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유동해석을 통한 선박용 디젤엔진(LDCL JWCS)의 3-Way Valve 형상 설계
황기웅(Gi Ung Hwang),곽효서(Hyo Seo Kwak),김재열(Jae Yeol Kim),엄태진(Tae Jin Eom),김철(Chul Kim) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.11
기존의 선박용 디젤 엔진에는 항상 일정한 엔진 부하량을 유지하는 캠 구동장치가 적용되고 있었으나, 최근 환경규제로 인하여 엔진 부하량에 따라 실린더 온도를 개별적으로 제어하는 LDCL(Load dependent cylinder liner) JWCS(Jacket water cooling system)가 적용된 전자유압 제어방식이 개발되었다. 이 시스템에서 3-way 밸브는 실린더의 상부와 하부와의 온도 차이를 줄여 저온부식을 방지하는데, 대부분 수입에 의존하고 있으며 토출유량이 낮다. 이에 본 연구에서는 3-way 밸브 내부 형상 관련 설계인자가 성능(토출 유량 및 온도)에 미치는 영향을 파악하여 밸브의 형상 설계를 수행하였으며, 기존 모델과의 성능 비교를 통해 제안된 밸브의 우수성을 검증하였다. Camshaft engines designed for constant engine loads have been applied to existing marine diesel engines. However, due to environmental regulations, electro-hydraulic servo mechanisms, which have a loaddependent cylinder liner jacket water cooling system (LDCL-JWCS), have been recently developed to individually control the temperature of the cylinders depending on the engine load. In this system, the 3-way valve, which prevents low temperature corrosion by reducing the temperature difference between the upper and lower parts of the cylinder, has been employed, but the outlet mass flow of the existing valve is low. In this study, the design of the internal shape of the 3-way valve was performed by analyzing the effects of the design parameters of the valve shape on the performance (i.e., the outlet mass flow rate and temperature). The proposed model was verified by comparing its performance to that of existing marine diesel engine valves.
이명곤(Myeong Gon Lee),김양균(Yang Gyun Kim),임채석(Cha Suk Lim),한승호(Seung Ho Han) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The high-pressure valve uses one set of 2-way valves for the purpose of reversing fluid direction. If there is no accurate control device for the 2-way valves, lots of surging can be generated. The surging is a kind of pressure ripple that occurs in rapid changes of fluid motions under inaccurate valve control. To reduce the surging effect, a 3-way reversing valve can be applied which provides a rapid and precise change of water flow directions without any accurate valve control system. However, a cavitation occurs due to a complicated internal trim shape of the 3-way reversing valve. The cavitation causes not only noise and vibration but also decreasing the efficiency of valve-operation, in which the bubbles generated below the saturated vapor pressure are collapsed rapidly at higher pressure zone. The shape optimization of the 3-way reversing valve to minimize the cavitation effect is necessary. In this study, the cavitation index according to the international standard ISA was introduced to estimate macroscopically the occurrence of the cavitation effect. Computational fluid dynamic analysis was carried out, and the cavitation effect was quantified by means of the percent of cavitation converted from calculated results of vapor volume fraction. In addition, the shape design of the 3-way reversing valve was performed by taking into account of the percent of cavitation.
박시범(Si-Beom Park),김진미(Jin-Mi Kim),이철재(Chul-Jae Lee),강정호(Jung-Ho Kang) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
The 3/2-way valve supplies the high pressure air to ship engine for starting engine. In this paper, the high pressure 3/2-way valve for ship engine has the goal as reverse engineering by searching the fluid characteristic at this valve. The reverse engineering of 3/2-way valve is measured directly by Verier-calipers and is compared with 3D scanner. The fluid characteristic in this valve is used for a simulation method by ANSYS CFX 12.1. On the contrary, discs and the shaft are as the important components on numerical simulation by controlling the air flow at this valve. The fluid characteristics are seen to make high velocity and complicated vortex around the shaft. And the flow coefficient is calculated in order to apply for industrial field.
한상욱(Sang Uk Han),이명곤(Myung Gon Lee),김양균(Yang Gyun Kim),임채석(Cha Suk Lim),한승호(Seung Ho Han) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The valve for high-pressure cleaner used to clean engine blocks after machining process consists of one set of 2-way vales, which play a role of change of water flow direction. In the 2-way valve, there are lots of surging effects occurred in operation at high pressure condition, so that the 3-way reversing valve can be used to reduce the surging. Since the 3-way reversing valve provides a rapid change of water flow direction, the surging is reduced significantly. However, a complicated internal trim shape of the 3-way reversing valve causes frequent cavitations which occur at sudden pressure drop and velocity change. In this study, the design of internal trim shape of the 3-way reversing valve was carried out via shape optimization considering minimization of the cavitation. (RIC 2012-0592)
바이패스용 3-Way 밸브를 장착한 온수 난방시스템의 압력 및 유량 특성 평가
허전(Jurn Hur),이석종(Suk-Jong Lee),성재용(Jae-Yong Sung),이명호(Myeong Ho Lee),윤재동(Jai Dong Yoon) 대한설비공학회 2007 설비공학 논문집 Vol.19 No.3
A 3-way valve has been applied to a distributor in a hot-water heating system and the performance of the system was evaluated in view of the variations of pressure drop and flow rate. The 3-way valve has been designed to bypass overplus hot-water when a control valve is closed. Note that the flow goes through heating pipeline in normal operation. In the present study, the measured pressure drops in each part of the flow paths show that the contribution to the total pressure drop is in the order of the supply header with control valves, piping system of each room and return header of the distributor, even though the amount of it is different according to the flow paths. As a result of performance test by sequential closing of the control valves, the variations of pressure drop and flow rate in the distributor with 3-way valves is much lower than those with previous 2-way valves, which prevent noises induced by pressure fluctuations.
3-way 초고압 밸브의 유로제어를 위한 니플 파단 특성에 관한 연구
강대희,란지,정윤재,김원태 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.6
The 3-way valve have been used as a valve for opening and closing the valve by the flow control in the pressure system of the cryogenic and high pressure environment. In this paper, numerical analysis and experimental study on fracture nipple of 3-way ultra high pressure valve applied to space launch vehicle was carried out. We have developed a 3-way valve numerical simulation modeler of cryogenic environment usingcommercial software ANSYS 18.2. As results of numerical analysis, optimum nipple condition was derived. In addition, a 3-way valve prototype was fabricated and the fracture test was performed and compared with the numerical analysis results.
이준호(Joon-Ho Lee) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.4
3-way ball valves have been mostly used for high temperature/high pressure valves using in petrochemical carriers and oil tankers, which requires high quality products with confidentiality and durability. As a larger disaster may be generated by leakage of oil or gas from valves, thus the present research applied a numerical analysis method with thermal-structural coupled field analysis and the performance test. The Max stress by parts was confirmed through thermal-structural coupled field analysis and develop the 3-way ball valve design, which is safe on operating condition. And its performance was verified by carrying out pressure test, leakage test and durability test for the manufactured 3-way ball valves with satisfying it’s regulations.
3Way Coolant Valve 전압별 일정 토크 제어를 위한 DC Motor 연구
김동석(Dong-Seok Kim),김정태(Jung-Tae Kim),노의동(Eui-Dong Ro),이창훈(Chang-Hoon Lee) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
전기 자동차 관련 부품의 연구개발 및 실용화가 활발히 진행되고 있다. 내연기관의 공조시스템은 차량의 엔진 열에 의한 에너지를 이용하여 실내 난방에 활용하지만 전기 자동차의 공조시스템은 차량 배터리를 사용하여 한다. 즉 전기차 배터리를 이용함으로써, 차량의 연비와 직결되는 문제에 직면하게 된다. 위와 같은 문제를 해결하기 위해 차세대 공조시스템의 개발이 진행되고 있으며, 이 시스템의 냉각수 흐름을 제어하는 3Way Coolant Valve에 대한 기술 개발이 진행 중이다. 현재 3Way Coolant Valve는 Solenoid Type으로 활용되고 있으나, 제품의 에너지 소비 감소 및 원가 절감을 최적화하기 위해 DC Motor Type으로 개발 진행 중이다. 현재 Solenoid Type의 경우 냉각수 유로 전환 시 일정한 전류 출력을 통해 밸브의 동작을 유지시켜주는 문제점이 있다. 하지만 DC Motor Type의 경우 액추에이터 내부 기어 구조 및 전압(V)별 전류(I) 출력제어 방법을 통해 토크(Torque)를 일정하게 제어함으로써, 전기 소모 에너지(W)를 줄이는 효과로 차량 배터리 소모를 줄일 수 있는 효과를 볼 수 있다. W = VI 본 논문에서는 DC Motor Type과 Solenoid Type의 Motor의 전기적 성능을 비교를 통해 전기 에너지 효율 최적화 연구를 진행하고자 한다.