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정영대(Youngdae Choung),허형석(Hyungseok Heo),이동혁(Donghyuk Lee),배석정(Sukjung Bae),강현석(Hyunseok Kang) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Development of compressed natural gas(CNG) vehicle is prevailing, because of its stability of energy supply and cleanness of exhaust emissions. A CNG regulator is a key component that maintains stability of fuel supply and appropriate pressure of a CNG vehicle. The regulator lowers and controls the pressure of CNG form a high pressure tank to a level adequate for the engine use. When the gas is decompressed in the regulator, icing caused by Joule-Thomson effect is an immediate cause of fuel leakage and damages. The main objective of this paper is to investigate the performance characteristics of a CNG regulator to locate icing areas for optimum design using CFD. The numerical analysis results demonstrate that mass flow rate is 0.042 ㎏/s and CNG outlet temperature is 20.7 ℃ at the design point.
정영대(Youngdae Choung),허형석(Hyungseok Heo),이동혁(Donghyuk Lee),배석정(Sukjung Bae),김태진(Taejin Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
To deal with progressive reinforced environmental regulations such as EURO-6, EGR cooler and auto transmission A/T oil cooler require increased heat dissipation for vehicles of more than 2,000 ㏄ displacement. And a decrease of front-end area caused by massed heat exchangers in a car, makes the deteriorated radiating condition. The untied EGR cooler can improve radiating condition by integration of water cooled A/T oil cooler from the radiator and EGR cooler on the engine. This integrated heat exchanger can improve the handling of the transmission and the energy efficiency of the vehicle with a fast warmup of the A/T oil at a cold start. The main objective of this paper is to investigate the performance characteristics of an EGR cooler united with an A/T oil cooler using CFD on each component. The numerical analysis results demonstrate that the total heat dissipation ratio is 11.13 ㎾, the pressure drops of exhaust gas, A/T oil and coolant were 2.41 ㎪, 0.668 ㎪ and 7.28 ㎪, respectively.
엔진 Fast Warm-up을 위한 배기열 회수 장치의 실험적 연구
정영대(Youngdae Choung),허형석(Hyungseok Heo),오광철(Kwangchul Oh),이동혁(Donghyuk Lee),이헌균(Heonkyun Lee),배석정(Sukjung Bae),서호철(Hocheol Suh),박경석(Kyoungsuk Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The main objective of this paper is to investigate the performance characteristics of the exhaust heat recovery system for engine fast warm-up. The exhaust heat recovery system is one of the most effective technology to enhance the fuel consumption efficiency.
하이브리드 버스용 Vane Type Steering Oil Pump 성능 해석 평가
정영대(Youngdae Choung),배석정(Sukjung Bae),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이동락(Dongrak Lee),김대상(Daesang Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
HEV bus has own characteristic to stop the engine to prevent loss of available energy when stopped at red lights. Because of this, electric steering oil pump system is required to keep the performance designed and protect the steering system in the event of abrupt drive of engine. The electric motor enables the oil pump to provide constant oil flow to power steering system. The main objective of this paper is to investigate the performance characteristics of vane type steering oil pump for HEV bus according to variable geometries and operating conditions of the vane type pump by use of CFD. The numerical analysis demonstrates that the discharge flow rate and the torque increased 15.1% and 17.2 %, while the theoretical oil flow rate is raised from 12㏄/rev to 14㏄/rev(16.7% increase) at design point.
가변 제어를 위한 병렬 배치식 엔진 오일펌프의 유동 특성 해석 평가
황재순(Jaesoon Hwang),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),배석정(Sukjung Bae),정영대(Youngdae Choung),이병석(Byeongseok Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Conventional mechanical engine oil pump is driven by engine power via belt mechanism, whose discharge oil flow increases linearly with rotating speed. This causes engine power loss because the mechanical oil pump supplies more excessive oil flow than required on the various engine speeds and temperature conditions. Automotive manufacturing companies are developing electric oil pumps to control the oil flow rate variably in the engine operation regions. However, on the low temperature conditions engine oil gets more viscous and requires more driving torque, moreover, the motor to drive the electric oil pump is required to have larger capacity and size. The solution to make up these defect is technique of parallel engine oil pumps consists of an electric pump and a reduced mechanical pump. This study aimed to introduce the technology of parallel engine oil pumps and to analysis hydraulic performance of parallel engine oil pumps on the various operating conditions by computational fluid dynamics.
가솔린 엔진용 배기 폐열 회수 시스템의 작동 유체 선정
배석정(Sukjung Bae),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),정영대(Youngdae Choung),황재순(Jaesoon Hwang),이춘범(Chunbeom Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Waste heat recovery from exhaust gas of vehicle engine is one of the most effective technology to enhance the fuel energy efficiency. There are a variety of working fluids in the stationary waste heat recovery system of industrial field. However, the investigations for the waste heat recovery of vehicle engine are now forthcoming, in which the engine load of a vehicle varies with time and environmental conditions. This study focuses to select the working fluid for an exhaust waste heat recovery system of a gasoline engine regarding to maximization of cycle efficiency on exhaust conditions. To calculate the cycle performance and thermodynamic properties more efficiently, we produced a cycle analysis program via Refprop 8.
PHEV 엔진 급속 웜업을 위한 배기열 회수 장치 성능평가에 대한 연구
강태구(Taegu Kang),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이동혁(Donghyuk Lee),정영대(Youngdae Choung),김태진(Taejin Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently, the regulations on fuel economy, increasing gas mileage and decreasing CO₂ emission, have been tightened extremely. Many studies are performed to realize high-efficiency and high-fuel economy for engine by recovering waste energy. Due to improvement in fuel economy at low temperature, The exhaust heat recovery system(EHRS) has received attention. The exhaust heat recovery system(EHRS) is one of the waste heat recovery system. It reduces engine warming up time by elevating coolant temperature quickly by heat transfer between the coolant and exhaust gas. Therefore, it is possible that fuel economy is enhanced by the reduced the engine friction loss. This paper presents the performance evaluation of EHRS applied on a PHEV engine with respect to various operating conditions.
엔진 배기 폐열 회수 시스템 사이클 해석 프로그램 개발
배석정(Sukjung Bae),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이동혁(Donghyuk Lee),정영대(Youngdae Choung),황재순(Jaesoon Hwang) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The environment surrounding us reinforces gradually to meet exhaust regulations side and fuel efficiency side. The application of waste heat recovery system to recover waste heat from vehicle engine exhaust has been a part of enormous technical efforts to cope with the situation that have been carried out. A cycle analysis program has been produced for calculation of total performance of a wast heat recovery system for a vehicle engine in the previous study. Water has been selected for the working fluid suitable to the purpose of wast heat recovery from engine exhaust gas. This study discusses the development of a cycle analysis program linked with design programs of kernel components of Rankine cycle, i.e., a boiler and a condenser. This program is expected to predict the system cycle performance and characteristics of the components at design stage or in case of design modification.
엔진 급속 웜업을 위한 배기열 재순환 장치의 열유동 특성 평가
이헌균(Heonkyun Lee),허형석(Hyungseok Heo),이동혁(Donghyuk Lee),배석정(Sukjung Bae),황재순(Jaesoon Hwang),정영대(Youngdae Choung),이상헌(Sanghun Lee),김태진(Taejin Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, A number of researchers have focus their attention on reusing thermal energy of waste heat in exhaust gas. The exhaust heat recirculation system is one of the waste heat recovery system. It reduces engine warming up time by elevating coolant temperature quickly by heat transfer between coolant and exhaust gas. Therefore, it is possible that vehicle economy is enhanced by the reduced engine fiction loss. This paper presents the performance estimation of exhaust heat recirculation device by computational fluid dynamic method. Moreover, heat transfer characteristics are analytically investigated via operating conditions.
LP EGR Cooler의 튜브 형상에 따른 열유동 성능 평가
황재순(Jaesoon Hwang),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이동혁(Donghyeok Lee),배석정(Sukjung Bae),정영대(Youngdae Choung),장용수(Yongsoo Jang) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, high efficiency, high performance and compactness are required for the EGR cooler to meet the Euro-5 emission regulation. This study aimed to CFD analysis for design of LP EGR cooler which is key components of dual loop EGR system. For the design of EGR cooler, the heat transfer performance characteristics of single tube according to various design parameters are analyzed and compared. LP EGR cooler which is piled up tubes is simulated in the same volume basis.