Bluff Body Aerodynamics

发布时间 :2017-03-06 

主持人朱乐东研究员

报告人:Professor Richard George James Flay, BE(Hons), PhD, FIMechE, FIPENZ, FRINA, MASME

        Director, Yacht Research Unit

        President, Royal Institution of Naval Architects (NZ Division)

        Chair, 9th Asia Pacific Conference on Wind Engineering, Auckland, December, 2017

        Mechanical Engineering, Faculty of Engineering

        The University of Auckland

        New Zealand

 

 Bluff Body Aerodynamics

摘  要:The aerodynamic characteristics of bluff bodies differ substantially from streamlined bodies, and an understanding of bluff body aerodynamics is essential to make progress in understanding wind engineering. Streamlined bodies like aircraft wings have a rounded nose, a thin profile, and a sharp trailing edge. Their wakes are small and for small angles of attack, the lift force developed is considerably greater than the drag force. On the other hand, bluff bodies have a large separated wake, with unsteady flow, and the drag force is comparable with the lift force. It is necessary to understand the size and nature of these forces to ensure that engineered designs are fit for purpose under wind action.

 间:2017年3月6号 14:30-16:30

 :桥梁馆一楼报告厅

 

Introduction of the Speaker

 

Professor Flay studied Mechanical Engineering at the University of Canterbury, graduating BE (Mech) with 1st Class Honours in 1975. He then registered for his PhD at the same university and graduated in 1979 with a PhD in Wind Engineering. This was followed by a period of two years as a National Research Council Visiting Fellow at the Atmospheric Environment Service, Environment Canada, Toronto, where he worked with Dr Hans Teunissen, carrying out research in wind engineering using a Boundary Layer Wind Tunnel. He then moved to a consulting company in Toronto for a period of four years, where he was employed as an Aerodynamic Design engineer, and carried out design work on many different kinds of wind tunnels, both subsonic and supersonic.

 

Since returning to New Zealand, Professor Flay joined the Mechanical Engineering Department in 1984 as a senior lecturer. He has been Professor of Mechanical Engineering since 2000. He is Director of the Yacht Research Unit, President of the Royal Institution of Naval Architects (NZ Division), and Chair of the 9th Asia Pacific Conference on Wind Engineering to be held in Auckland in December 2017.

 

His research interests are focused on the wind, and he has consulted and researched in the areas of wind engineering, wind energy, wind tunnel design, wind tunnel testing and sail aerodynamics. A highlight was his design of the world’s first wind tunnel capable of producing twisted flow for testing yacht sails. This wind tunnel was used by Team New Zealand, and helped them win the America’s Cup in 1995 and successfully defend it in 2000. More recently he has advised on the design of wind tunnels in England, Hong Kong, Australia, India and New Zealand. His main teaching areas are fluid mechanics, thermodynamics, aerodynamics, design, wind engineering and yacht engineering.

 

In 2015 the Wind Engineering Research Group moved to a new campus at Newmarket in Auckland, and Prof. Flay designed a large Boundary Layer Wind Tunnel with a test section 20 m long x 3.6 m wide x 2.5 m high which was completed in June 2015.The wind tunnel is used for teaching, research and commercial testing. Wind engineering studies are carried out in this wind tunnel using a 512-channel electronically scanned pressure system, several JR3 high frequency force balances, and pedestrian level wind investigations using Irwin probes and the erosion technique. The wind tunnel is also used for cycle aerodynamic drag testing and vehicle testing with a moving ground-plane under the model vehicle.

 

Professor Flay’s more recent research has concentrated on wind flows over complex terrain, modelling wind loads on bridges, sail aerodynamics, turbine blade loading, loads on large roofs, extreme wind speeds for wind loading design in New Zealand, and the aerodynamics of buoyancy vortices in the atmosphere.

 

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