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 takeoff 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.

Flow Separation Control of a Vertical Stabiliser using a Rudder-mounted Slat

“…Further study of flow around the slat cove was carried out on a 30P30N multielement aerofoil by Pascioni and Cattafesta (2014) and Wang and Wang (2023) to understand and identify the flow-induced noise source around the slat by investigating the vortex dynamics. Yamamoto et al (2011) studied the influence of slat noise experimentally and numerically, and reported that the dominant noise of the slat was generated at the slat trailing edge.…”

An experimental study of reducing narrowband noise of a slat using chevrons

“…Recently, there has been a significant increase in the number of works by foreign authors devoted to studying the aerodynamic noise appearing during the streamlining of airframe elements (see the reviews [1][2][3]). In many respects, the interest is because the latest achievements in modern turbojet engines with a high bypass ratio have led to a considerable decrease in power plant noise [4,5].…”