http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
연료온도 및 분사홀 크기에 의한 GDI 인젝터 유량 특성 연구
송재천 ( Song Jae-cheon ),정재호 ( Jung Jae-ho ),박정환 ( Park Jeong-hwan ) 한국액체미립화학회 2018 한국액체미립화학회 학술강연회 논문집 Vol.2018 No.-
This study presents an experimental investigation of the flow characteristics according to fuel temperature and spray hole size for high pressure GDI injector, equipped with multi-hole type nozzle. For this purpose, injection rate measurements were performed with four different spray hole size over operating conditions from 100 to 300bar of fuel pressure and from -30 to +80℃ of fuel temperature. The test was conducted on FIE system bench similar to the actual engine operating conditions using the solenoid type injector.(Fig.1) Fuel injection rate was analyzed by using IAV injection rate system based on the Bosch method.
덕트 형상 연소기의 연소불안정에 대한 Semi-Active Control
송재천(Jae-Cheon Song),송진관(Jin-Kwan Song),황정재(Jeong-Jae Hwang),윤영빈(Young-Bin Yoon),이종근(Jong-Guen Lee) 한국항공우주학회 2009 韓國航空宇宙學會誌 Vol.37 No.11
연소불안정현상은 주로 음향파와 열방출률 섭동간의 상호작용에 의해 발생한다고 알려져 있다. 이러한 현상은 헬름홀츠 공진기와 같은 수동제어기를 사용하여 감소시킬 수 있다. 그러나 헬름홀츠 공진기는 일반적으로 좁은 주파수대역에 대해서만 효과가 있는 단점을 가진다. 따라서 본 연구에서는 다양한 작동 범위에서 효과를 가질 수 있도록 피스톤을 사용하여 헬름홀츠 공진기의 부피를 변화시켜가며 연소불안정현상에 적용하였다. 그 결과 피스톤을 최적 위치인 40mm에 동조시킴으로써 연소 불안정 모드의 진폭을 크게 감소시킬 수 있었다. 그리고, 연소기와 헬름홀츠 공진기 사이의 동압의 위상차가 흥미로운 관계에 있음을 나타내었다. 또한 헬름홀츠 공진식과 위상차를 이용한 능동적으로 동조되는 수동제어방식에 대해 알아보았다. Combustion Instabilities are caused by a coupling between acoustic waves and unsteady heat release. They can be eliminated using passive controller such as a Helmholtz resonator. But, Helmholtz resonator is normally only effective over a narrow frequency range. In this work, Helmholtz resonator is applied for reducing the combustion oscillations and we vary the Helmholtz resonator volume using piston in oder to tune in the wide range of operating conditions. As the result, it is found that the dominant combustion oscillations can be largely reduced by optimizing the size of resonator volume. And, interesting relation for phase difference of dynamic pressure both combustor and the helmholtz resonator are presented in this paper. Also, we investigate semi-active control using Helmholtz equation and phase difference.
송인규,이종국,송재천,이화영 ( In Kyu Song,Jong Koog Lee,Jae Cheon Song,Wha Young Lee ) 한국공업화학회 1994 공업화학 Vol.5 No.3
에탄올 전화반응 및 MTBE (methyl t-butyl ether)분해반응을 통하여 헤테로폴리산 촉매가 지니는 표면 및 내부 산점의 역할과 형성에 대하여 살펴 보았다. 12-텅스토인산에서 에탄올 탈수반응을 수행할 경우 디에틸에테르는 표면 산점에서 생성되며 에틸렌은 촉매 내부산점에서 생성된다. 물은 산점을 강화하는 역할을 하지만 유기염기의 경우 내부 산점을 약화시킨다. 금속염의 산점 형성은 결정수의 가수분해 혹은 금속의 부분적 치환에 따른 양성자에 기인하며 The role and the formation of surface and bulk acid sites of heteropoly acids were studied by examining ethanol conversion and MTBE (methyl t-butyl ether) decomposition reaction. In ethanol dehydration diethylether was formed on the surface acid site of 12-tungstophosphoric acid, whereas ethylene was formed in the bulk acid site of the catalyst. It was revealed that water reinforced the bulk acid site of the catalyst, while organic base decreased the bulk acid function of the catalyst. The formation of acid sites of metal salts was due to hydrolysis of crystalline water and/or partial substitution of metal, and with hydrogen treatment, the acid site was reappeared. Also catalyst design as a selective oxidation catalyst was possible by controlling acid function of heteropoly acid catalyst.
고압인젝터 밸브시트 형상이 정적유량 특성이 미치는 영향
김형진 ( Hyoung Jin Kim ),송재천 ( Jae Cheon Song ),박중원 ( Jung Won Park ),박정환 ( Jeong Hwan Park ),김태영 ( Tae Young Kim ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
Objective of this numerical study is to investigate static flow rate characteristics according to valve seat configuration of GDI multi-Hole injector. The valve seat used in this work was adapted to laser drilling Hole in order to improve spray performance(atomization, penetration, etc.) and pollutant emission. To understanding key parameter influenced on static flow rate was performed to CFD simulation by STARCCM+. In the steady state condition, RANS(Reynolds Average Navier-Stokes) turbulent flow model was applied to this simulation. Inlet pressure of valve seat is 100bar, Outlet pressure is 1bar and working fluid is N-Heptane. As the Result, key parameter influenced on static flow rate was edge height(H), edge diameter(D). On the other hand, internal flow area(A) and sac volume(Vsac) have not an effect on the static flow rate. Commonly, caviation phenomenon in spray Hole was occurred due to rapidly pressure drop. Physically, decrease in effective cross-section area was caused by cavitation occurrence in spray Hole. And, spray velocity and spray pressure was changed on a Case by Case basis. That is, cavitation generation point in valve seat mainly has effect on static flow rate. Therfore, design management of edge height(H) and diameter(D) in valve seat is of prime imfortance.
고압 직분사식 가솔린 연료분사기의 노즐 홀 길이가 분무 거동 및 미립화에 미치는 영향
박정환 ( Jeong Hwan Park ),김형진 ( Hyoung Jin Kim ),송재천 ( Jae Cheon Song ),박중원 ( Jung Won Park ),신문성 ( Moon Sung Shin ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
Gasoline engine has been developed from PFI engine to GDI engine because global needs and exhaust regulations. GDI engine is well known for higher performance and combustion efficiency compared to PFI engine. However, the direction injection engine has emission problem like a PM, PN. Also, GDI engine must be reduced because of the enhanced emission control. In order to reduce the PM emission, GDI engine has more higher injection pressure from 100bar to 200bar. Because Higher injection pressure cause to lower SMD and good mixture formation. However, cylinder wall wetting is higher due to the longer spray penetration. Therefore, The purpose of this study is to optimize nozzle hole parameter, especially hole length. Spray penetration is proportional to hole length due to the spray momentum. But spray velocity of long nozzle is faster decrease than due to small SMD
박정환 ( Park Jeong Hwan ),신문성 ( Shin Moon Sung ),송재천 ( Song Jae Cheon ),박중원 ( Park Jung Won ),이강훈 ( Lee Kang Hun ),나유동 ( Na Yu Dong ) 한국액체미립화학회 2018 한국액체미립화학회 학술강연회 논문집 Vol.2018 No.-
The purpose of this study is to analyze spray hole parameters, especially spray hole diameter and spray hole length. These spray hole parameters are very important factor for spray preparation. Because GDI Engine is a direct injection system differently Port Fuel Injection. The Combustion physics can be changed according to the spray preparation in direct injection engine. So the study of spray hole parameter is essential to the development of a GDI engine and performance improvements. In order to analyze spray characteristics, Spray visualization system and PDPA system (Phase Doppler Particle Analyzer) was set up. Spray behavior Characteristic was analyzed using spray penetration length and spray atomization characteristic is studied using SMD value. Also, experiment was conducted using 1 hole and 6 hole GDI injector.