The paper presents comparative aerodynamic and aeroacoustic studies on basic models
of blade sections of low-speed, low-Reynolds-number axial fans. The wind tunnel experiments
incorporated representative cambered plate and airfoil blade profiles. The aerodynamic
measurements revealed that, for low Reynolds numbers, cambered plate blade sections
may perform aerodynamically better than airfoil sections. A phased array microphone
system, combined with a dipole beamforming and spatial filtering technique, offered
a potential for localizing the noise sources in both streamwise and transversal direction.
The acoustic studies focused on the profile vortex shedding noise. The results were
qualitatively evaluated and compared with the semi-empirical noise prediction model
developed by Brooks, Pope, and Marcolini. The measurements are considered as preparation
of a dataset contributing to the background for designing high-efficiency, low-noise
axial fans operating at low Reynolds number.