Technology Development on Control of the Low Reynolds Number Flow by Using Micro Jets

微射流控制低雷诺数流动技术开发

基本信息

批准号：
15360102
负责人：
HONAMI Shinji
金额：
$ 9.34万
依托单位：
Tokyo University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

The objective of the present project is to develop a control system of the low Reynolds number flow by using a micro jet with pulsation. As to the stereo micro Particle Image Velocimetry (PIV), the system is improved to prevent de-focusing by an optical device. The system has a time synchronization between the image, flash timing of the Laser light source and the jet pulsation. By using the high speed video camera with frame rate of 6000 fps, the velocity and the vorticity of the jet, in particular the jet front, are obtained to clarify the puff effect of the jet front as to the dynamic PIV. The synthetic jet and the pulsed jet as well as the continuous jet are injected into a still air or a two-dimensional channel flow in the low Reynolds number range. The effect of pulsation frequency of the jet, the jet diameter and the jet to main-stream velocity ratio on the static and dynamic characteristics of the jet are investigated. A trace of the synthetic jet is observed further downstream region compared with the pulsed and continuous jet in the still air. When the jet is injected into the fully developed channel flow, the synthetic jet is found to be effective for fluid mixing promotion. Then, the MEMS system is constructed for the control of the low Reynolds number flow by using the micro jet with pulsation as a micro actuator in the present project. In the future project, fluidic MEMS with the advanced micro sensor and actuator will be employed because of the MEMS design database obtained in the present project. It will also possible to develop the fluidic MEMS quickly synchronized with the device manufacturing phase. Furthermore, an effective answer and advice for the device manufacturing problems will be made from the view point of the device application. Therefore, the present fruitful results make much contribution to the development of the control technology about the low Reynolds number flow in the future micro fluidic application.

本项目的目标是开发一种使用脉动微射流的低雷诺数流量控制系统。对于立体微粒子图像测速（PIV），系统进行了改进，通过光学装置防止散焦。该系统在图像、激光光源的闪光定时和喷射脉动之间具有时间同步。通过使用帧速率为6000 fps的高速摄像机，获得了射流特别是射流锋面的速度和涡度，以阐明射流锋面对动态PIV的抽吸效应。合成射流、脉冲射流以及连续射流被喷射到低雷诺数范围内的静止空气或二维通道流中。研究了射流脉动频率、射流直径以及射流与主流速度比对射流静态和动态特性的影响。与静止空气中的脉冲和连续射流相比，在更下游区域观察到合成射流的痕迹。当射流注入充分发展的通道流中时，发现合成射流对于促进流体混合是有效的。然后，在本项目中，利用脉动微射流作为微执行器，构建了用于低雷诺数流动控制的MEMS系统。由于目前项目中获得了MEMS设计数据库，因此在未来的项目中，将采用具有先进微传感器和执行器的流体MEMS。还可以与器件制造阶段快速同步地开发流体 MEMS。并从器件应用的角度对器件制造问题做出有效的解答和建议。因此，目前的丰硕成果对未来微流体应用中低雷诺数流动控制技术的发展做出了很大的贡献。