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원심 펌프의 설계를 위한 비속도에 따른 무차원 설계 변수의 설계 범위에 관한 연구
박무룡(Moo Ryong Park),오재민(Jae Min Oh),유일수(Il Su Yoo) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
The feasible range of design variables for centrifugal pumps have been investigated. The present study has suggested a searching procedure to find the feasible ranges using only non-dimensional parameters. The results in the typical specific speed region and the low specific speed region have been presented.
최범석,박무룡,황순찬,박준영,Choi, Bum-Seog,Park, Moo-Ryong,Hwang, Soon-Chan,Park, Joon-Young 한국유체기계학회 2004 한국유체기계학회 논문집 Vol.19 No.5
A turbo blower, driven by a high-speed blushless DC motor, was designed as a efficient substitute of a ring blower or a roots blower. Computational analysis and performance tests have been performed to investigate performance characteristics of the blower. Experimental measurements showed that the blower has a good stability margin. This paper gives an outline of design, computational flow analysis and performance test for aerodynamic evaluation of the variable speed turboblower.
임형수,최범석,박무룡,박준영,유일수,서정민,황순찬,윤의수,한상조,Lim, Hyung-Soo,Choi, Bum-Seog,Park, Moo-Ryong,Park, Jun-Young,Yoo, Il-Su,Seo, Jeong-Min,Hwang, Soon-Chan,Yoon, Eui-Soo,Han, Sang-Jo 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
본 논문은 산업현장에서 발생하는 폐열원을 이용하여 200kW의 발전을 하기위한 터빈의 개발에 관한 전반적인 과정이 제시되었다. 유기 랭킨 사이클에 적용되는 터빈은 세계적으로도 개발이 활발히 진행되고 있는 단계이며, 시장 성장에 관한 잠재성이 크다. 따라서 국내의 연구기관에서도 많은 관심을 가지고 연구가 진행되고 있지만 상품 개발까지는 아직 도달하지 못하고 있는 상황이다. 본 논문에서는 유기 랭킨 사이클에서 작동하는 200kW급 터빈을 개발 하는데, 사이클 해석을 바탕으로 비속도 분석, mean line 해석, 3차원 해석 과정이 설명되었다. 그리고 해석 결과를 바탕으로 터빈 요소 부품을 제작하였고, 회전체 안정성 시험 및 성능시험을 수행하였다. 터빈 개발은 세계적으로도 활발히 이루어지지만 개발 과정과 단계에 대한 사항은 기업 비밀이란 이유로 공개 되지 않는 실정이다. 본 논문은 유기 랭킨 사이클용 터빈의 개발에 있어 어떠한 과정과 단계로 진행되는지 참고가 될 수 있을 것이다. This paper presents the process of turbine development for Organic Rankine Cycle(ORC) system. Development of turbine for ORC system is hot issue in the electric generation market due to the characteristic of organic refrigerant which the evaporate temperature is lower than general refrigerant. Recently, the industry have an interest about ORC turbine development in Korea, and they presented numerous research results. In developing the turbine, several processes can be considered. However, there was few document about ORC turbine development because of the trade secret. This paper can be used as a reference in developing ORC turbine.
저비속도 원심 회전차 외경가공에 따른 축추력 불균형을 감쇄시키기 위한 평형 피스톤 수정방안에 관한 고찰
유일수(Il Su Yoo),박무룡(Moo Ryong Park),윤의수(Eui Soo Yoon) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.9
회전차 외경 가공에 따른 축추력 평형 및 체적 효율 변화에 대하여 고찰하였다. 평형장치로 평형 피스톤이 장착된 저비속도 다단 원심 펌프를 연구 대상으로 해석을 수행하였다. 수평축 다단 펌프와 2종의 수직축 다단 펌프에 대해 해석 수행을 한 결과, 회전차 외경 가공에 의해 펌프 전방으로 추가적인 축추력이 발생하였다. 이러한 축추력 불균형은 수평축 펌프보다 수직축 펌프에서 크게 발생하였다. 축추력 불균형을 방지하기 위해 평형피스톤의 외경을 증가시키는 방안을 제시하였고, 이를 위해 필요한 평형피스톤의 직경 변화율을 산출하였다. 피스톤의 직경 변화량은 회전차 외경 가공률에 비례하여 증가 하였다. 피스톤 직경 변화량이 클수록 틈새 면적 증가로 인해 체적효율이 감소하므로, 피스톤의 길이를 함께 증가시켜 체적 효율의 감소를 방지하는 것이 효과적이다. In the present study, the imbalance in the axial-thrust and variation in the volumetric efficiency that occurred during the trimming of impeller diameter were investigated. The present study was focused on low-specific-speed multistage centrifugal pumps with a balancing piston as the balancing mechanism. The effects of impeller trimming on the axial-thrust balance in multistage pumps with horizontal and vertical axes were compared. The results showed that impeller trimming resulted in an additional axial-thrust acting in direction of pump inlet. The axial-thrust imbalance due to impeller trimming was more severe in the vertical-axis pumps than in the horizontal-axis pumps. The rate of increase in the diameter of the balancing piston, which was proportional to the rate of impeller trimming, was evaluated to maintain the axial-thrust balance. Furthermore, a simultaneous increase in the piston length and piston diameter was more effective for reducing the axial-thrust imbalance along with the volumetric efficiency drop.
염화제이철 수용액에 의한 스테인레스 강판의 식각에 관한 연구
이형민 ( Hyung Min Lee ),박무룡 ( Moo Ryong Park ),박광호 ( Gwang Ho Park ),박진호 ( Chin Ho Park ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
Wet chemical etching of stainless steel foil by aqueous ferric chloride solution was investigated in this study. Effects of various process parameters (e.g. etchant agitation rate, etchant temperature, Fe3+ ion concentration, free HCl concentration, specific gravity, etc.) on the etch rate was first studied, and it was found that the etch rate of AK (aluminum- killed) steel, chromium metal and stainless steel (STS430J1L alloy) follows the pseudo-first order reaction equation. When the fatigue ratio of etchant was kept under 16%, sludge was not formed in the solution, and the etched surface showed smooth roughness. The etch rate decreases as Baume of etchant increases, but the effect of free HCl concentration on the etch rate turned out to be minimal. Experimental data were compared with the calculated results from modeled equation, showing very good agreement.
최범석(Bum-Seog Choi),박무룡(Moo Ryong Park),황순찬(Soon Chan Hwang),박준영(Joon Young Park) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
A turbo blower directly driven by a variable-speed BLDC motor was designed and tested to investigate performance characteristics. Computational analysis and performance tests validated the design method for the present turbo blower. Experimental measurements showed that the blower has an enough stability margin. This paper gives an outline of design, computational flow analysis and performance test for aerodynamic performance of the blower.
이안성(An Sung Lee),박무룡(Moo Ryong Park),김영철(Young Cheol Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
In this study is presented a general Galerkin-FE gas lubrication analysis method. Then, the method is applied to analyze spiral groove dry gas seals particularly for low-speed mixer applications, where their maximum rotating speeds are 500 rpm. Results show that a spiral groove seal with an additional inner circular groove performs slight better than its counterpart without the inner groove for opening force but only at the expense of more leakage.
최범석(Bum-Seog Choi),박무룡(Moo-Ryong Park) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A preliminary design of an axial type turbine has been performed under the thermodynamic and fluid-dynamic conditions determined by a cycle analysis. The output power of the gas turbine is 5㎿. The configuration dimension of turbine is decided by the preliminary design method. A value of turbine efficiency and model for efficiency are applied on the preliminary design. Radial variation of the flow properties was estimated by a free vortex blading method, and was corrected from a three dimensional flow calculation. The loading coefficient, flow coefficient and shape parameter of the turbine designed in the present study are compared with various turbines given in the literature. The values of the loading coefficient, flow coefficient and shape parameter of this turbine was close to those of highly efficient axial turbine in the literature.