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함영복(Y. B. Ham),공태우(T. W. Kong),차재곤(J. G. Cha),권순광(S. K. Kwon),안국영(K. Y. Ahn) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The metal diaphragm type hydrogen compressor system is operated by oil hydraulic power, In this system an oil compensating pump have been demanded to compensate for leakage oil head chamber. The oil leakage is occurred two parts, the one is a clearance leakage between plunger piston and main cylinder, the other is an overflow through the relief valve. So, metal diaphragm type hydrogen compressor have to consist of an oil compensating pump, commonly used hydraulic piston pump driven by main crank shaft. The radial piston type oil compensating pump is developed and experimented with new rolling contacted piston mechanism. The search results compared with commonly used line contacted piston and the new rolling contacted piston using ball. The developed the one piston element of the radial piston pump consists of piston having steel ball, return spring two check valves and eccentric cam having ball racer. The volumetric displacement of designed one piston element is 0.437cc/rev. Operating characteristics are tested such as no load to 60bar loaded with every 20bar increasing step, where pressure ripple and flow rate are experimentally investigated.
함영복(Y. B. Ham),권순광(S. K. Kwon),공태우(T,W. Kong),윤소남(S. N. Yun),안국영 (K. Y. Ahn) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The hydrogen compressor system with metal diaphragm is operated by oil hydraulic power. It consists of gas head, metal diaphragm, oil head, oil compensating pump, relief valve and plunger etc. An oil compensating pump have been demanded to compensate for an oil leakage in an oil head chamber and a piston head chamber. The oil leakage is occurred through clearance between a plunger and a main cylinder Some quantity of oil overflow through a relief valve. So, the hydrogen compressor system has to have the oil compensating pump, commonly used radial piston type hydraulic pump and coupled operating with main crank shaft. Main components are operated by oil hydraulic components in this system. Therefore, a dynamic simulation model of the hydraulic system using commercial software AMESim tool is developed in this study, included a radial piston type oil compensating pump model, a high speed and a high pressure relief valve model, a plunger driven by crank shaft and system head part included the metal diaphragm etc. A dynamic simulation results presented the operating characteristics of main hydraulic components in this simulation.
함영복(Y. B. Ham),차재곤(J. G. Cha),김대명(D. M. Kim),공태우(T. W. Kong),윤소남(S. N. Yun),안국영(K. Y. Ahn),권병수(B. S. Kweon) 유공압건설기계학회 2010 드라이브·컨트롤 Vol.7 No.1
This paper presents the experimental results of the radial piston type oil pump with new mechanism for a metal diaphragm hydrogen compressor. Generally, metal diaphragm type hydrogen compressor systems are operated by oil hydraulic power. In this system an oil compensating pump has been demanded to compensate for a leakage oil head chamber. The metal diaphragm type hydrogen compressor consists of an oil compensating pump, commonly used hydraulic piston pump and driven by main crank shaft. The radial piston type oil compensating pump with new rolling contacted piston mechanism is developed and experimented. The developed piston element of the radial piston pump consists of piston, steel ball, return spring, two check valves, eccentric cam and ball racer. In this study, designed 4 type pistons as and orifice hole. Operating characteristics and pressure ripple characteristics are tested under no load to 60bar loaded with every 20bar increasing step and pressure ripple and flow rate are experimentally investigated.
연료전지 Stack Cooling을 위한 압전 공진펌프 설계에 관한 연구
함영복(Y. B. Ham),송종진(J. J. Song),박중호(J. H. Park),안국영(K. Y. Ahn) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In the stack cooling of household fuel cell system(1kW), cooling water pump has been demanded for compact size, low power consumption and constant delivery-performance of the cooling water. To obtain sufficient performance for practical application in above-mentioned area, in this paper, we studied on piston pump using multi-layer PZT actuator(5mm×5mm×18mm). The piston pump used a multi-layer PZT(16㎛ displacement at 100 Vpp) as a reciprocating motion actuator and structure producing resonance to amplify the displacement of a moving piston. The pump composed of two springs and the piston that could be supported a multi-layer PZT. We also decided the mass of moving parts, the stiffness coefficient of two springs with simulation. In this simulation, we predicted the resonant displacement and frequency of the pump. Then, based on the obtained results, without a mechanical amplification, we could make a large displacement.
함영복(Y. B. Ham),조원용(W. Y. Cho),서우석(W. S. Seo),윤소남(S. N. Yun),박중호(J. H. Park),안국영(K. Y. Ahn) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper describes a piezoelectric pump using the silicon diaphragm with aluminum plate and spring. The piezoelectric pump uses a hinge-lever mechanism to amplify the displacement of multilayered PZT actuator. No-load flow rate and load characteristic of fabricated piezoelectric pump were tested. The fabricated piezoelectric pump of 80 ㎜ diameter and 65 ㎜ length achieves maximum flow rate and output pressure of 790 ㎖/min and 9.7 kPa, respectively, at an applied voltage of 100 V and operating frequency of 6 ㎐. Future works will focus on the application of the liquid cooling system for heat rejection of high power electronic devices existing in computers and fuel cell etc.
소형 가압형 연료전지/가스터빈 하이브리드 시스템의 성능 비교 해석
박성구(S. K. Park),유병준(B. J. You),김동섭(T. S. Kim),손정락(J. L. Sohn),이영덕(Y. D. Lee),안국영(K. Y. Ahn) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Design performances of the fuel cell / gas turbine hybrid power generation systems based on two different fuel cells (PEMFC, SOFC) have been comparatively analyzed. In each system, the fuel cell operates at an elevated pressure corresponding to the compressed air pressure of the gas turbine. Typical design parameter of PEMFC and SOFC of 10kW class are assumed. By varying the turbine inlet temperature of the gas turbine, efficiency upgrade due to the hybridization is estimated for the two systems. The SOFC is predicted to exhibit not only a better fuel cell efficiency but also a greater efficiency upgrade through the hybridization. For both systems, increasing the turbine inlet temperature increases the power portion of the gas turbine, but decreases the system efficiency.
임암호(A. H. Lim),안국영(K. Y. Ahn),김한석(H. S. Kim),김용모(Y. M. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The concept of lean-premixed combustion in gas turbine combustor operation has become a standard<br/> in recent years as an effective means to meet stringent enviromental standards on NOx emissions. The<br/> combustion characteristics of 75 kW class lean premixed combustor were investigated at the conditions<br/> of high temperature and ambient pressure. The exit temperature and emissions of CO and NOx were<br/> measured at the center of exit plane. The high temperature air of 550K~650K was supplied through air<br/> preheater. As expected, experimental results indicate that NOx emission was increased and CO emission<br/> was decreased by increasing inlet air temperature. But CO emission measured at the center of exit<br/> plane was increased because of the non-uniform radial direction profiles. The Semi-Empirical<br/> Correlation method was applied to obtain the design point emissions of NOx and CO. Also the flame<br/> temperature, CO and NOx emissions were measured along the centerline of liner at 650K inlet air<br/> temperature to determine the position of dilution holes.