A Preliminary Study of NO_X Emission of staging/Premixed and Prevaporized Lean Combustion Low Emission Combustor Scheme

Preliminary research results of NOX emission are presented for a scheme of staging/lean premixed and prevaporized (LPP) combustion.Conventional swirl cup with direct injection nozzle is employed for the primary stage, while a prefilm airblast atomizer with premixed prevaporized duct is equipped for the main stage.In addition,a dome swirler is fitted at the end of the duct for flame stabilizing.The main purpose of the study is to investigate the low emission capability of the premixed prevaporized lean combustion main stage. The properties of the fuel used in the test is RP 3 which is similar to JET A fuel.A single dome combustor was fabricated and NO_X emission investigation was carried out under operating conditions:high inlet temperature (800 K),inlet velocity and overall fuel/air ratio at the design point.The inlet air pressure is atmospheric.The results demonstrated that the NO_X emissions are reduced by 60% and the fuel staging ratio exerted significant influence on NO_X emission reduction.