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Vorticity contours showing concentrated tip vortex without actuation (left) and diffused tip vortex due to wing tip plasma actuation (right) In summary, the two proposed novel plasma actuation flight control concepts worked well in wind tunnel experiments and represent highly promising and improved alternatives to currently used flight control systems. Committed to Plasma Actuator Technology Since establishing the first research program for plasma actuation in Canada in 2006, Dr Vo and Dr Mureithi continue to be leaders in the field of plasma actuation in aeronautical applications. In fact, the work discussed here gives just a few of the applications they have been studying. The team has also been looking at new plasma actuation concepts for improving the performance and efficiency of aircraft engines and in controlling flow-induced vibrations. Since 2007, Dr Vo has proposed and investigated a novel concept whereby a plasma actuator is placed in the compressor of an aircraft gas turbine engine to suppress aerodynamic instabilities, thus allowing the engine to operate at peak efficiency without fear of engine stall. The concept was patented in 2012 and has been demonstrated on both axial and centrifugal compressors in research published in 2016. Dr Vo and Dr Mureithi have introduced plasma actuation technology to the National Research Council Canada (NRC) Gas Turbine Laboratory, with whom they have subsequently collaborated in flow control projects involving plasma actuation in aircraft engine intake ducts, compressors, combustion chambers and turbine ducts to reduce engine noise, weight, length, mechanical complexity and NOx emission. Dr Mureithi has also been investigating the fundamental problem of the stability and bifurcation behaviour of complex flows under controlled excitation. Flow stability control capability using plasma actuators can potentially lead, for instance, to a new approach to noise control. Last but not least, Dr Vo has also been working on improving plasma actuator models for simulations of new flow control concepts and on experimentally characterising plasma actuator performance at high pressure and temperature for future applications in aircraft engines. Indeed, plasma actuation-based systems offer a simpler, lighter, robust and low-cost solution to improving aircraft flight control and propulsion, and this has been clearly demonstrated in Dr Vo and Dr Mureithi’s various research projects. With further tweaking, plasma actuation will undoubtedly be used in future aircraft to improve their performance, resulting in cheaper acquisition and operating costs as well as lower pollution – benefits that could ultimately be passed onto the general public and to the environment. WWW.SCIENTIA.GLOBALPDF Image | Improving Aircraft Performance with Plasma Actuators
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