【作者】 孙健；

【导师】 汪健生；

【作者基本信息】 天津大学 ， 工程热物理， 2007， 硕士

【摘要】 MEMS技术与流动控制技术的结合,使得流动主动控制技术的实际应用逐步变成现实,极大地推动了流动主动控制技术地发展,本文简述了流动主动控制技术的基本原理、关键技术,以及应用MEMS技术实现流动主动控制的机理和途径。介绍了流动主动控制技术领域基于MEMS技术的微传感器、微控制器和微执行技术及集成技术的进展。本文采用LES的方法对槽道进行了二维数值模拟,通过模拟获取了流场瞬态的数据信息,并将其做为进行流场主动控制的基础数据。本文研究了控制流向速度对流场的影响,分析了采用主动控制方法后,流场中涡量、压力、速度等参数的变化规律。通过对施加扰动后壁面摩擦系数和对流换热系数的分析,得出了控制流向速度对流场的影响规律。为研究控制不同方向速度对流场所产生的影响,本文还研究了施加法向速度扰动对整个流场所产生的影响。通过分析不同扰动速度和不同空间位置的扰动对壁面摩擦系数和对流换热系数的影响,得出了流场扰动对温度场影响的基本规律。通过对流场主动控制的数值模拟,为流场主动控制技术提供了一定的理论依据,有助于今后在实际工程中加以应用。更多还原

【Abstract】 The combination of the technology of MEMS and flow control gradually makes the application of active flow control technology feasible and accelerates the progress of active flow control technology. The fundamental principle, the key technology and the mechanism that how and where MEMS could be used in active flow controls are discussed briefly in this thesis. The progress in the active flow control based on the technology micro-sensor, the micro-controller, the micro-actuator and the integration technologies are also introduced in the paper.In this thesis, the two-dimensional numerical simulation in the rectangle channel is carried out using LES, from which the information of the flow field is obtained. The active control is implemented based on these data. The effect of the velocity along the direction of the flow on the whole flow field is studied. And how the parameters in the eddy, the pressure and the velocity will vary after the active control is taken. By the analysis of the coefficients of the wall friction and convection heat transfer, rules of taking control of the velocity along the flow are found.In order to investigate the influence of velocity in different directions to the flow field, the effect of the velocity perturbation normal to the flow direction on the whole flow field is studied. By the analysis of the coefficients of the wall friction and convection heat transfer with different velocity perturbation at different special position, the basic regulation of how the perturbation in the flow field will affect the temperature field is obtained.Through the numerical simulation of the active flow control, some theoretical foundations to the study of the active control in the MEMS technology are provided, which is helpful in the practical projects.更多还原