![]() In this case, the vortical disturbances of the turbulent boundary layer scatter at the sharp trailing edge into sound. One of the dominant broadband noise generation mechanisms is due to the interaction of the turbulent boundary layer with the trailing edge of the fan blades. By contrast, due to a relatively poorer understanding of fan broadband noise, it has become a dominant noise source in modern aero-engines. With the advance of more effective low noise engine technologies, such as ultra high bypass ratio engine and lower speed fans, significant reductions in the jet noise have been realized. Introduction abstract Until recently the main source of engine noise from commercial aircraft has been from the jet. Davies ISVR, University of Southampton, Tizard Building 13, University Road, Southampton, SO17 1BJ, UK article info Article history: Received 7 March 2008 Received in revised form 29 June 2008 Accepted 30 June 2008 Available online 15 August 2008 Keywords: Wind tunnel design Silencer Trailing edge noise 1. Design and performance of an open jet wind tunnel for aero-acoustic measurement T.P. ![]()
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