Abstract
Nonlinear evolution of disturbances in an axisymmetric, high subsonic, high Reynolds number hot jet with forced eigenmodes is studied using the Parabolized Stability Equations (PSE) approach to understand how modes interact with one another. Both frequency and azimuthal harmonic interactions are analyzed by setting up two modes at higher initial amplitudes and various phases. Controlling the evolution of a specific mode has been made possible by forcing two modes (m1, f1), (m2, f2), such that the difference in azimuth and in frequency matches the desired “target” mode (m1 − m2, f1 − f2). A careful set-up of the initial amplitudes and phases of the two forced modes, defined as the “killer” modes, has allowed the minimizing of the initially dominant instability in the near pressure field, as well as its estimated radiated noise with a 15 dB loss. Although an increase of the overall sound pressure has been found in the range of azimuth and frequency analyzed, the present paper reveals the possibility to make the initially dominant instability ineffective acoustically using nonlinear interactions with forced eigenmodes.
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