Three-dimensional characterization of passive flow control devices over an aircraft carrier ski-jump ramp

Bardera, Rafael; Rodríguez-Sevillano, Ángel Antonio; León-Calero, M.; Nova-Trigueros, Joaquín de

doi:10.1177/0954410017716195

Cited by 3 publications

(2 citation statements)

References 16 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…16 Other studies have focused on improving the flow in the bow region of the aircraft carrier by fitting passive devices such as CVGs, bow flaps, and cylindrical sections. [17][18][19][20] Except for the studies carried out by Cherry and Constantino, 2 where they had compared the island configurations of the Nimitz and Ford class, there have been no studies carried out so far, at least in the open domain, on the effect of changes to the island configuration on the external aerodynamics of an aircraft carrier, especially the burble behind the carrier. This paper aims to fill the gap by carrying out parametric investigations on various configurations of the island structure and its effect on the burble behind the carrier.…”

Section: Literature Surveymentioning

confidence: 99%

Effect of modifications to island shape and geometrical configuration on the external aerodynamics of a generic aircraft carrier

Mathew

Singh

Sinha

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

The external aerodynamics of an aircraft carrier plays a vital role in the safe landing of aircraft during take-off and recovery. The hull, flight deck, and the island create a turbulent disturbance behind the aircraft carrier, leading to a simultaneous reduction in forward velocity and a downwash, which together create a sinking effect on the aircraft along its glideslope path. This phenomenon is known as the burble effect. It could potentially increase the pilot’s workload and strain their mental and physical faculties. Any design change that obviates or reduces the burble effect would potentially increase the probability of safely landing the aircraft on an aircraft carrier. There are only a few studies on the external aerodynamics of an aircraft carrier. The primary motivation of this study is to evaluate the effect of modifications to the island structure on the external aerodynamics of a generic aircraft carrier, especially the burble behind the carrier. The first part of the study pertains to the parametric changes to the aspect ratio of the island, that is, its length to width ratio and the consequent impact on the aerodynamics behind the carrier along the flight glide path. The second part of the study focuses on changing the geometry of the island by rounding the assumed cuboid island’s sharp corners, and evaluating its effect on the burble along the glideslope path of the aircraft. For the study, computational fluid dynamics (CFD) analysis on a generic aircraft carrier model has been carried out using the commercially available CFD solver Ansys FLUENT. The CFD studies have been validated by results of experiments conducted in a wind tunnel on the same generic aircraft carrier model. From the studies, it is seen that the aspect ratio of the island greater than one and rounding the sharp edges of the island have beneficial effects in reducing the impact of the burble behind the carrier.

show abstract

Section: Literature Surveymentioning

confidence: 99%

Effect of modifications to island shape and geometrical configuration on the external aerodynamics of a generic aircraft carrier

Mathew

Singh

Sinha

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

show abstract

“…Czerwiec 67 LHA Bow-flap Shafer 64 DDG-81 Porous surfaces, different fence, and blowing Landman 68 LHD Flap and columnar vortex generator (CVG) Findlay 69 DDG-81 Eleven different configurations of fences Greenwell 70 SFS Eight different configurations of inclined screen Kääriä 71 SRF Different side-flap configurations and hangar notch Forrest 65,66 SFS2 Five different modifications including chamfer, flap, tabs, saw-tooth, and cylinder Kääriä 72 SRF Side-flap and hangar notch Kääriä 1 SRF Six windward hangar side-face modifications Mora 73 SFS Four configurations with different hangar roof curvature Mora 74 SFS Active plasma flow control technique with two configurations Bardera 75 Aircraft carrier Cylinder, triangular-notched fence and CVG Bardera 76 Aircraft carrier Different configurations of flat plate, cylinder, and CVG Bardera 77 Aircraft carrier CVG with two angles Matias 78 SFS2 Trapezoidal vortex generator, suction, and blowing Bardera 79 Aircraft carrier CVGs with five spiral parameters one rotor diameter. For medium-weight helicopters, it is usually around 30 m. The NORSTOCK Standard C-004 for the offshore helicopter 83 puts forward the similar requirements to CAP 437.…”

Section: Authors Ship Modificationsmentioning

confidence: 99%

Insight into the factors affecting the safety of take-off and landing of the ship-borne helicopter

Cao

Qin

2021

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

Despite the important role and highly frequent appearance of the helicopter in modern ship operations, the flight mission with take-off and landing of helicopters to ships, especially ships with small-sized decks, could be very challenging and potentially hazardous. Many researches on ship-helicopter dynamic interface (DI) have been conducted, and significant progress has been made. In this paper, a comprehensive and systematical review of the factors affecting the flying qualities of ship-borne helicopter and pilot workload during taking off and landing is derived from these efforts to date. The factors from two aspects, including the ship environment and the pilot-helicopter interface, are covered to address how these factors affect the helicopter handling qualities and pilot workload, primarily focusing on aerodynamic issues. The insight into these factors is not only of great significance for conducting take-off and landing tasks safely but also helpful to establish suitable fidelity criteria and guidelines for the modelling and simulation of the ship-helicopter DI environment.

show abstract

Numeric assessment of the effect of the twin island design on the airflow dynamics around a generic aircraft carrier

Nehra

Vijayakumar

2023

Proceedings of the Institution of Mechanical Engineers, Part M:

View full text Add to dashboard Cite

The twin island concept is the most recent innovation in the top-deck architecture of an aircraft carrier. The carrier’s bluff body design presents the pilot with a number of difficulties, with landing on deck posing the biggest problem. The goal of the current study is to carry out the numerical analysis of the aerodynamic behaviour of twin island structure on Generic Aircraft Carrier. The flow characterization has been performed utilizing the normalized axial velocity and turbulent kinetic energy as aids for establishing pilot workload along the glideslope line. In this paper, multiple transverse planes cut across perpendicular to the flow direction are used to analyse the flow across the flight deck of twin island GAC and its downstream. The impacts of the two islands’ longitudinal translations with regard to the initial GAC position were then investigated and the results were analysed and compiled with reference to the landing approach path of the aircraft. The results show that the twin island designs are preferable to a single island. The maximum advantage in terms of turbulence reduction is achieved when the bifurcated islands are longitudinally repositioned forward of the original single island design position. The modified design not only achieves a 72% reduction in peak turbulence but also provides an additional time advantage to the pilot for assessing the environmental conditions while he is approaching the carrier flight deck for landing thus aiding to efficiently and effectively manage the workload. The findings of this study can act as a driving force for the integration and application of twin island concept in future design plans for floating structures and further studies in the field.

show abstract

Three-dimensional characterization of passive flow control devices over an aircraft carrier ski-jump ramp

Cited by 3 publications

References 16 publications

Effect of modifications to island shape and geometrical configuration on the external aerodynamics of a generic aircraft carrier

Effect of modifications to island shape and geometrical configuration on the external aerodynamics of a generic aircraft carrier

Insight into the factors affecting the safety of take-off and landing of the ship-borne helicopter

Numeric assessment of the effect of the twin island design on the airflow dynamics around a generic aircraft carrier

Contact Info

Product

Resources

About