Abstract
In order to improve the adaptive range of airflow velocity, an airflow piezoelectric generator based on multi-harmonic excitation is proposed. The flow field characteristics are obtained by CFD method, the acoustic vibration characteristics and variation with velocity of the excitation frequency are studied. The result shows that periodic compression and expansion of air are presented and a standing wave is formed inside the resonator, which can provide stable excitation source. The excitation frequencies are distributed on the acoustic modes of the resonator and captured. With different velocity segment, the excitation frequencies are different, and frequency conversion is presented from the first-order to the third-order and from the third-order to the first-order. The conclusions verify the feasibility of the multi-harmonic excitation energy exchange scheme, which is helpful to improve the flow velocity adaptive range of the airflow-induced vibration piezoelectric generator.
Highlights
Wireless sensor node network has been widely used in aerospace, military construction, transportation, agriculture and other fields [1], but the power supply is a new problem
The airflow piezoelectric generator with the transducer diameter of 34 mm is designed by Lei Jun-ming [4], the resonance characteristic, the output performance of the generator are studied by experiment
A MEMS air-driven fluidic resonance piezoelectric generator for fuze is proposed by Xu Wei [5], the vibration displacement and the output voltage of the generator are studied
Summary
Wireless sensor node network has been widely used in aerospace, military construction, transportation, agriculture and other fields [1], but the power supply is a new problem. A resonant tube with a piezoelectric transducer at the bottom is placed behind the blunt body by D-A Wang [7] based on vortex-induced vibration, the maximum output power of 0.2 W can be generated. Based on the system of jet-resonator, the scheme of a small airflow piezoelectric generator is presented by Chen Huejuan [8,9,10,11], and the characteristic of excitation, structure parameters and output are studied. When the excitation frequency deviates from the natural frequency of the piezoelectric transducer, the output power can decrease sharply, and the range of the airflow velocity is limited to a certain extent. Based on the literature [8], a scheme for airflow piezoelectric generator with multi-harmonic excitation is proposed. Aiming at the excitation characteristic, the flow field characteristic is obtained by CFD method, and the characteristic of acoustic vibration and the relationship between the excitation frequency and the airflow velocity are studied to verify the feasibility of the scheme
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