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RISS 인기검색어
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- 저자 : 이중엽(J. Y. Lee) (검색결과 4 건)
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순간압력강하치의 통계적 해석을 통한 경사관내 2상유동양식의 판별
이상천,이정표,김중엽,Lee, S.C.,Lee, J.P.,Kim, J.Y. 대한설비공학회 1988 설비저널 Vol.17 No.5
Characteristics of flow regime transitions in inclined upwards gas-liquid two-phase flow have been investigated based upon a statistical analysis of instantaneous pressure drop curves through an orifice. The probability density functions of the curves indicate distinct patterns depending upon two-phase flow regime, which are very similar to those of horizontal two-phase. The dimensionless intensity of fluctuations of the pressure drops sharply change as the flow transitions such as plug-slug, pseudo slug-slug and annular-slug take place. The effects of inclination angle on the flow regime transitions have been also investigated. The results show that the method to identify the flow pattern based upon the statistical analysis of instantaneous pressure drops is suitable for inclined flow as well as horizontal flow.
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이상천,이정표,김중엽,Lee, S.C.,Lee, J.P.,Kim, J.Y. 대한설비공학회 1988 설비저널 Vol.17 No.4
The characteristics of flow pattern transitions in a horizontal cocurrent gas-liquid flow have been investigated by means of a statistical analysis of instantaneous pressure drop curves at an orifice. The dimensionless intensity of pressure drop fluctuation shows a sudden change during the course of flow transitions, indicating that it may be a good measure to identify the flow regime transitions. The probability density function of the curves feature a unique pattern depending upon the flow regimes and the statistical properties of the PDF also have particular ranges for each flow regime. In conclusion, the statistical analysis of instantaneous pressure drops may be a powerful tool for predicting the flow regime transitions.
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이중엽,황호연 울산대학교 1998 공학연구논문집 Vol.29 No.2
개념 및 기본설계 과정에서 필요한 헬리콥터 로터깃의 진동해석 및 원심력 강도해석이 수행되었다. 구조물은 보(beam) 형태의 유한 요소로 모델링 하였으며 먼저 회전하지 않는 로터깃 모델의 진동해석에 관한 연구를 수행하여 진동실험값과 비교할 수 있는 기틀을 마련하였다. 경계조건의 불확실성을 고려하여 로터근(root) 부분의 강성을 변화시켜 진동해석을 수행하는 민감도 해석도 병행하였다. 또한 로터깃 자체가 회전하는 물체이므로 특정 회전수에서 구조물이 원심력에 견딜 수 있는지를 분석하는 원심력 강도해석을 수행하였다. 해석 소프트웨어로는 MSC NASTRAN for Windows를 사용하였다. Vibration analyses and centrifugal strength analyses of rotor blades were performed that are necessary in conceptual and preliminary design phases of the helicopter design. Beam type finite elements were used for the structural modeling and first, vibration analyses of non-rotating blades were accomplished for the basis of comparision with the vibration test data. Sensitivity vibration analyses that change stiffness parameters at the blade root were also performed in favor of counting uncertain boudary conditions. Since rotor blades are rotating objects, to check the capability of standing centrifugal forces at the specific rotating speed, axial strength analyses were also performed. MSC/NASTRAN for Windows software was used for these analyses.
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