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The main objective of this Low Nox III part 1 European programme (and the linked on-going programme Low Nox III part 2) was to demonstrate low NOx emission technologies in both modular and full scale combustors that are representative of the size and operating conditions of large and small engines. An ambitious target of 60% of NOx emission reduction was defined, based on current 1996 ICAO regulation levels (CAEP2). In addition, a Focused Generics activity was a part of the programme and enabled the development and validation of new analytical tools, technologies and advanced design concepts. Finally, an Advanced CFD activity was included in order to define CFD methods for evaluation of test results and for optimisation of the different combustors.

Many LPP injector systems were developed and tested. The Nox reduction objectives were met in the cases of small and medium size engines. Unexpected difficulties arose for large engines at high pressure (severe instabilities) but partial results on the LPP modules were nevertheless encouraging. The focused generic theme provided rich results on some fundamental topics: 2-phase flow, spray characterisation, measurement, auto-ignition, flash-back, mixing. In the Applied CFD theme, the project provides improvements on evaporation models, combustion modelling and prediction of CO, NOx modelling, turbulence for swirling flows, and internal measurements of radiative heat load.

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