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基于压电元件驱动的合成射流致动器的LEM特性：综述

LEM Characterization of Synthetic Jet Actuators Driven by Piezoelectric Element: A Review.

作者信息

Chiatto Matteo, Capuano Francesco, Coppola Gennaro, de Luca Luigi

机构信息

Department of Industrial Engineering, Aerospace Sector, Universitá degli Studi di Napoli "Federico II", p.le Tecchio 80, 80125 Naples, Italy.

出版信息

Sensors (Basel). 2017 May 26;17(6):1216. doi: 10.3390/s17061216.

DOI:10.3390/s17061216
PMID:28587141
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5492309/
Abstract

In the last decades, Synthetic jet actuators have gained much interest among the flow control techniques due to their short response time, high jet velocity and absence of traditional piping, which matches the requirements of reduced size and low weight. A synthetic jet is generated by the diaphragm oscillation (generally driven by a piezoelectric element) in a relatively small cavity, producing periodic cavity pressure variations associated with cavity volume changes. The pressured air exhausts through an orifice, converting diaphragm electrodynamic energy into jet kinetic energy. This review paper considers the development of various Lumped-Element Models (LEMs) as practical tools to design and manufacture the actuators. LEMs can quickly predict device performances such as the frequency response in terms of diaphragm displacement, cavity pressure and jet velocity, as well as the efficiency of energy conversion of input Joule power into useful kinetic power of air jet. The actuator performance is also analyzed by varying typical geometric parameters such as cavity height and orifice diameter and length, through a suited dimensionless form of the governing equations. A comprehensive and detailed physical modeling aimed to evaluate the device efficiency is introduced, shedding light on the different stages involved in the process. Overall, the influence of the coupling degree of the two oscillators, the diaphragm and the Helmholtz frequency, on the device performance is discussed throughout the paper.

摘要

在过去几十年中，合成射流致动器因其响应时间短、射流速度高且无需传统管道，符合尺寸减小和重量减轻的要求，而在流动控制技术领域备受关注。合成射流是由相对较小腔体内的隔膜振荡（通常由压电元件驱动）产生的，会产生与腔体体积变化相关的周期性腔体压力变化。受压空气通过一个孔口排出，将隔膜的电动能量转化为射流动能。这篇综述论文探讨了各种集总元件模型（LEMs）的发展，将其作为设计和制造致动器的实用工具。集总元件模型可以快速预测诸如隔膜位移、腔体压力和射流速度方面的频率响应等器件性能，以及输入焦耳功率转化为空气射流有用动能的能量转换效率。通过控制方程的合适无量纲形式，还通过改变典型几何参数（如腔体高度、孔口直径和长度）来分析致动器性能。引入了一个旨在评估器件效率的全面而详细的物理模型，揭示了该过程中涉及的不同阶段。总体而言，本文通篇讨论了隔膜和亥姆霍兹频率这两个振荡器的耦合程度对器件性能的影响。

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本文引用的文献

1
Some aspects of aerodynamic flow control using synthetic-jet actuation.利用合成射流激励进行空气动力学流动控制的某些方面。
Philos Trans A Math Phys Eng Sci. 2011 Apr 13;369(1940):1476-94. doi: 10.1098/rsta.2010.0374.
2
Finite difference time domain electroacoustic model for synthetic jet actuators including nonlinear flow resistance.用于合成射流致动器的包含非线性流阻的时域有限差分电声模型。
J Acoust Soc Am. 2009 Apr;125(4):1911-8. doi: 10.1121/1.3081514.