Five technologies designed to improve aeroengine performance including high-temperature electromagnetics and boundary-layer manipulation are the focus of a pan-European project.
One goal of the 17-partner research programme is to examine the use of boundary-layer control with engine intakes. The work will focus on the location, distribution and size of holes used for the suction and blowing devices that would be used. “The concept came from the airframers. They have experience of boundary-layer manipulators on wings. We will use it to improve airflow around and into the intake,” says Rolls-Royce mechanical sciences specialist John Webster, speaking at the launch of the UK’s Smart Materials Network on 19 January.
The three other technologies being investigated are microelectromechanical systems, shape-memory alloys and electromagnetic vibration control. Shape-memory alloys are being used in chevrons that extend into the engine efflux to help mix exhaust and ambient airflow to reduce noise. At cruise altitudes the chevrons change shape and move out of the exhaust flow to reduce drag.
The research is being conducted in a four-year €6.4 million ($7.72 million) European Union Sixth Framework programme called Advanced Actuation (ADVACT), which started in 2004 and will end in June 2008. Co-ordinated by
R-R, ADVACT’s 16 other partners include Avio, MTU and Snecma as well as German and UK universities and France’s Onera.
ROB COPPINGER / LONDON
Source: Flight International
