selected parameters on the control of the thrust direction has been studied using CFD. In particular, the dependency of the thrust change in respect to the inlet conditions is analysed for different scenarios, with special focus on the thrust magnitude and its direction. The following parameters affecting the flow field of the nozzle have been studied: (a) the ratio of inlet velocities, (b) the Reynolds number at the throat and (c) the geometrical ratio throat/cylinder. Significant dependences between the identified parameters have been observed.
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- ACHEON:
-
Aerial Coanda High Efficiency Orienting-jet Nozzle
- CFD:
-
Computational Fluid Dynamics
- c T :
-
Thrust coefficient
- D th :
-
Throat diameter
- HOMER:
-
High-speed Orienting Momentum with Enhanced Reversibility
- j :
-
Mass velocity
- k :
-
Turbulent kinetic energy
- p :
-
Static pressure
- q :
-
Dynamic pressure
- r :
-
Radius
- Re :
-
Reynolds number
- s :
-
Throat slot
- S :
-
Inlet surface
- SST:
-
Shear Stress Transport model
- SA:
-
Spallart–Almaras model
- T :
-
Thrust force
- v :
-
Flow velocity
- ε:
-
Turbulent dissipation rate
- \(\mu\) :
-
Dynamic viscosity
- \(\rho\) :
-
Flow density
- θT :
-
Thrust angle
- θj:
-
Separation point
References
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Acknowledgments
The presented work in this paper was performed as part of the Aerial Coanda High Efficiency Orienting-jet Nozzle (ACHEON) project, supported by European Commission through the 7th Framework Programme, and which is gratefully acknowledged.
We would like to acknowledge the data provided by the ACHEON consortium partners, whose results have been considered as guidance for the performed simulations.
Special thanks go to Maharshi Subhash for his valuable help in turbulence modeling and boundary layer analysis and to the Flow Vision team for their support in setting up the CFD simulations.
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Suñol, A., Vucinic, D., Vanlanduit, S. (2015). CFD Modelling of the Coanda Based Thrust Vectoring Nozzle. In: Shaari, K., Awang, M. (eds) Engineering Applications of Computational Fluid Dynamics. Advanced Structured Materials, vol 44. Springer, Cham. https://doi.org/10.1007/978-3-319-02836-1_6
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DOI: https://doi.org/10.1007/978-3-319-02836-1_6
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