摘要
通过对合成射流流场数值分析,得到合成射流鞍点特征及可控特性。基于对合成射流鞍点特征及其随激励条件变化规律的分析,获得调节合成射流基微泵的控制律。通过对调节控制和未调节控制下微泵的流体力学分析,对微泵控制律进行考核验证。验证结果显示:改变激励条件并相应调节分流板位置,合成射流新产生的'涡对'保持良好,微泵工作于设计状态;而分流板未控制调节下,由于分流板处于合成射流'涡对'形成和发展的关键区域,严重阻碍和破坏了合成射流'涡对'的形成和发展,合成射流对周围流体的卷吸量显著减小,微泵工作远离设计状态,泵流流量显著减小。研究结果表明:分流板控制律对微泵的控制是行之有效的,若激励器振动膜的振动幅值与激励电参数的关系已知,则可由改控制律得到微泵的电参数控制律,从而可以实现微泵的智能化控制。
Through the numerical analysis of the flow fields of the synthetic jet actuator in the quiescent air, the adjustable characteristics of ＂saddleed points＂ appeared on the synthetic jet flow fields are obtained. The control rules of the syn-thetic-jet-based micro-pump are obtained by analyzing the characteristics of ＂saddle points＂ on the synthetic jet flow-field. Then the micro-pump at the dividing-clapboard on and off control conditions are simulated and compared. The micro-pump acts on the designing conditions, the synthetic jet vortex pairs develop sufficiently when adjusting the forcing condition and the position of dividing-clapboard with the control rules. But the micro-pump acts off the designing conditions, the pump flux decreases with a sharp drop when only adjusting the forcing condition, for the dividing-clapboard locates in a key region and baffles the development of the synthetic jet vortex pairs. The results indicate that the micro-pump flux can be adjusted efficiently by the dividing-clapboard, and the control rule can satisfy the claims of adjusting the position of dividing-clapboard. Further, a control rule of electrical parameters can be put forward when achieving the relation between the vibration amplitude of the diaphragm and the forcing electrical parameters, and an intelligent control of the micro-pump can be realized.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2007年第11期34-39,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金(90205016
50176055)。
关键词
微机电系统
微泵
合成射流
鞍点
控制律
Micro electromechanical systemMicro-pump Synthetic jetSaddle point Control rule
