High-alpha vectoring characteristics of the F-18/HARV

Asbury, Scott C.; Capone, F. J.

doi:10.2514/3.23719

Cited by 23 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thrust-vectoring performance of fluidic vectored nozzle are measured and compared by means specific parameters. 1 These parameters were defined initially by thinking the secondary injection as provided by an external source of bleeding air. In the present case, the secondary flow is extracted from the main nozzle itself by means of the bypass channel.…”

Section: Bdtn Performance Parametersmentioning

confidence: 99%

“…Thrust Vectoring (TV) technologies aim to affect the aircraft (or rocket) dynamics by generating side forces in the nozzle flow. This effect can be achieved either by using deflector devices and movable nozzles, 1 or by manipulating and breaking the symmetry on nozzle of fixed geometry. 2 Lateral components of the thrust vector are used for controlling the aircraft dynamics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical study of secondary mass flow modulation in a Bypass Dual-Throat Nozzle

Hamedi-Estakhrsar

Ferlauto

Mahdavy-Moghaddam

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

The fluidic thrust-vectoring modulation on a Bypass Dual-Throat Nozzle (BDTN) is studied numerically. The thrust vectoring modulation is obtained by varying the secondary mass flow, introducing different area contraction ratios of the bypass duct. The scope of present study is twofold: (i) to set up a model for the control of the secondary mass flow that is consistent with the resolution of the nozzle main flow and (ii) to derive a simplified representation of a valve system embedded in the bypass channel. The simulations of the turbulent airflow inside the BDTN and its efflux in the external ambient have been simulated by using RANS approach with RNG [Formula: see text] turbulence modeling. The numerical results have been validated with experimental and numerical data available in the open literature. The nozzle performance and thrust vector angle are computed for different values of the bypass area contraction ratio. The effects of different secondary mass flow rates on the system resultant thrust ratio and discharge coefficient of the bypass dual-throat nozzle have been investigated. By using the proposed approach to the secondary mass flow modulation, the thrust pitch angle has been controlled up to 27°.

show abstract

Section: Bdtn Performance Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical study of secondary mass flow modulation in a Bypass Dual-Throat Nozzle

Hamedi-Estakhrsar

Ferlauto

Mahdavy-Moghaddam

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

show abstract

“…There are several overpowering benefits of using FTVC in the aspect of moving maneuverability, omission of complex moving parts and better control effectiveness. 1,2 Also, with this kind of control, an aircraft can take off at a very short distance. 3 Herbst 4 illustrated that FTVC seems to be the most promising direction of research for the future.…”

Section: Introductionmentioning

confidence: 99%

Fluidic thrust vector control based on counter-flow concept

Kim

Jin

2018

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

Computational studies are conducted on the supersonic nozzle to investigate the possibility of utilizing counter-flow in fluidic thrust vector control. In this work, the design Mach number of the symmetric supersonic nozzle is set to be 2.5. For the validation of methodology, numerical results are compared with experimental data referred from the literature. Two-dimensional numerical simulations are based on well-assessed standard k–ɛ turbulence model with standard wall functions. Second-order accuracy is ensured to reveal more details of flow field. The system thrust ratio, deflection angle, and secondary mass flow ratio were studied for a wide range of nozzle pressure ratios and secondary pressure ratios. The results indicate that deflection angle and secondary mass flow ratio are found to be decreased with increasing nozzle pressure ratio as well as system thrust ratio. The secondary mass flow ratio and deflection angle decrease with the increase of secondary pressure ratio, and system thrust ratio increases with the increasing of secondary pressure ratio. The secondary mass flow rate remains under 2.4% of the primary flow to obtain efficient thrust vector control at high Mach number.

show abstract

“…The main application of jet-vectoring to the Aerospace field is also known as 'thrust vectoring'. Actual multi-axis thrust vectoring technology is based on movable nozzles which allow unconventional maneuvers safely, even if the aircraft is in aerodynamic stalled conditions [1]. Thrust vectoring is beneficial in terms of maneuverability and effectiveness of aircraft controls.…”

Section: Introductionmentioning

confidence: 99%

Active flow control in supersonic nozzles

Ferlauto

2018

AIP Conference Proceedings

View full text Add to dashboard Cite

Active flow control in supersonic nozzle mainly concerns Fluidic Thrust Vectoring (FTV) strategies. Thrust Vectoring in fixed symmetric nozzles can be obtained by generating a local perturbation at wall causing flow separations, asymmetric pressure distributions and therefore, the vectoring of the primary jet thrust. The control action can be steady, e.g. continuous blowing, or pulsating, e.g. by synthetic jet actuators. In the paper a numerical procedure is explained, which is able to deal with most of the FTV strategies as well as with continuous and pulsating flow excitation. The flow governing equations are solved according to a finite volume discretization of the compressible URANS equations. The effectiveness of different combinations of FTV strategies and flow actuations are presented. The numerical results obtained are compared with the experimental data found in the open literature.

show abstract

High-alpha vectoring characteristics of the F-18/HARV

Cited by 23 publications

References 3 publications

Numerical study of secondary mass flow modulation in a Bypass Dual-Throat Nozzle

Numerical study of secondary mass flow modulation in a Bypass Dual-Throat Nozzle

Fluidic thrust vector control based on counter-flow concept

Active flow control in supersonic nozzles

Contact Info

Product

Resources

About