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레이저 2선 굴절법을 이용한 정적연소실에서 예혼합기의 연소속도 측정
배충식,김정민 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2
Burning velocities of propane-air mixtures were experimentally investigated in a constant-volume combustion chamber. The propane-air mixture was prepared by controlling partial pressures. Flame propagation process was observed as a function of mixture strength. A spherical combustion chamber contains a pair of parallel windows through which optical access into the chamber can be provided. Laser two beam deflection method was adopted to measure the local flame propagation, which gave information on the flame size and flame propagation speed. Pressure development was also measured by a piezoelectric pressure transducer to characterize combustion in quiescent mixtures. Burning velocity was calculated from flame propagation speed and pressure measurements. In this experiment, the values of flame speed are within totally 1.1% error range including 0.5% location error and 1% visual error. Laser two beam method was found to be feasible in measuring flame propagation in that the measured values are comparable to the available data in literatures.
배충식 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
Electrical characteristics and ignitabilities of propane-air premixed mixtures in a cylindrical constant-volume combustion chamber were investigated. The voltage and current of ignition were measured while the geometry of spark plug, ignition system, mixture strength, initial mixture pressure and temperature were varied. The higher the initial mixture pressure was and the lower the initial mixture temperature was, the higher the breakdown voltage to the mixture in the spark gap. The higher the spark gap width was, the higher the breakdown voltage, maximum current and released total electrical energy. The TCI system with its longer spark duration and higher breakdown energy allowed extension of the lean ignition limit. The ignitability was also improved with larger gap width and with V-grooved spark plug and thin-tipped spark plug.
Improved Optimization of Indirubin Production from Bioreactor Culture of Polygonum tinctorium
Chung, Choong Sik,Kim, Kyung Il,Bae, Geun Won,Lee, Youn Hyung,Lee, Hyong Joo,Chae, Young Am,Chung, In Sik 한국응용생명화학회 2000 Journal of Applied Biological Chemistry (J. Appl. Vol.43 No.2
Effect of the two-stage operation and cell concentration on indirubin production was investigated using bioreactor culture of Polygonum tinctorium. Two-stage culture was operated successfully for 110 days without any adverse effects on continuous indirubin production. Maximum indirubin concentration was found to be at 80 mg/bioreactor. Initial cell concentration significantly affected indirubin production. The indirubin production at 29.2% PCV was improved by 845%, compared to that at 5% PCV. For high-density bioreactor culture of P. tinctorium, a maximum production rate of 10.2 mg indirubin/L day was obtained. Indirubin recovery for bioreactor operation was also examined using XAD-2, XAD-4, XAD-7, and solid silicon. XAD-4 was 1.6-fold more effective than that for solid silicon in indirubin recovery.