Effect of geometric aspect ratio and orifice length on the sound pressure level of a Helmholtz resonator

The acoustic performance of a typical Helmholtz resonator is important for optimizing sound absorption coefficient. The acoustic impedance of the Helmholtz resonator varies with different geometric features. As such, various studies have been conducted to investigate some parametric effects like neck length, extended neck, orifice size, cavity size and glazing flow speed. In this study, we explore, numerically, the effect of cavity shape and geometric aspect ratios among other features. We determined the optimum geometric shapes, dimension and flow condition for better sound absorption of the Helmholtz resonator.