http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Proposal and Analysis of Hydrogen Mitigation System Guiding Hydrogen in Containment Building
Park, Kweonha,Lee, Khor Chong The Korean Society of Marine Engineering 2015 한국마린엔지니어링학회지 Vol.39 No.5
This study is about a hydrogen mitigation system in a containment building like an offshore or a nuclear plant. A hydrogen explosion is possibly happened after condensation of steam if hydrogen releases with steam in a containment buildings. Passive autocatalytic recombiner is the one of the measures, but the performance of this equipment is not sure because the distribution of hydrogen is very irregular and is not predicted correctly. This study proposes a new approach for improving the hydrogen removing performance with hydrogen-guiding property. The steam is simulated and analysed. The results show that the shallow air containment reduced over 55% of the released hydrogen and the deep air containment type reduces over 80% of released hydrogen.
The Effect of Water Emulsified Fuel on a Motorway-Bus Diesel Engine
Park, Kweonha,Kwak, Inseok,Oh, Seungmook The Korean Society of Mechanical Engineers 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.11
In this study, the combustion characteristics and durability of a diesel engine using emulsified fuel was investigated. Water was used in oil type emulsified fuel. In order to understand the effect of emulsified fuel in a wide range of engine running conditions, D-13 mode was selected as a test condition, and a durability test was included to understand the long-term effect of water. Combustion pressure in a cylinder, exhaust emissions, specific fuel consumption, sound level and maximum torque were measured. NOx and PM were simultaneously reduced and the specific fuel consumption was increased and decreased at low and high loads, respectively. There was no trouble and any damage on the parts of the cylinder during a 500 hour durability test.
Combustion Characteristics and Durability on a Diesel Engine Using Emulsified Fuel
Kweonha Park,Inseok Kwak,Seungmook Oh 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
This study is carried out to investigate the combustion characteristics and durability on a diesel engine using emulsified fuel. The test uses water in oil type emulsified fuel with 13% - 15% water. Combustion pressure in cylinder. exhaust emissions, specific fuel consumption. sound level and maximum torque are measured.<br/> In order to understand the effect of emulsified fuel in wide range of engine running condition. D-13 mode is selected as a test condition. and a durability test to understand the long term effect of water. The results show the 15% water emulsified fuel is good for NOx and PM reduction simultaneously, is not much effect on a fuel consumption and a durability.<br/>
The Effect of Water Emulsified Fuel on a Motorway-Bus Diesel Engine
Kweonha Park,Inseok Kwak,Seungmook Oh 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.11
In this study, the combustion characteristics and durability of a diesel engine using emulsified fuel was investigated. Water was used in oil type emulsified fuel. In order to understand the effect of emulsified fuel in a wide range of engine running conditions, 0-13 mode was selected as a test condition, and a durability test was included to understand the long-term effect of water. Combustion pressure in a cylinder, exhaust emissions, specific fuel consumption, sound level and maximum torque were measured. NOx and PM were simultaneously reduced and the specific fuel consumption was increased and decreased at low and high loads, respectively. There was no trouble and any damage on the parts of the cylinder during a 500 hour durability test.<br/>
Diesel Spray-Wall Interation Model and Spray Characteristics of a High Pressure Injection System
Park, Kweonha,Choi, J. S.,Jeon, H. J. 경상대학교 공과대학 항공기계공학부 1999 WORKSHOP 자료집 Vol.1999 No.1
This paper describes a new mathematical model for the calculation of a diesel spray impacting onto a wall, and its implementation in to a computational fluid dynamics computer code for the calculation of engine flows, then the model applies to get numerical results for the high pressure effects on spray characteristics in wide space or limited space with near walls. The discrete droplet model is used for the spray calculation. The gas phase is modelled m terms of the Eulerian equations. These equations are transformed into general non-orthogonal coordinates and solved in a finite volume manner. Lagrangian equations are used for the liquid phase. The sets of algebraic equations are solved by a non-iterative implicit solution scheme.
박권하(Kweonha Park),이진아(Jin-A Lee),김영남(Young Nam Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The thermal devices has became smaller and the performance has increased in the related industry, which induces a high heat density damaging the devices. Many technologies have been developed in order to remove the heat. The oscillating heat pipe(OHP) is the one of the cooling devices. The OHP is operated by the mechanism of vaporization and condensation. In this study the effect of fill ratio in the 3 dimensional arranged oscillating heat pipe is tested at the power of 50W and 260W. The result shows that the fill ratio of 19% is the best for the low and high power supplies.
에탄올 혼합율이 가솔린 엔진의 배기와 성능에 미치는 영향
박홍일(Hongil Park),오승우(Seungwoo Oh),박권하(Kweonha park) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Rapid growth of automobile industry has become a major reason for energy consumption and environmental pollution around a large city seriously.<br/> Saving energy greatly effects on the countries that do not have energy sources, so saving energy and varying energy source are demanded.<br/> In this study, the effect of ethanol mixing rate on exhaust emissions, fuel consumption rate and engine torque is tested in a gasoline engine without any retrofit Mixing rate is varied from 0% to 85% and engine speed and torque are also varied. The result show ethanol mixing rate of 10 to 15% is considered as a suitable range in order to use the fuel without any retrofit Maximum torque is decreased with mixing rate increase, but the torque shows similar value is the range of 10 to 15% The values of CO, HC emission and fuel consumption are similar or slightly increased except the range of 10 to 15%.
[가솔린엔진부문] 라디칼 인젝터를 장착한 예혼합 압축착화엔진의 주실당량비 변화에 따른 연소특성
조상무(Sangmoo Jo),박권하(Kweonha Park) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
A premixed-compression-ignition engine has been studied to improve the performances on efficiency and exhaust emissions. However those systems have been in some difficulties for controlling combustion. This study introduces the system having a radical injector placed on the center of the cylinder head and investigates the combustion behavior in a main chamber with equivalence ratio variation.<br/>