Work

Noise and flow characteristics of a howling internally mixed jet

Year: 2026

Type: article

Abstract: The noise emitted by axisymmetric, dual-stream, internally mixed jets was studied. At a jet Mach number of 0.90, the jet howled loudly (i.e., acoustic tones dominated over the broadband jet noise) for multiple mixing-duct lengths and for both unheated and heated core flows. Particle-image velocimetry data revealed that the jet’s potential core was substantially shortened when the howling occurred and there were intense velocity fluctuations in the jet’s shear layer. Using schlieren images, it was shown the jet’s instability waves were excited at the frequency of the fundamental acoustic tone, suggesting a flow/acoustic interaction was responsible for these observations.

Source: International Journal of Aeroacoustics

DOI: 10.1177/1475472x261452751

Authors: David N Ramsey, Reagan Mayo, Aharon Z Karon, Robert Funk, K K Ahuja

Institutions: Georgia Institute of Technology, Georgia Tech Research Institute

Language: English

Topic: Aerodynamics and Acoustics in Jet Flows

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,150

Funders: Federal Aviation Administration, National Science Foundation Graduate Research Fellowship Program