Direct numerical simulation of flame-wall interaction at gas turbine relevant conditions

A direct numerical simulation (DNS) with finite rate chemistry was performed to evaluate the main influences on carbon monoxide (CO) emissions in gas turbine combustion. lean methane/air mixture is burned fully turbulent jet flames a domain enclosed by isothermal walls. The formation of CO found be affected mean strain flow, flame-wall interaction (FWI), and interactions flame recirculation zones flow. production consumption differ strongly from reaction rates freely propagating flame. In upstream part domain, flow mainly affects formation, while wall heat loss oxidation process towards end where decreases. an optimal estimator analysis, relevant parameters that dominate are identified as local mass fraction YCO, loss, described enthalpy defect Δh, OH radical YOH. particularly influential close effects far negligible. Using parameter describes late-stage well entire domain. particular, YCO should not neglected at wall. YOH suited describe processes involved oxidation, it both parameterizes partner for oxidation. combination Δh able improve domain-averaged irreducible error almost half compared only progress variable. Adding set further reduced 25% original error.