Spectral features of conical and cylindrical Hartmann resonators are compared in this work
through a systematic parametric study. Experiments have been conducted by varying the
following parameters: stand-off distance, nozzle pressure ratio and cone angle. Resonance
frequencies of conical cavities are found to be higher than those of cylindrical cavities of the
same length. Low (∼ kHz) and high frequency (∼ 10kHz) modes are observed in the
spectra. Low frequency modes show an oscillatory trend with stand-off distance. The high …