A parameter study was conducted to characterize the combustion of a hydrogen-rich syngas fuel in swirl-stabilized flames in a gas turbine model combustor with optical access. Three thermal power-loadings were tested and equivalence ratio was varied in a range of 0.4 - 0.6 by changing the fuel flow rates at constant air flow. Velocity, heat-release and flame zone shape were studied using optical diagnostics including PIV, OH-LIF and OH* chemiluminescence imaging. A main goal of this work was the establishment of an experimental data base for the validation of numerical simulations. The syngas burned stably and without significant thermo-acoustic oscillations at all operating conditions. The inner recirculation zone is identified as a key stabilization mechanism for this burner. This is consistent with previous studies for syngas mixtures with a high CO content in the same burner. Changes in equivalence ratio and the thermal power of the flame had only a small impact on the overall flame shape and the burning behavior. 德國LaVision PIV/PLIF粒子成像測速場儀 PLIF平面激光誘導(dǎo)熒光火焰燃燒檢測系統(tǒng) Imager sCMOS PIV相機(jī)