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M. Sq. Rahman(라흐만),G. H. Lee(이경환),K. S. Lee(이광성),H. S. Chung(정한식),H. M. Jeong(정효민) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10
Put Renewability and pollutant free energy source makes hydrogen energy popular rapidly. Hydrogen gas pressure which is after passing through reciprocating compressor part has high pulsation wave form. A unit, snubber is used as compressor components to reduce the harmful pulsation waveform and to remove the impurities in the hydrogen gas. An experiment has been conducted to investigate the pulsation reduction performance of different arrangement of snubber i.e. snubber array, single snubber in reciprocating compression system. The single snubber is able to reduce amplitude 55.947% ~ 58.248% (0.444, 0.786, 1.073 and 1.18 ㎪) with 0.475% ~ 1.966% pressure loss. It is found that the pressure fluctuations are reduced from 90.1977% ~ 92.6336% with pressure loss 1.5013% ~ 4.9034% for compressor operation at different speed which ensure the good performance of snubber-array as pulsation damper over single snubber in hydrogen compressing system.
왕복동식 수소압축기의 흡입밸브 통로유동에 관한 수치해석
이경환(Gyeong-Hwan Lee),M-Sq-Rahman,심규진(Kyu-Jin Shim),정효민(Hyo-Min Jeong),정한식(Han-Shik Chung) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
A complex passage analysis on suction valve has been performed with a high pressure reciprocating hydrogen compressor. General information about an internal gas flow is presented by numerical simulation approach. Flow characteristic analysis, including pressure and turbulence kinetic energy distribution of hydrogen gas coming to the cylinder of a reciprocating compressor are presented in this paper. Suction passage model is designed based on real model of hydrogen compressor. Pressure boundary conditions are applied considering the real condition of operating system. The result shows static pressure and turbulent kinetic energy are not distributed uniformly along the passage of the Hydrogen system. Path line or particles tracks help to demonstrate flow characteristics inside the passage. Based on this result, the design improvement, such as reducing the varying flow parameters and flow reorientation should be done. Consequently, it will be achieved much better hydrogen compressing system.
Study of Steam Ejector in Experimental and Numerical
S. Wibowo(위보워),M. Sq. Rahman(라흐만),G. H. Lee(이경환),H. M. Jeong(정효민),H. S. Chung(정한식) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
Steam jet ejectors are essential part in many industrial applications such as refrigeration and air conditioning, desalination, chemical industries, and so on. In this study, experiment and numerical of jet ejector model were investigated to reveal the complication of the flow and the mixing process in a steam ejector. Air was used as primary and secondary fluids in experiment. In the experiment, the influence of nozzle exit positions was investigated. The result shows the static pressure distribution along the ejector wall is influenced by nozzle exit position. We also carried out CFD simulation in this study. Realizable k-epsilon turbulence model was tested in CFD. The CFD results were validated with available experimental data.
Numerical and Experimental Study on the Steam Ejector
S. Wibowo(위보워),M. Sq. Rahman(라흐만),J. S. Woo(우주식),H. M. Jeong(정효민),H. S. Chung(정한식) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
Ejectors are simple pieces of equipment. They are employed in the industry such as in refrigeration and air conditioning, desalination, petrochemical and chemical industry. The purpose of this paper is to reveal the complication of the flow and the mixing process in a steam ejector. Air was used as primary and secondary fluids here. In this experiment, the influence of nozzle exit positions was investigated. The result shows the static pressure distribution along the ejector wall is influenced by nozzle exit position. In this study CFD simulation were also undertaken. Standard k-epsilon, RNG k-epsilon, and Realizable k-epsilon were tested in CFD. The CFD results were validated with available experimental data. In this case the result shows that realizable k-epsilon model closer with experimental result than another models.
이경환 (G. H. Lee ),라흐만 (M. Sq. Rahman ),김철표 (C. P. Kim ),정태휘 (T. W. Joung ),정효민(H. M. Jeong),정한식 (H. S. Chung ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
Numerical analysis information of a complex discharge-passage will be very useful to improve hydrogen compression system. General information about an internal gas flow is presented by numerical analysis approach. Relating with hydrogen compressing system, which have an important role in hydrogen energy utilization, this should be a useful tool to observe the flow quickly and clearly. Flow characteristic analysis, including pressure and turbulence kinetic energy distribution of hydrogen gas from cylinder going to the chamber of a reciprocating compressor are presented in this paper. Discharge-passage model is designed based on real model of hydrogen compressor. Pressure boundary conditions are applied considering the real condition of operating system. The result shows pressure and turbulence kinetic energy are not distributed uniformly along the passage of the hydrogen compressing system. Path line or particles tracks help to demonstrate flow characteristics inside the passage. The existence of vortices and flow direction can be precisely predicted. Based on this result, the design improvement should be done. Consequently, development of the better hydrogen compressing system will be achieved.
왕복동식 수소압축기의 흡입밸브 통로유동에 관한 수치해석
이경환(Gyeong-Hwan Lee),라흐만(M-Sq-Rahman),심규진(Kyu-Jin Shim),정효민(Hyo-Min Jeong),정한식(Han-Shik Chung) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
A complex passage analysis on suction valve has been performed with a high pressure reciprocating hydrogen compressor. General information about an internal gas flow is presented by numerical simulation approach. Flow characteristic analysis, including pressure and turbulence kinetic energy distribution of hydrogen gas coming to the cylinder of a reciprocating compressor are presented in this paper Suction passage model is designed based on real model of hydrogen compressor. Pressure boundary conditions are applied considering the real condition of operating system. The result shows static pressure and turbulent kinetic energy are not distributed uniformly along the passage of the Hydrogen system. Path line or particles tracks help to demonstrate flow characteristics inside the passage. Based on this result, the design improvement, such as reducing the varying flow parameters and flow reorientation should be done. Consequently, it will be achieved much better hydrogen compressing system.