Progress on Experimental and Numerical Research for Slat Noise in JAXA

Abstract

This paper summarizes the progress on experimental and numerical research activity for better understanding slat noise in Japan Aerospace Exploration Agency (JAXA). A slat is a leading edge device which is used during take-off and landing of an aircraft to enhance its aerodynamic performance at low speed flight. However, this device is known to be one of the dominant noise sources, especially during the landing phase. To clarify the noise generation mechanism, both experimental and numerical researches are conducted at JAXA. Overall characteristic of slat noise is obtained through several wind tunnel experiments associated with aerodynamic measurements. Large scale computation using large-eddy simulation technique is also performed around the slat region to seek for the relevant unsteady features. Both experimental and numerical results indicate that the dominant noise source from the slat, which has broadband characteristics, is generated around the slat trailing edge.