Nomenclature A = cross-sectional area of combustion chamber, m 2 , and amplitude factor in Eqs. (2) and (3) c = speed of sound, m/s d = diameter of resonators' opening, m / = frequency, Hz /o = resonant frequency, Hz / = Bessel function of first kind t = orifice length of Helmholtz resonator, m, and longitudinal mode number and eigenvalue in Eqs.(1) and (4) t R = orifice length of quarter-wave resonator, m A£ = orifice length correction of resonators LC = idealized cylinder length of combustion chamber, m LR …
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