C.H. Kääriä, J.S. Forrest, I. Owen, G.D. Padfield

This paper describes a simulation study evaluating the aerodynamic loading of a model Sea-Hawk (SH-60B) helicopter in the wake of a simple frigate shape (SFS2). Time-accurate CFD airwakes have been computed using Detached-Eddy Simulation (DES) for two wind-over-deck (WOD) conditions and integrated into the FlightLab simulation environment. A simulated rotorcraft model configured to be representative of an SH-60B has been fixed in space at various locations relative to the flight deck of the ship and immersed in the unsteady airwake for a period of thirty seconds. The forces and moments acting on the helicopter model as a result of the airwake have been recorded and analysed in terms of the helicopter location and WOD condition. The specific time-averaged and unsteady aerodynamic loading characteristics have been identified and analysed in terms of their implications for helicopter handling qualities and potential pilot workload. The underlying causes of the aerodynamic loading characteristics encountered in the simulations have been identified through analysis of the CFD airwake data. The capability of this technique to identify specific loading characteristics and to relate them back to the airwake aerodynamics demonstrates its suitability as a means of comparing the severity of different ship airwakes on helicopter operations. Thus, it is feasible that this method could be used to effectively assess the potential benefits of ship geometry modifications to the shiphelicopter dynamic interface.

35th European Rotorcraft Forum 2009,

Conference Paper

englisch

21,0 x 29,7 cm, 13 Seiten

DGLR-Bericht, 2009, 2009-03, 35th European Rotorcraft Forum 2009 - Conference Proceedings; S.1-13; 2009; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

in getr. Zählung;

aerodynamic loads, sh-60 helicopter, rotorcrafts

Bestellbar

2009