Production of sulfate aerosol precursors in the turbine and exhaust nozzle of an aircraft engine

摘要: Recent in-flight measurements of aircraft engine exhaust have suggested much higher conversions fuel sulfur to sulfuric acid aerosols than can be explained by gas-phase oxidation within the plume. This paper describes effects turbine and nozzle aerodynamics chemical kinetics on production sulfate aerosol precursors in exhaust. Results from both one-dimensional (1-D) two-dimensional (2-D) numerical simulations are presented for a range flow chemistry conditions. One-dimensional calculations entire postcombustor path an advanced subsonic resulted up 6.3% through nozzle. were most sensitive species concentrations at combustor exit, exit temperature, cooling mass addition turbine. Two-dimensional representative demonstrated that intraengine fluid mechanics increase factor 3 across single blade row because cooling-induced temperature nonuniformities. Comparisons averaged 2-D results with 1-D same further showed while produce correct trends, magnitude change may underpredicted as 47% over if spatial nonuniformities field not included.