Abstract

Methods were investigated for reducing the soundpressure level (SPL) of vane-axial fan-burner units used for drying peanuts. Straight-through mufflers 61-cm (24-in.) long with 10-cm (4-in.), fiber-glass-lined walls were evaluated. In the first setup, one muffler on the fan inlet reduced the average SPL 9.9 dBA. The second setup, a muffler on inlet and exhaust reduced the SPL 13.4 dBA. In the third setup, a redesigned housing incorporating absorption areas on inlet and exhaust but allowing a shorter overall length, reduced SPL by 13.5 dBA. With an absorptive insert equal in diameter to the fan hub installed in the inlet side of the fan, the average SPL was reduced by 8.6, 17.3, and 18.1 in the first, second, and third setups, respectively. The effect of the treatments on airflow rate was negligible. Costs of the treatments are discussed.

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Woodward, J., (1976) “Noise Reduction in Vane-axial Fan-burner Units Used for Drying Peanuts”, Peanut Science 3(1), p.15-20. doi: https://doi.org/10.3146/i0095-3679-3-1-4