Unsteady CFD modelling of ship engine exhaust gases and over-deck air temperatures, and the implications for maritime helicopter operations

Scott, P., White, M. and Owen, I. (2015) Unsteady CFD modelling of ship engine exhaust gases and over-deck air temperatures, and the implications for maritime helicopter operations. In: AHS 71st Annual Forum, 5 - 7 May 2015, Virginia Beach, Virginia.

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Item Type:Conference or Workshop contribution (Paper)
Item Status:Live Archive


This paper describes the results of a Computational Fluid Dynamics (CFD) study into the modelling of unsteady ship airwakes and their interaction with a ship's exhaust efflux. The fluctuating temperatures in the air flow above the flight deck were assessed to determine potential impacts on maritime helicopter operations. A generic ship model was created that is representative of a modern naval single-spot frigate. Included in the simulation was the hot exhaust efflux from three exhaust uptakes representing a ship operating combined gas turbine and Diesel engines, typically found in modern frigates. The unsteady airwake was computed at 40 knots for a Headwind, Green 30° and Green 45° Wind Over Deck (WOD) conditions and the unsteady temperatures were sampled at various locations around the flight deck. The temperature rise limits over the deck as specified in CAP 437 were found to be exceeded for the Headwind and Green 30° cases. The trajectory of the plumes for the Green 30° and Green 45° WOD cases showed that although the over-deck temperatures were within limits, the exhaust gases were entrained in the downwash in the lee of the ship causing the air temperatures to increase in the region where a helicopter would operate for a port-side approach. The resulting air temperatures over and around the flight deck are discussed in relation to helicopter performance and safety, drawing on the experience and practices in the offshore oil industry. © 2015 by the American Helicopter Society International, Inc.

Keywords:Accident prevention, Atmospheric temperature, Computational fluid dynamics, Diesel engines, Engines, Exhaust gases, Exhaust systems (engine), Gas turbines, Gases, Helicopter services, Helicopters, Ionization of gases, Ship models, Ships, Air temperature, Fluctuating temperatures, Maritime helicopter, Off-shore oil industry, Potential impacts, Temperature rise, Unsteady temperatures, Wind over decks, Decks (ship)
Subjects:H Engineering > H410 Aeronautical Engineering
Divisions:College of Science > School of Engineering
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ID Code:18376
Deposited On:29 Dec 2015 20:15

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