Experimental investigation of energy harvesting from swirling flows using a piezoelectric film transducer

摘要: Abstract This paper presents the results of energy harvesting experiments with piezoelectric film transducers placed in swirling air flow. The turbulent flow was created by a centrifugal fan –swirler plate arrangement. field had Reynolds number 15,000–130,000 and swirl 0.3–0.4. mounting mode transducer allows for varying position orientation to optimize harvesting. First, output piezo-film monitored an oscilloscope. Static pressure concurrently measured using fast piezo-resistive sensor. Fast Fourier Transformation (FFT) performed signals order understand interaction eddies. mechanical vibration modes were recorded camera. Finally, voltage rectifying circuit board connected various frequencies. average power measuring across load resistance. A configuration rectangular plastic attachment also tested decrease eigenfrequency piezo-film. longer demonstrated shorter time cycle thus increased output. optimum performance harvester achieved at lower mean velocities reached levels 3 μW.