Aircraft Engines are Getting Quieter-So Are Our Wind Tunnels
NASA Glenn's 9-by 15-Low-Speed Wind Tunnel (9 x 15 LSWT) has just completed a series of acoustic improvements that has reduced the facility's background noise to better characterize today's new, quieter aircraft engine fans. The tunnel is the only facility in the country that can simulate takeoff, approach and landing in a continuous subsonic acoustic environment. Built in 1969, the 9x15 L