Abstract：To meet self-powered requirements of the pipeline monitoring system, a composite turbulent bluff-body piezoelectric airflow generator using axial longitudinal vibration mode was proposed in this paper.The structure and working principle of the airflow generator were introduced.The theoretical analysis and experimental tests were carried out to study the influence of the bluff body structure on its performance.Therefore, the principle feasibility of the composite bluff-body piezoelectric airflow generator using axial longitudinal vibration mode was proved.The results show that the average drag increases quadratically with the increasing of flow velocity and bluff-body diameter ratio.The average drag factor increases with the increasing diameter ratio until it reaches a steady-state value of 5.34 finally.For the piezoelectric airflow generator with the flexible bluff body, both diameter ratio and the thickness of bluff body have great influence on the output voltage.There are optimal diameter ratio (α=0.953) and optimal thickness range (0.1 mm<C<0.3 mm) of bluff body to maximize the output voltage.At the high flow velocity, the output voltage of generators with Type-A and Type-B bluff body is higher than that of generator with Type-C bluff body.For the generator with Type-B bluff body, the diameter ratio of rigid body to flexible body has significant influence on the output voltage.There is an optimal rigid-flexible diameter ratio (γ=0.429, γ=0.929) to maximize the output voltage.
梁程1,2，阚君武1,2，张忠华1,2，王淑云1,2，黄鑫1,2，富佳伟1,2. 钝体结构对纵振式压电气流发电机性能的影响[J]. 振动与冲击, 2021, 40(2): 9-14.
LIANG Cheng1,2，KAN Junwu1,2，ZHANG Zhonghua1,2，WANG Shuyun1,2，HUANG Xin1,2，FU Jiawei1,2. The influence of bluff body structure on the performance of a piezoelectric airflow generator using axial longitudinal vibration mode. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(2): 9-14.
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