Switching of a Bistable Diverter Valve with Synthetic Jet Actuators
Switching of a Bistable Diverter Valve with Synthetic Jet Actuators
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带合成射流执行器的双稳态分流阀的切换
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Packwood
中科院分区：
文献类型：
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作者：
Nicholas Martin;M. Bottomley;A. Packwood
用于控制内部流体流动的阀门有许多工程应用。传统的设计使用了大量的机械部件，在不利的环境条件下具有潜在的不可靠性以及高功耗。因此，人们对开发使用更少、质量更低的运动部件的流体振荡器产生了研究兴趣。这些系统依赖于流体放大，即控制流作用于需要切换的初级流。一般来说，控制（流）的动量比主要的低一个数量级。双稳态流体振荡器已经在许多实验中进行了研究[1-7]。在tesazov等人的工作中，形成壁向射流的控制端口与一根管子连接在一起，形成一个反馈回路。这在两个通道之间产生了一个自我维持的振荡，可以用回路长度或迎面而来的流量来控制。最近，这些振荡流动装置已被用于钝体和高扬程系统的流动分离控制[9-11]。使用压电元件提供的控制权限概念的流体振荡器已经被其他人研究过[12,13]。在阀门中使用压电元件的优点是振荡频率的变化相对容易。这在流量分离控制[14]等应用中是特别需要的，在这些应用中，阀门的精确流量条件可能会改变或事先不知道，或者流量控制效果与频率有很强的关系[15-17]。本研究的目的是概述一种使用合成射流（SJ）执行器控制双稳态分流阀的替代机制。SJ的净质量通量为零，但在系统边界上有净动量通量[18]。它们是紧凑，低功耗的设备，这使它们成为这种应用的理想选择。
D IVERTER valves for the control of internal fluid flows have a number of engineering applications. Classical designs, which use numerous mechanical parts, can have the disadvantages of potential unreliability in adverse environmental conditions as well as high power consumption. There has therefore been research interest in the development of fluidic oscillators that use fewer, lower-mass moving parts. These systems rely on fluidic amplification, whereby a control flow acts on the primary flow requiring switching. Generally, the control (flow) is at an order of magnitude lower momentum than the primary. Bistable fluidic oscillators have been investigated in a number of experiments [1–7]. In thework of Tesař et al. [8], the control ports that form the wall-normal jet were connected together with a tube, creating a feedback loop. This creates a self-sustaining oscillation between the two channels that can be controlled with the loop length or the oncoming flow rate. Recently, these oscillatory flow devices have been used for flow separation control on bluff bodies and highlift system applications [9–11]. Fluidic oscillators that use the concept of control authority provided by a piezoelectric element have been investigated by others [12,13]. The advantage in using a piezoelement in the valve is the relative ease of variation of the frequency of the oscillation. This is particularity desirable in applications such as flow separation control [14], where the precise flow conditions of the valvemay change ormay not be known beforehand, or where the flow control effect is a strong function of the frequency [15–17]. The aim of this study is to give an overview of an alternative mechanism to control a bistable diverter valve, using synthetic jet (SJ) actuators. An SJ has a zero net mass flux, but a net momentum flux across the system boundary [18]. They are compact, low-power devices, which makes them ideal for this application.