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조주형,박준홍,전충환,안국영,김한석 한국수소및신에너지학회 2010 한국수소 및 신에너지학회논문집 Vol.21 No.6
The present study deals with experimental investigations on the syngas-oxygen combustion characteristics of a swirl-stabilized premixed flame in a 10 kW combustor. The effect of hydrogen in syngas has been investigated with different swirl angles to identify the role of hydrogen and swirl strength on the flame stability and CO emissions. The results show that hydrogen addition extended the blowout limit while narrowing the flashback limit. The dependence of blowout on the swirl angle is negligible while the dependence of flashback on the swirl angle is evidenced by two regimes depending on the amount of hydrogen. CO emission is decreased with increasing excess O2 supply or increasing hydrogen content. Chemiluminescence diagnostics is utilized to provide information on the structure of a swirl-stabilized premixed flame. The OH chemiluminescence intensity is more concentrated near the burner exit with an increase in the hydrogen content, which results from high reactivity of hydrogen.
조주형,이승주,최진주,정장호 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.2
Sensory characteristics and chemical properties of 9 commercial dongchimi (Korean watery radish kimchi) liquid varieties were investigated using sensory descriptive analysis and instrumental analyses. Dongchimi was analyzed for pH, titratable acidity, soluble solids, salinity, organic acids, sugars, ethanol, and amino acids. Arginine, glutamic acid, and proline were the key amino acids. Lactic acid was the main organic acid in mature dongchimi. Based on sensory descriptive analysis, 4 appearances, 10 odors, 5 flavor/ taste, and 3 mouthfeel sensory attributes were developed. Descriptive sensory and instrumental results showed that a white hue was associated with garlic, leek, and chili odors, glutamic acid, acetic acid, lactic acid, ethanol, and mannitol. Samples with a yellow hue were associated with turbidity, moldy and yeast odors, salty taste, fructose, glucose, and malic acid.
조주형 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.9
An analytical investigation was conducted to examine how the mass flow is distributed into multiple flow circuits with partial contractions in flow passages. It is usually considered by conventional practices in fuel supply system of gas turbines that the fuel flow distribution in multiple fuel circuits is determined by the opening area of staging valves. This study extends this conventional concept by considering the coupled effect of staging valves with burner nozzles. A two-branch flow system was demonstrated to illustrate how the mass flow is distributed by the opening of staging valves and burner nozzles, and vice versa, i.e., how the staging valve opening scenario should be implemented to satisfy a prescribed flow split schedule. The concept accounting for the coupled effect was then applied to the fuel supply system of an industrial gas turbine combustor with multiple burner nozzles to design an opening scenario of the fuel staging valves.