<p>A modified gas–liquid mixing impeller, termed the dynamic gas distribution turbine, has been developed to address clogging issues in gas distributors and to meet the market demand for large-diameter impellers. The power number, relative power requirement, and gas holdup were determined through experimental measurements. Additionally, an unstable gas dispersion phenomenon, intermittent gas flooding, was observed in both experimental and simulation studies. Simulated gas stream traces indicate that the interaction between the aeration gas from the gas channel and the liquid drawn in through the suction port adversely affects gas dispersion. This interaction is considered the trigger for gas flooding. Based on this instability mechanism, the impeller was modified to reduce the gas velocity at the gas channel outlet and to shorten the distance between the gas channel outlet and the blade back. Experimental results confirmed the elimination of intermittent flooding.</p>