Seoul National University · Engineering
Professor Youngbin Yoon's research lab specializes in combustion science and fluid dynamics, with a focus on turbulent non-premixed jet flames, particularly those involving hydrogen and syngas (H₂/CO) fuels. The lab investigates fundamental combustion phenomena such as flame blowout limits, flame stabilization, and NOx emissions under various flow and injection conditions. Key research directions include the effects of orifice internal flow on liquid jet breakup, flame dynamics in supersonic crossflows, and the scaling of NOx emissions based on residence time and fuel composition. The work has strong applications in gas turbine and combustor design, aiming to improve efficiency and reduce emissions.
Figures are computed from collected data and may differ slightly.
The effects of orifice internal flow, such as cavitation and hydraulic flip, on the breakup processes of the liquid jet injected perpendicularly into subsonic crossflows were studied experimentally. Orifice diameters, injection pressure differentials, and the shapes (sharp and round) of the orifice entrance were varied to provide several conditions for orifice internal flow. Photographs of liquid flow inside the orifice confirmed the internal flow condition. The liquid column breakup lengths, an
Abstract An extensive set of flame blowout limit curves has been measured for the case of a hydrogen jet flame surrounded by a heated, supersonic, coflowing air stream and some ideas are proposed to explain the observed trends. The stagnation temperature of the Mach 2.2 air stream was varied from 294 K up to the autoignition temperature of 900 K; hydrogen injection velocities were varied up to 1191 m/s. It was found that the flame blowout curves display two distinct stable regions which are boun
Peer Reviewed
Abstract NOx emission characteristics and EINOx scaling of hydrogen and H2/CO syngas non-premixed jet flames under turbulent condition are investigated. Flame length and NOx concentration were measured simultaneously for four different syngas compositions (100/0, 75/25, 50/50, and 25/75 H2/CO% vol.) and three different fuel nozzle diameters (2.5, 3.0, and 3.5 mm). The jet flames were in the buoyancy-momentum transition regime. NOx emission is reduced with increased Reynolds number and increased
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