Aerodynamic performance of a vibrating piezoelectric fan under varied operational conditions

[摘要] This paper experimentally examines the bulk aerodynamic performance of a vibrating fan operating in the first mode of vibration. The influence of operating condition on the local velocity field has also been investigated to understand the flow distribution at the exit region and determine the stalling condition for vibrating fans. Fan motion has been generated and controlled using a piezoelectric ceramic attached to a stainless steel cantilever. The frequency and amplitude at resonance were 109.4 Hz and 12.5 mm, respectively. A test facility has been developed to measure the pressure-flow characteristics of the vibrating fan and simultaneously conduct local velocity field measurements using particle image velocimetry. The results demonstrate the impact of system characteristics on the local velocity field. High momentum regions generated due to the oscillating motion exist with a component direction that is tangent to the blade at maximum displacement. These high velocity zones are significantly affected by increasing impedance while flow reversal is a dominant feature at maximum pressure rise. The findings outlined provide useful information for design of thermal management solutions that may incorporate this air cooling approach.

[发布机构] Thermal Management Research Group, Bell Labs, Alcatel-Lucent, I-Dublin, Ireland^1

[效力级别] 无线电电子学

[关键词] Aero-dynamic performance;Local velocity fields;Maximum displacement;Operating condition;Operational conditions;Particle image velocimetries;Pressure-flow characteristics;System characteristics