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- 저자 : Kangyeop Park (검색결과 5 건)
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이중 예혼합화염에서 CO<SUB>2</SUB> 희석이 연소불안정에 미치는 영향
이강엽(Kangyeop Lee),김형모(Hyungmo Kim),박부민(Poomin Park),황오식(Osik Hwang),양수석(Sooseok Yang),고영성(Youngsung Ko) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
최근 대두되고 있는 바이오가스(Biogas)를 이중 희박 예혼합 가스터빈 연소기에 적용하기 위한 연구로써, 기존 개발된 실물형 이중 희박 예혼합 연소기 버너헤드에 바이오가스 조성을 모사한 CO2 희석 연료를 사용하여, 가스터빈 연소기의 연소불안정에 미치는 영향을 연구하였다. 이중 스월이 적용된 이중화염에서 연료분배율(Pilot fuel mass fraction)에 따라 화염구조가 상이하며 이에 따라 연소장의 온도분포와 연소불안정 특성이 결정된다. 동압신호와 phase-resolved OH<SUP>*</SUP> 이미지를 통해 연료분 배율 변화와 CO2 희석률 증가에 따른 연소불안정 크기 감소와 그 경향을 알 수 있었다. CO2 희석에 의해 열방출 섭동의 크기가 감소하고 화염속도가 감소하며 이에 따라 화염면의 팽창 즉, 체적의 증가로 인해 연소불안정이 감소되는 것을 실험을 통해 확인하였다. The effects of CO2-dilution on combustion instability were studied in order to apply biogas in a dual lean premixed gas turbine combustor on a real-scale dual lean premixed burner head which is originally developed for Natural Gas fuel. Combustion instability is reduced by CO2 dilution effect according to the result of dynamic pressure signal and phase-resolved OH<SUP>*</SUP> images. The reason for this is that dilution of CO2 reduces heat release perturbation and increases flame volume due to reduction of the flame speed and expansion of flame surface.
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이강엽(Kangyeop Lee),김형모(Hyungmo Kim),박부민(Poomin Park),김영문(Youngmun Kim),양수석(Sooseok Yang),고영성(Youngsung Ko) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
This paper presents an experimental study on the combustion instability characteristics with focus on the variation of PF(pilot fuel mass fraction) in real-scale dual lean premixed combustor. Pressure perturbation and heat release rate was measured and the Rayleigh index was acquired through the dynamic pressure and phase-resolved OH<SUP>*</SUP> chemiluminescence images. From the result, we could understand the combustion instability characteristics with respect to the changes of equivalence ratio, volume flow rate and PF. In particular, combustion instability characteristics in a dual flame due to PF and the heat release rate change were understood by observing the flame structure variations. It was revealed that combustion instability strength has maximal value at PF 0.3, and minimal value at the PF where equivalence ratio of main burner and pilot burner becomes equal. The pressure oscillation frequency is lowest at minimal instability strength condition, and highest at maximal instability strength condition.
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전기추진 비행기용 하이브리드 추진시스템 패시브 전력제어 하드웨어 시뮬레이션
박부민(Poomin Park),이강엽(Kangyeop Lee),황오식(Ohsik Hwang),김영문(Youngmun Kim),김춘택(Chuntaek Kim) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
한국항공우주연구원에서 개발 중인 중형 전기추진 무인기의 추진시스템에 대하여 하드웨어 통합 패시브 전력제어 시뮬레이션을 수행하였다. 이 추진시스템은 태양전지, 연료전지 및 배터리를 통합하여 전력원으로 사용하는 하이브리드 시스템이다. 연료전지는 I-V 커브를 모사하는 모사기를 제작하여 사용하였으며, 나머지 구성품들은 실제 탑재품들을 사용하였다. 시험 결과 각 전력원들은 요구전력 변화에 대해서 고유의 특성을 보이면서 원활히 동작되며, 안정적으로 운전됨을 확인하였다. This paper describes on hardware simulation of passive power control of propulsion system for electric propulsion aircraft of KARI. The propulsion system uses hybrid power system that is composed of solar cell, fuel cell and battery. The fuel cell is replaces by simulator due to its difficulty in handling while the other components are the same as that will be used on board. As the result, reliable power supply for propulsion is confirmed and each power source is well operated showing its characteristics.
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김형모(Hyungmo Kim),이강엽(Kangyeop Lee),박부민(Poomin Park),황오식(Ohsik Hwang),양수석(Sooseok Yang),고영성(Youngsung Ko) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
Understanding flame structure and NOx formation characteristics of dual lean premixed combustor is critically important in combustor design and NOx emission performance data analysis, but is poorly understood. this problem is addressed via the study of NOx formation in actual gas turbine combustors operating on dual lean premixed natural gas/air. OH-chemiluminescence (308㎚ band filtered) methodology, direct flame temperature measurement by C-type thermocouple and two dimensional NOx measurement by gas analyzer was adopted for investigating flame structure and NOx formation characteristics. The parameters, pilot fuel mass fraction (fPF)and pilot air mass fraction(fPA),were developed to analyze the relations of each burner. These experiments focus on the effects of pilot fuel mass fraction(0~0.7), overall equivalence ratio(0.4~0.6), inlet temperature(573~653K) and residence time(0.43~5.22㎳). The results show that flames in each burner form and progress in the separated area; pilot flame forms in the pilot burner and has strong sharp edge, main flame forms from downstream of main fuel/air mixture jet due to relatively lower reaction rate than pilot flame and spreads out to fill the whole combustor chamber, even outer recirculation zone (ORZ). This experimental data clearly shows that the amount of NOx formed in a lean, homogeneous combustion system depends on the post-combustion temperature and is rarely affected by residence time.
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Jungwon Han,Kwisung Yoo,Dongmyung Lee,Kangyeop Park,Wonseok Oh,Sung Min Park IEEE 2012 IEEE transactions on very large scale integration Vol.20 No.3
<P>This paper presents a low-power, gigabit limiting amplifier (LA) for application to optical receivers that employ the negative impedance compensation technique not only to enhance the gain and bandwidth characteristics simultaneously, but also to allow low-voltage, low-power operations. Test chips of the LA were implemented in a standard 0.18-μ m CMOS process, demonstrating 2.5-Gb/s operation with 40-dB gain, 0.053-UI rms jitter for 2<SUP>31</SUP>-1 pseudorandom bit sequence inputs, 9.5-mV<SUB>pp</SUB> input sensitivity for 10<SUP>-12</SUP> bit error rate (BER), and 5.2-mW power dissipation from a single 1.2-V supply. The chip core occupies the area of only 0.25 × 0.1 mm<SUP>2</SUP> . The proposed LA was adopted to realize a low-power, gigabit optical receiver. Fabricated using the same 0.18-μm CMOS technology, the measured results of the optical receiver chip reveal 132.6-dB Ω transimpedance gain, 2.7-GHz bandwidth even with a large 1.5-pF input parasitic capacitance, -16-dBm optical sensitivity for 10<SUP>-12</SUP> BER, and 51-mW power dissipation from a single 1.8-V supply. The area of the whole chip is 1.75 × 0.45 mm<SUP>2</SUP>.</P>
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