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과농-희박 층류 예혼합화염의 안정화에 관한 실험적 연구
이원남,서동규 단국대학교 2001 산업기술연구 Vol.2 No.-
The stabilization of fuel-rich/lean laminar premixed flames has been studied experimentally using a slot burner. Fuel-rich flames hold the fuel-lean flame and suppress the flame blow-out phenomena. At the presence of fuel-rich flames, the tip of the fuel-lean flame remains closed even at equivalence ratios below the lean flammability limit. It was demonstrated that fuel-rich flames could stabilize the fuel-lean flame for the equivalence ratio as low as 0.2. The increase of heat release rate of the fuel-rich flame lowers the equivalence ratio limit of the stable fuel-lean flames. The stability of fuel-lean flames, however, is not sensitive to the equivalence ratio of fuel-rich flame. The mechanism that is responsible for the flame stabilization appears to be similar to that of a triple flame.
이원남 대한기계학회 1993 大韓機械學會誌 Vol.33 No.12
연소현상에 대한 이해를 증가시키기 위하여 화염을 이용한 많은 실험적 연구가 이루어져 왔다. 특히 연소 모델의 개선과 증명을 위하여는 화염에서의 성분 농도 측정이 필수적이며, 최근에 들어 측정 가능해진 래디컬성분의 측정은 연소해석분야에 많은 진전을 가져왔다. OH, H 및 O는 연료의 분해 (decomposition) 및 연소 산화물생성 이외에도 CO와 NO 같은 공해물질의 형성등 연소과정에서 매우 중요한 래디컬들이며, 특히 화염영역에서의 OH의 전파(transport)는 화염의 점화 및 안정성 (stability)에도 큰 영향을 미친다. OH래디컬은 연소과정에서 가장 중요한 성분 중 하나이며, 또한 스펙트럼이 비교적 잘 알려져 있어 레이저 유도 형광의 적용이 용이하므로 화염에서의 OH농도 측정에 LIF(laser induced fluorescence) 또는 PLIF(planar laser induced fluorescence)가 널리 사용되고 있다. 따라서 LIF 및 PLIF의 원리 및 연소분야에서의 응용을 OH농도 측정을 중심으로 소개하고자 한다.
발달장애 성인자녀를 위한 부모의 평생계획 수립에 관한 연구
이원남 ( Won Nam Lee ),김경신 ( Kyeong Shin Kim ) 한국가족관계학회 2014 한국가족관계학회지 Vol.19 No.1
This study was conducted in order to examine the influence of sociodemographic characteristics, family resilience, self-help groups characteristics of families with the disabled on the establishment of permanency planning targeting the parents of adult children with developmental disabilities. The structured survey was conducted targeting 264 parents of children with developmental disabilities over the age of 18 years old in Gwangju and Jeollanam-do. Using SPSS 18.0 the data frequency, percentage, t-test, ANOVA and hierarchical regression analysis were conducted. The major findings were as follows: First, the need of permanency planning for adult children with developmental disabilities which their parents recognize was shown high. However, the readiness of the permanency planning for the disabled children was shown generally low. Second, the functional level of daily life, family resilience, the level of care giving burden, family income and supports from self-help groups were identified as statistically significant predictors for the level of permanency planning. The implications of those results were discussed.
연료에 따른 층류 예혼합화염의 CH* Chemiluminescence 신호특성 변화
이원남(Wonnam Lee),강석민(Sukmin Kang) 한국연소학회 2008 한국연소학회지 Vol.13 No.2
The CH* chemiluminescence of premixed flames and their dependency on fuel types has been experimentally investigated on laminar methane and propane premixed flames. The measured chemiluminescence intensities are observed linearly proportional to the fuel flow rate, which could be interpreted as the CH* chemiluminescence signal is linearly proportional to the heat release rate under fuel lean conditions. The effect of equivalence ratio could be expressed by an exponential function as ICH*∝α₁ exp(?₁Φ), where α₁=0.00054 and ?₁=4.60 for methane and α₁=0.0056 and ?₁=5.02 for propane. Oscillating flames showed the temporal fluctuation of chemiluminescence intensity: however, the time averaged values are virtually identical to those of quiescent flames under the same fuel flow rate and equivalence ratio conditions. This observation suggests that there is no significant flame stretch effect on chemiluminescence intensity, in average values.