Flow Visualisation About the Helicopter Deck of the Hydrographic Ship

摘要

Flow visualisation tests were performed about the helicopter deck of a 1/35 scale model of the Hydrographic Ship in the Low Speed Wind Tunnel at the Aeronautical and Maritime Research Laboratory. The model was tested over a range of relative wind angles using tuft, smoke and surface flow visualisation techniques to determine regions of adverse airflow that may have a detrimental effect on helicopter-ship operations in order to meet certification requirements. In particular, turbulent flow in the vicinity of the flight deck, vertical replenishment area and the ship's anemometer installation were identified, photographed and recorded on video. Effects of two fixed ship roll angles on the flow were also investigated. This document contains extensive results for all model configurations tested and describes in detail the flow features observed.