Abstract
In Japan, a 5-year R&D project has been in progress toward the development of an environment friendly high performance regional jet aircraft under auspice from New Energy Development Organization of Japan (NEDO) since 2003. In the project, the research of airframe noise has been conducted for achieving lower commercial noise.At first experiments were conducted on 20%-scale half span model in the JAXA Wind Tunnel from 2005 to 2006. In the test, the array microphone has been used to visualize the airframe sound source and it was found that the slat noise is the one of the biggest sound source for the aircraft approach condition. Then the generation mechanism of the slat noise has been calculated by using CFD for developing the device that was able to reduce the slat noise.
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