http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
저공해 버너에서의 운전조건에 따른 미분탄 분배특성에 관한 수치해석 연구
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),박호영(Ho Young Park),서상일(Sang Il Seo) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.5
국내에서 널리 사용되는 500 MW급 미분탄 화력발전에서 2개의 PM (pollution minimum) 버너의 최적 운전 범위를 확인하기 위하여 DPM (discrete phase model)을 활용하여 수치계산을 수행하였다. 본 연구는 저가의 아역청탄의 활용 증진을 위하여 다양한 조건에서 탄 종별로 연구를 수행하는데 그 목적이 있다. 탄 종별로 미분탄의 질량 유량, 1차 공기의 질량 유량, 그리고 미분탄의 입자 크기 분포를 달리하여 공기/석탄의 분배비의 영향을 조사하였다. 이러한 매개변수에 관하여 PM 버너에서의 공기/석탄의 분배비의 최적운전조건을 도출하고 이에 대해 논의하고자 한다. We performed numerical simulation using a DPM (discrete phase model) to identify the optimal operation ranges in two representative PM burners widely used in domestic 500-MW pulverized coal-fired power plants. Recently there has been an increased utilization of low-cost coals such as sub-bituminous coal. We investigate the effects of coal blends on the distribution ratio of coal to air by varying the mass flow rates of pulverized coal and primary air and the particle size. We present and discuss optimal conditions for the distribution ratio of coal to air in PM burners.
윤성환 ( Yun Sung-hwan ),박창호 ( Park Chang-ho ),윤완석 ( Yoon Wan-seok ),박양흠 ( Park Yang-heum ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.2
본 연구는 고정하중 효과를 고려한 교량받침 앵커부 콘크리트의 파괴강도 평가 및 평가식 제안에 관한 연구이다. 고정하중이 작용되면 마찰력에 의해 수평 지진하중이 분산되는 효과가 발생되며, 압축력에 의한 구속효과로 앵커부 콘크리트 저항성능이 향상된다. 이를 검증하기 위해, 구조실험 및 수치해석이 수행되었고, 고정하중비 50%, 100%, 200%일 때 70% 이상 파괴강도가 증가되는 것으로 나타났으며, 고정하중 효과를 고려한 내진성능평가식을 제안하고자 한다.
윤성환(Sung-Hwan Yoon),안희락(Hee-Rak Ahn),문희성(Hee-Sung Moon),최규영(Gyu-Yeong Choe),이병국(Byoung-Kuk Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
본 논문에서는 배터리 시스템에서 각 파라미터가 시스템에 미치는 영향을 분석하였다. 이를 위해 몇 가지 배터리 모델을 선정하였으며 모델별로 다양한 변화를 주어 시뮬레이션을 수행하였다. 시뮬레이션의 결과를 바탕으로 파라미터 특성에 대한 분석을 하였고 그 결과를 바탕으로 다양한 모델에 적용, 분석함으로써 타당성을 검증하였다.
윤성환(Yoon, Sung-hwan) 국방부 군사편찬연구소 2015 군사 Vol.- No.95
As we have seen, the daedaero(大對盧) in late Goguryeo was the highest position of an official rank and government office. However, unlike the conventional understanding, the daedaero was multiple as official rank. It was told the daein(大人) or tojol(吐?) to distinguish with a government office daedaero in the middle of the 7th century. Also, numerous daein"s could take office in as government office daedaero. It was elected through the meeting of daein"s(大人會議). The meeting of daein"s was composed of the daein"s, discussed the election and re-election of a daedaero. This conference, which is run by council system of all members, certified the daedaero as representatives of daein society. This fact indicates that Yeon Taejo(淵太祚), the father of Yeon Kaesomoon(淵蓋蘇文), was served as official rank the daedaero(=daein, tojol) and as government office daedaero. Yeon Kaesomoon inherited the daein from his father. Nobilities" counsel system in late Goguryeo operated the meeting of daein"s and the council of five offices(五官會議) as conference system. The meeting of daein"s tuned political dynamics inter nobilities. While the council of five offices(五官會議) was to administrate state affairs. Dual operation of the conference system of nobilities was to prevent possibility that power struggle of nobilities spread over affairs of state. Also, king could not intervene the meeting of daein"s. king do not carry out as higher power in that case. And the existence of the meeting of daein"s make some nobilities monopolizing the positions as government office daedaero. Therefore, the meeting of daein"s was also in a sense privileged authority.
하향 전파하는 예혼합 화염의 이차 열음향 불안정성에 미치는 화염면적 변화의 영향
윤성환(Sung Hwan Yoon) 한국연소학회 2020 한국연소학회지 Vol.25 No.1
The effects of varying flame surface area due to hydrodynamic instability on secondary acoustic instability in downward propagating flames were studied experimentally. To quantitatively control hydrodynamic instability, one of intrinsic combustion instabilities, CO₂ laser irradiation technique was adopted. Because of the increase in flame surface area of the flame surface area artificially, the transition from primary acoustic instability to secondary acoustics instability occurred, and the occurrence time of secondary acoustic field became relatively shorter when the rate of variation in flame surface area was increased. However, the rate of variation in flame surface area and the wave number of corrugated structure were found to have little effect on the growth mechanism of secondary acoustic instability.
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),김정수(Jeong Soo Kim) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Characteristics of lift-off propane flames diluted with nitrogen have been investigated experimentally to elucidate flame oscillations. Flame stability maps are compared for the fuel tube diameters of 0.3 and 1.0㎜ to clarify the flame oscillations. Flame oscillation modes are classified into three: a pure self-oscillation, a combined form of self-oscillation and buoyancy-induced oscillation, and a combined form of self-oscillation and diffusive-thermal instability. It is shown that the self-oscillation is not relevant to a diffusive-thermal instability and a hydrodynamic instability caused by buoyancy, and appears at all lifted flame conditions irrespective of fuel Lewis number. These experimental evidences are displayed through the analysis of power spectrum for temporal variation of lift-off height. The possible scenario of the self-excitation mechanism is also addressed.
층류제트 부상화염에서 열손실에 의한 자기진동에 관한 연구
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),김정수(Jeong Soo Kim),배대석(Dae Seok Bae),윤진한(Jin Han Yun),길상인(San in Keel) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.3
질소 희석된 프로판 부상화염에서 열손실에 의한 자기진동을 기초로 화염안정화선도를 도출하기 위하여 노즐직경 0.3 ㎜, 1.0 ㎜에서 실험적 연구를 수행하였다. 예혼합화염에서 확산화염으로의 전도 열손실에 의한 자기진동 및 매연 복사에 의한 자기진동을 관찰하였다. 0.1 ㎐보다 낮은 주파수 성향을 띄는 열손실에 의한 자기진동은 제안된 메커니즘에 의해 잘 묘사되었고 반면 매연복사에 의한 자기진동은 O(0.1 ㎐)의 주파수 범위를 나타내었으며 제안된 메커니즘은 항온항습실 실험을 통해 입증하였다. 질소 희석된 프로판 부상화염에서 관찰된 열손실에 의한 자기진동의 특성화는 관련된 변수 및 스트라훌 수에 의해 잘 묘사되었다. We experimentally investigated lifted propane jet flames diluted with nitrogen to obtain flame-stability maps based on heat-loss-induced self-excitation. We found that heat-loss-induced self-excitations are caused by conductive heat loss from premixed flame branches to trailing diffusion flames as well as soot radiation. The conductive-heat-loss-induced self-excitation at frequencies less than 0.1 ㎐ is explained well by a suggested mechanism, whereas the oscillation of the soot region induces a self-excitation of lift-off height of the order of 0.1 ㎐. The suggested mechanism is also verified from additive experiments in a room at constant temperature and humidity. The heat-loss-induced self-excitation is explained by the Strouhal numbers as a function of the relevant parameters.