Rolls-Royce’s demonstrator engine, featuring a new lean-burn and low-emissions combustion system for future jet engine programmes, has started icing tests. The ALECSys (Advanced Low Emissions Combustion System) demonstrator successfully started the tests in Manitoba, Canada, at temperatures of -20°C, one month after its first ever test run in Derby. By constantly monitoring environmental conditions and the pilot’s thrust requirement, ALECSys alters the mixture of fuel and air delivered to various injection points to minimise NOx and other emissions. Tests have so far shown a halving of NOx at cruise, compared to today’s levels. Andy Geer, Rolls-Royce, Chief Engineer and Head
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