Experimental Study of Hydrogen Addition Effects on a Swirl-Stabilized Methane-Air Flame

摘要: The effects of H2 addition on a premixed methane-air flame was studied experimentally with swirl-stabilized gas turbine model combustor. Experiments 0%, 25%, and 50% molar fraction in the fuel mixture were conducted under atmospheric pressure. primary objectives are to study impacts lean blowout (LBO) limits, shapes anchored locations, flow field characteristics, precessing vortex core (PVC) instability, as well CO emission performance. LBO limits identified by gradually reducing equivalence ratio until condition where physically disappeared. time-averaged CH chemiluminescence used reveal characteristics stabilization, e.g., structure stabilized locations. In addition, inverse Abel transform applied results so that distribution signal symmetric plane obtained. particle image velocimetry (PIV) detect frequency 2 kHz. snapshot method POD (proper orthogonal decomposition) fast Fourier (FFT) adopted capture most prominent coherent structures turbulent field. monitored an exhaust probe installed close combustor exit. experimental indicated extended operation range low emission. influence shape, location, observed. With assistance FFT, combustion suppression PVC found.