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Title: A comparative analysis of helicopter recovery maneuvers on a SFS by means of PIV and balance measurements
Authors: Matías García, J. C.
Bardera, Rafael
Franchini, Sebastián
Barroso, Estela
Sor, Suthyvann
Keywords: PIV;Forces;Frigate;Helicopter recovery
Issue Date: 23-May-2023
Publisher: Elsevier
Published version:
Citation: Ocean Engineering 275: 114119(2023)
Abstract: The flow field around a frigate is complex due to flow detachments, high velocity gradients, and flow unsteadiness. These flow patterns can endanger helicopter operations around frigates and increase pilot workload above the flight deck. This paper contains a comparative analysis of three different recovery maneuvers: an approach from the stern in the centerline plane (S); a diagonal maneuver (D); and an L-shaped maneuver. The comparison is made using wind tunnel tests with a scaled frigate and a motorized helicopter. For the three maneuvers, velocity contours around the helicopter with Particle Image Velocimetry are obtained. An internal balance is also used to obtain forces and moments on the helicopter during the flight path of the maneuvers. Those measurements show that the wake of the ship mostly affects longitudinal and thrust forces. In addition, pitch torque is highly reduced when the helicopter is behind the frigate superstructure, and the roll moment is also important when the wind angle increases. In the end, an estimation of pilot workload is presented to conclude that L-shaped maneuver is the best for 0° and small WOD angles and D or S recoveries for moderately high negative WOD angles.
Description: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
E-ISSN: 1873-5258
ISSN: 0029-8018
Appears in Collections:(Aeronáutica) Artículos

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