Reduction of aerofoil self-noise by surface plasma technique

在航空航天工业中，一直非常重视升力部件，以实现高升力，低阻力和低噪音性能。该建议涉及一项为期18个月的实验研究，研究表面等离子体激励器作为主动边界层和尾流控制技术的应用，目的是减少翼型的阻力和后缘自噪声。将研究两种构型：（1）钝后缘翼型--其特点是将上级升力性能与高阻力和显著的音调噪声辐射结合在一起;（2）尖后缘翼型--其在高雷诺数流中通常产生宽带自噪声。这里调查的主要技术是相对较新的，但迅速扩大，表面等离子体执行器。表面等离子体激励器用于流动控制在工业应用中非常有吸引力，因为该技术具有高能量效率，具有快速响应，结构简单，可用于稳态和非稳态激励，并且在不工作时不产生轮廓阻力。所提出的研究旨在同时优化具有钝后缘和尖后缘的翼型的空气动力学和气动声学性能。这项研究的预期成果是广泛验证表面等离子体激励器作为一种相对新颖的技术，用于减少涡轮风扇发动机和机身等飞机部件产生的阻力和噪声的有效性。本研究之成果亦可应用于风力涡轮机产业及风扇家电产业。

In the aerospace industry, great emphasis is always placed on the lifting components to achieve high-lift, low-drag and low-noise performances. This proposal concerns an 18-month experimental study into the application of surface plasma actuators as an active boundary layer and wake control technique with the aim of reducing the drag and Trailing Edge self-noise of aerofoil. Two configurations will be investigated: (1) an aerofoil with blunt trailing edge - which characteristically combines a superior lift performance with high drag and significant tone noise radiation; (2) an aerofoil with a sharp trailing edge - which typically produces broadband self-noise in high Reynolds number flow. The main technology under investigation here is the relatively new, though rapidly expanding, surface plasma actuators. The usage of surface plasma actuators for flow control is very attractive for industrial applications because this technique is highly energy efficient, has a fast response, a simple structure, can be used for both steady and unsteady actuations and creates no profile drag when not in operation. The proposed research aims to simultaneously optimise the aerodynamical and aeroacoustical performances of aerofoil with blunt as well as sharp trailing edges. The expected outcome of this research is an extensive validation of the effectiveness of surface plasma actuator as a relatively novel technique for the reduction of drag and noise generated by aircraft components such as the turbofan engine and airframe. The outcome of this research is also transferable to the wind turbine industry and fan-based home appliance sector.