Acoustic signature analysis of a bladeless blower

There has always been a concern about acoustic emissions in traditional machinery. For example, in the transportation and power generation sectors, the market demands efficient, compact, lightweight, and low-cost devices with very low noise levels. In such a challenging context, as opposed to conventional turbomachinery, Tesla type bladeless fluid machine has the advantage of reducing the overall noise emis-sions level.The originality of this paper lies in its experimental acoustic signature characterization of a Tesla type bladeless blower, which has never been done before, nor is there any comparison to conventional blowers. A tailored experimental setup is described in order to evaluate the acoustic behavior of Tesla blower pro-totypes at different rotational speeds and distances. To achieve an accurate acoustic characterization, sev-eral measurement methods, as well as post-processing techniques, have been evaluated and compared.The results of this study have been compared with those obtained by conventional blowers, while con-sidering the same tip speeds at different distances. A Tesla blower does not exhibit the blade passage phe-nomenon, as opposed to a conventional blower. A significant contribution of acoustic energy can thus be avoided which is due to its characteristic frequency and its harmonic components, which instead are sig-nificant in conventional turbomachinery overall acoustic noise.As a result of this innovative investigation, it has been determined that the air Tesla blower is signifi-cantly quieter than conventional dynamic machines, thus paving the way to novel applications for blade -less machinery, especially in those cases aimed at achieving a heightened level of acoustic comfort.(c) 2023 Published by Elsevier Ltd.