Experiment on flow field and thrust induced by plasma actuators

为了深入了解等离子体激励器流动控制原理,采用PIV技术获得了静止空气中的等离子体激励器上表面诱导气流及其末端引射气流流场的流速分布和流态,并对由此产生的诱导推力进行了测量实验;研究了等离子体激励器上表面诱导气流加速机理和尾部流场形态以及电极对数对诱导气流加速的影响,并与推力实验结果进行比较。研究结果表明,等离子体激励器上表面空气被诱导产生定向流动,并在多对平行电极的作用下被逐渐加速;诱导气流在激励器末端的引射作用形成射流,增加等离子体激励器电极对数可以增大该射流的流速;所产生的诱导推力也随诱导气流流速的加速相应增大。The velocity distribution and flow pattern of the induced flow on the surface and in the downstream of the plasma actuator were obtained by PIV technique in the still air and the induced thrust produced by the flow also was measured with an electronic balance.The mechanism of the induced flow on the actuator surface was investigated.The effect on accelerating the induced flow by the electrode number was compared with the induced thrust measured.The results show that the air flow induced on the plasma actuator is directional to form a jet in the downstream edge of the actuator and the flow is gradually accelerated by the electrodes parallel in both side of the actuator.Both the jet velocity and the induced thrust increase with adding electrode number.福建省自然科学基金(2010J01014

环氧/碳化硅复合材料的制备和导热性能研究

碳化硅纳米线(SiCNWs)具有导热系数高、热稳定性好、力学性能及耐腐蚀性优异等优点,是提高环氧树脂复合材料导热性能的理想填料。通过对SiCNWs高温氧化使纳米线表面形成二氧化硅(SiO_2)的壳层得到核壳结构的碳化硅纳米线(SiC@SiO_2NWs),对比研究了SiCNWs和SiC@SiO_2NWs对环氧(Epoxy)复合材料热性能的影响。结果表明:Epoxy/SiC@SiO_2NWs复合材料的导热系数达到0.391W/(m·K),相比纯环氧提高了79.4%,同时提高了其热稳定性