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Journal of Undergraduate Research

Keywords

acoustic beamforming, sub-arrays, jet engine noise

College

Physical and Mathematical Sciences

Department

Physics and Astronomy

Abstract

In Jet engine noise is a large and complex area of research due to the intricacies of the variety of different mechanisms that produce noise traveling in different directions. The dominate noise source is called turbulent mixing noise (TMN) which is created by the interaction of the column of air mixing with the ambient air. Two types of TMN exist: large-scale TMN, the dominant noise source that travels away from the aircraft in the aft quadrant and fine-scale TMN that travels in all directions1. The second type of noise is known as broadband shock-associated noise (BBSAN), which is generated by the interaction of the large-scale TMN with the shock cells in the exhaust from a supersonic jet flow. BBSAN travels at an angle directed toward the side and front of the aircraft. Both BBSAN and TMN are postulated to originate from overlapping regions, even though they propagate in different directions as illustrated in Figure 1. The purpose of this research is to create equivalent numerical models that represent the sources of these noise types.

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