Abstract
This paper develops a fan noise prediction model intended for use in the design of systems for cooling and drying. Airflow through a system is described by a dimensionless resistance parameter. Fan noise is predicted by a scaling relationship obtained from a dimensional solution of Lighthill’s acoustic analogy. The scaling relationship contains unknown proportionality factors, which are determined empirically and compared for axial fans and centrifugal blowers. The dependence of fan and blower noise spectra on non‐dimensional scaling parameters is also investigated.
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