Optimisation of a two-head lean prevaporised premixed combustor

As part of the European Brite Euram Low Emisson Combustor Technology programme, a two-head combustor sector, designed by SNECMA and ONERA, that includes an LPP main zone and an RQL pilot zone within the same volume, was tested at ONERA. A significant 50% reduction in NOx emissions was recorded for a pressure, air inlet temperature and fuel air ratio of 7 bar, 750 K, and 2.4%, respectively. The optimisation of each combustor component allowed to understand the phenomena and to identify solutions to the main difficulties associated with this new concept.