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김유택,다나카카즈히로,이영호,Kim, You-Taek,Tanaka, Kazuhiro,Lee, Young-Ho 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.4
A screw-type centrifugal pump was manufactured to carry primarily solids and its impeller had a wide flow passage. However, there was an effect on the flow passage shape on delay of the choke due to entrained air not being clarified yet. Moreover, because its impeller has a particular shape, only few studies have tried to clarify the pump performance and details of internal flow pattern of that pump. For this reason, we carried out the pump performance experiment under air-water two-phase flow condition with different impeller tip clearances, pump rotational speeds and void fractions by using a small screw-type centrifugal pump designed to acquire basic data. In a general centrifugal pump, it was reported that there was a loss of pump head from single-phase flow to the choke due to air entrainment near the best efficiency point being large. However, the loss near the best efficient point in a screw-type centrifugal pump became less than that in a general centrifugal pump.
김유택,최민선,이영호,Kim, You-Taek,Choi, Min-Seon,Lee, Young-Ho 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.3
It is reported recently that the pump head deterioration near the best efficiency point, from single-phase flow to the choke due to air entrainment became less in a screw-type centrifugal pump than in a general centrifugal pump. Moreover, at a narrow tip clearance, the pump head became partially higher in two-phase flow than that in single-phase flow. However, the internal pressure fluctuations on this pump due to air entrainment have not been studied yet. For that reason, we have examined the influences of void fraction, flow coefficient and impeller tip clearance on pressure fluctuations in the casing. The void fraction became larger, the influence of tip clearance on pressure distribution became less.
공기 흡입이 소형 스크류식 원심펌프의 특성에 미치는 영향
김유택,다나카카즈히로,이영호,마쯔모토요이치로,Kim, You-Taek,Tanaka, Kazuhiro,Lee, Young-Ho,Matsumoto, Yoichiro 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.3
In a screw-type centrifugal pump, the pump head deteriorates from single-phase flow to the choke due to an increased air entrainment at a wide tip clearance compared to that of a narrow tip clearance. Moreover, at a narrow tip clearance, the pump head became partially higher in a two-phase flow than that of a single-phase flow near the best efficiency point in low void fraction region. Therefore, we observed the internal flow pattern by using a stroboscope and we measured the mean size of bubbles from the images obtained with a high speed camera. Then, we investigated the influences of the mean size of bubbles, tip clearances and flow patterns on pump performance.
김유택,남청도,이영호,Kim, You-Taek,Nam, Chung-Do,Lee, Young-Ho 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.4
Pumps arre used extensively for transporting fluid in many ships. However, the present state of pumps used in the large merchant ships has not been studied. In this paper, we have reported the general description of the operating pumps according to the different ship types(Bulk, Container, Car-Carrier, Tanker, LNG). Moreover, the pump total powers are compared with the main engine Normal Continuous Rating power and the pump total weights are also compared with the ship deadweight.
해양온도차발전 Closed and Regeneration Cycle의 기본 정특성
차상원(Sang1Won Cha),김유택(You1Taek Kim),이영호(Young1Ho Lee) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11
Ocean Thermal Energy conversion(OTEC) technology is one of OTEC technology refer to a mechanical system that utilizes the natural temperature gradient that exists in the tropical ocean between warm surface water and the deep cold water, to generate electricity and produce other economically valuable by-products. The selection of working fluid and working conditions of the OTEC’s cycle has a great effect on the system operation, and it’s energy efficiency and impact on the environment.Working fluids of the OTEC is Ammonia, R22, R407c, R410a. Ammonia have a large heat capacity. But, ammonia is difficult to treat. R22 has been proposed as the working fluid instead of ammonia due to toxicity problems, it would be prohibited according to the Montreal Protocol. Therefore, more research is needed on developing more suitable working fluid substitutes. It is a R407c, R410a. In this paper, the optimization of and Ocean Thermal Energy Conversion(OTEC) system is carried out by the Powell method (according to the Workin g Cycle and Working Fluids).
Hysys를 이용한 50㎾급 선박 배기폐열회수시스템 설계
김유택(You-Taek Kim),이경석(Kyung-Seok Lee),김도엽(Do-Yeop Kim),모장오(Jang-Oh Mo),오철(Cheol Oh),이영호(Young-Ho Lee) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
In plant, power generation has recently become popular, especially when the utility cost becomes high. However, conventional electricity generation is not always economically feasible for private industry due to its capital cost and source of high priced fuels. An important number of new solutions have been proposed to generate electricity from low and medium heat source. Among the proposed solutions, the Organic Rankine Cycle(ORC) system using a organic working fluid is most widely used. Waste Heat Recovery System(WHRS) is energy conversion technology that recovery the thermal energy of ship's exhaust gas and generate electric energy. The purpose of this study is to design the 50㎾-class electric generating system applied to WHRS for ship and to acquire the thermal design data for the heat cycle system using ASPEN HYSYS program. According to the simulation, the physical data was acquired at each component of the cycle.
김유택(You-Taek Kim),남청도(Cheong-Do Nam),강호근(Ho-Keun Kang),이영호(Young-Ho Lee) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
A screw-type centrifugal pump was manufactured to cany solids primarily and its impeller has a wide flow passage. However, the effect of flow passage shape on delay of the choke due to entrained air has not been clarified yet. Moreover, because its impeller has a particular shape, only few studies have tried to clarify the pump performance and details of internal flow pattern of that pump. For that reason, we carried out the pump performance experiment under air-water two-phase flow condition with different impeller tip clearances, pump rotational speeds and void fractions by using a small screw-type centrifugal pump designed to acquire basic data. In a general centrifugal pump, it was reported that loss of pump head from single-phase flow to the choke due to air entrainment near the best efficiency point was large. However, the loss near the best efficient point in a screw-type centrifugal pump became less than that in a general centrifugal pump.