ON THE JET REGURGITANT MODE OF A RESONANT TUBE

A conceptual model simplifying the Hartmann–Sprenger tube is suggested and investigated to decouple the regurgitant mode of non-linear physics. In spite of notable difference originating from the complicated flow phenomenon, the resonant behavior of this problem is shown to be dependent primarily on wavelength of resonant wave and depth of the tube. Four main parameters are selected and studied numerically in the present paper: forcing frequency, oscillatory amplitude of the Mach number, distance from oscillatory station to the entry of tube, and tube depth. A resonant motion could be induced by forcing a sinusoidal variation of flow Mach number at the resonance frequency, which supplies vibrational energy to the harmonic system generating compressible waves.