Stereo PIV Application to 6.5m x 5.5m Low-speed Wind Tunnel
External research report
- Publisher: National Aerospace Laboratory(NAL)
National Aerospace Laboratory of Japan RESEARCH PROGRESS 2001
Stereo PIV, large-scale wind tunnel, subsonic flow
Large-scale wind tunnels at NAL have been utilized to acquire data on aerodynamic characteristics for the development of various types of airplane and aerospace vehicle. Although in most cases measurements concentrate on the information needed directly for vehicle design, such as aerodynamic force and moment, surface pressure, and aerodynamic heating, the need for detailed spatial information on flows around vehicles is gradually increasing as the result of advancements in vehicle design technology. In response to this recent trend, we have employed a velocity measurement system, known as Particle Image Velocimetry (PIV), which allows us to acquire instantaneous, planar velocity field data around the models in our wind tunnels. Although the PIV technique is wellestablished for use in laboratory-scale fluid dynamic research, its application in industrial experiments conducted in large-scale facilities is limited even in the established wind tunnels around the world. In the PIV technique, the displacement of illuminated seed particles mixed in the fluid for very short period is measured by a camera, providing an instantaneous velocity map in the plane. 2D PIV using a camera gives two components of velocity while "stereo" PIV using two cameras can measure three components of velocity. In this article, we introduce the status of stereo PIV system development, and present some preliminary test results in a 6.5m x 5.5m low-speed wind tunnel.