[解說] 吸氣管內의 液膜流動의 液膜두께 測定方法

전흥신(Heung-Shin Jeon),박경석(Kyoung-Suk Park) 한국자동차공학회 1988 오토저널 Vol.10 No.2

기체온도 측정을 위한 초음파 계측에 관한 연구

윤천한,최영,전흥신,Yoon, Cheon Han,Choi, Young,Jeon, Heung Shin 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.7

Measuring temperature with ultrasonic wave apparatus is desirable in the cue of gas below $300^{\circ}$ because of the fact that the temperature of gas is the function of only sound velocity. In this study, being used a heatable wind channel and a blower. the variation of temperature is observed in accordance with flow rate(air velocity). The frequency modulation method is used to measure the temperature which is varying in hot air flow up to $100^{\circ}$. The length changed in the position of ultrasonic sensors is considered. Also. the effects of air velocity at the same temperature and various facing angles of ultrasonic sensors are considered. As a result of this study. it has been found that the temperature in gas flow is correctly measured regardless of both the distance of ultrasonic sensors and the variation of air velocity. and that there is just a little influence of facing angles.

논문발표회 / 제 1 강연장 ( 수치해석 ) : 가솔린 엔진내에서의 연료 액적의 기화과정

임종한(Lim Jong Han),전흥신(Jeon Heung Shin),박경석(Park Kyoung Suk) 한국액체미립화학회 1995 한국액체미립화학회 학술강연회 논문집 Vol.- No.-

논문발표 / 제 3 강연장 ( 예측 및 분무특성 ) : 내 외부 혼합식 이유체 분사노즐의 분무특성에 관한 연구

김경만(Kim Kyung Man),윤준규(Yoon Jun Kyu),전흥신(Jeon Heung Shin) 한국액체미립화학회 1996 한국액체미립화학회 학술강연회 논문집 `96 Vol.- No.-

LPG 전자 제어 연료 분사 시스템 개발

전흥신,오환섭 경희대학교 산학협력기술연구원 1995 산학협력기술연구논문집 Vol.1 No.-

In recent, LPG vehicle and CNG vehicle attract strong attention instead of conventional vehicles, which is pointed out as the origin of air pollution in large cities. For LPG vehicles discharge less harmful exhaust gas than gasoline vehicles. So far, the decrease of the harmful exhaust gas in gasoline vehicles is accomplished with the newly fuel supply system, that is , the electronic control fuel supply system, which was developed, after the conventional carburetor and the feed back carburetor. The objective of this study is to develope electonic control fuel injection system for LPG engines. It can be done by the use of the electronically controlled injector instead of LPG feed back mixer. The study planned as three year research. The first year research emphasized on the acquistion of basic data, which are review of the LPG fuel supply systems, the performance test of the gasolin injector and the design of the LPG fuel injector.

S.P.I식 내연기관의 흡기관내 연료 거동에 관한 연구

전흥신 慶熙大學校 1997 論文集 Vol.26 No.-

This paper is an experimental study on the fuel spray behavior in the intake manifold of internal combustion engine with S.P.I.. For the Improvement of spray behavior in the intake manifold, a twin fluid type atomzer is considered as S.P.I. injector in stead of pressure type injector. On the basis of the experimental results about the mechanism of a spray transport and liquid film flow rates on intake manifold wall, conlusions are as follows : (1) Liquid film flow rates are influenced by throttle valve openning angle and spray droplet size. (2) Maximum local droplet deposit rate is the second region which is the near the intersaction point of the spray angle and the inner wall surface, liquid deposit rate of the second region is over 60% of the total liquid film flow rates. (3) In the case of the small openning angle of the throttle valve, large liquid film recirculation flow are occured in the just back and lower part of throttle valve, it seems to be kind of different droplet mass flux according to the cross section of the intake manifold, finally it seems to be a poor effect on the engine performance. (4) The main reasion of droplet deposite to the inner walls are not only the droplet eddy difusivity, but also momentum of spary droplet issued from injector.

소형 가시화 시험 엔진 개발(Ⅰ)

전인곤,김용덕,전흥신 경희대학교 산학협력기술연구원 1998 산학협력기술연구논문집 Vol.4 No.-

University, college and Technical high school those have a department of mechanical engineering need a experimental practice engine form educational machinery and using this practice student in structure of engine, operation and efficiency characteristics. But, because the engine that they have purchased is for vehicles, agriculture and industry, it is not available to experimental practice, can't alter fuel and the ration of compression and also the combustion process is not visible so efficiency of education for practical machinery is very low. In this study, a fuel, ignition time, the ration of compression is alterable and we design a single cylinder 4-cycle engine of 60~100cc rate of stroke volume with a heat-proof glass that is visible.

원관내 분류의 유동장 특성에 관한 연구 : -이유체 분사노즐을 사용한 경우-

임종한,전흥신 慶熙大學校 레이저 工學硏究所 1997 레이저공학 Vol.8 No.-

This study is intented to clarify the flow pattern in the flow developing region of an asisymmetric confined jets which has the primary stream with water jet issuing into the surrounding stream. Experiments were performed to investigate pressure variation, foundamental structure of confined jets flow and liquid flux distribution. If Ct number is less than 0.9, recirculation region be created in confined jets. Recirculation region exist in x=3R∼5R from twin-fluid injector exit. Axial pressur variation of confined jets is positive slope, the positive pressure slop increases with Ct number and constant pressure variation exist in x=14R position. The flow-field of confined jets is affected by velocity and diameter ratios of primary and secondary, and has Gauss distribution. Liquid flux distribustion is much affected by primary stream condition, but is little affected by secondary stream condition.

고온벽면 충돌에 의한 미립화

전인곤,전흥신 경희대학교 레이저공학연구소 2004 레이저공학 Vol.15 No.-

The breakup behaviors of impinging droplet on a hot surface are studied experimentally. The droplets are produced by the dripping method and the breakup behaviors of liquid droplet are recorded by photographs. Experimental conditions are, droplet diameter di : 2.5, 3.2 [mm], Weber number : 30∼140, surface temperature : 28℃ (room temperature) 450℃. Water is used as a liquid. As Weber number of droplet increases, a liquid sheet, which is formed after the impingement on a hot surface, is disintergrated by the dynamical effect. But at low Weber number, it has effected by thermodynamical effect. The breakup behaviors of droplet are divided into three patterns with Weber number and surface temperature, non-disintegration, transition and disintegration region. Further, these boundary values are affected by the hot surface temperature and Weber number. S11M of breakup droplets are calculated in according to surface temperature and Weber number. The minimum SMD of breakup droplets are observed at Weber number 65.49, temperature 250℃ and Weber number 99.08, temperature 350℃

車輛燃料節減을 위한 세라믹히터裝置 開發硏究

전흥신,김흥수,김준수 慶熙大學校 1998 論文集 Vol.27 No.-

In a carburating system, the fuel keeps vaporizing after sprayed to the carburator as droplets. But in the case of cold weather, plenty of them remain in the liquid phase, causing the increase of fuel consumption rates and harmful exhaust gas amounts. Those problems were known to be solved using the PTC ceramic heater for heating up the fuel into the cylinder in being supplied. Purpose of this research is the development of a PTC ceramic heater for automotive fuel saying. This research emphasized the fabrication of newly developed step-shaped PTC heaters assembly and the obtaining the application result after installing them on the 1500cc engine. The combustion pressure, the indicated mean effective pressure, the fuel consumption rate, the heat release, tile burned mass fraction of gas of the engine between with and without the PTC heater were compared as a function of crank angle. The reults were as follow: 1) With the PTC heater installed, the deviations of the maximum combustion pressure and the indicated mean effective pressure were improved by 2.0% and 0.8%, which brought the smoothing of drivability and the increase of engine power compared with engine without the heater. 2) The fuel consumption rates per unit power with PTC heater installed at 2000 rpm and the boost pressure of 300 mmHg and 400 mmHg were increased by 0.6∼8.1% compared with no PTC heater. 3) With 180℃ newly developed PTC heater installed, heat release time delays at the boost pressure of 300mmHg were made quicker by 1∼3 deg and the main combustion time by 5 deg compared with no PTC heater. 4) The 180℃ heater was the most effective of the three developed ones. 5) The introduction of new PTC heater improved the engine performance, which could bring the fuel saving and reduction of the harmful exhaust gas.