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4행정 직접분사식 성층화 엔진용 2유체 분사기의 운전조건에 대한 성능연구(Ⅱ)
장창수(C.S.Jang),김승수(S.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The spray characteristics of a 2-phase injector for a 4-stroke DISC engine were studied following the previous study under identical title. While the previous experiments emphasized the macroscopic performances of the developed injector, microscopic view was concentrated on in the present paper to obtain more helpful basic data for the application to a real engine. The overall shapes of sprays from the 2-phase injector were captured using a TV imaging system. They included those informations on SMD of fuel droplets and fuel mass distributions at the end of an injection. The variances of the spray characteristics to the measuring positions and times were also investigated. As a result there were observations made on the effects of instantaneous ALR on the overall ALR. Two types of poppet bouncing, i.e., cyclic and secondary bouncing, were examined. While the former exhibited a beneficial effect on the atomization, the latter displayed a detrimental influence.<br/>
4행정 직접분사식 성충화 엔진용 2유체 분사기의 운전조건에 대한 성능연구
장창수(C. S. Jang),김승수(S. S. Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
The spray characteristics of a 2-phase injector intended to be installed on a direct-injection stratified-charge engine were studied using TV imaging system. The measured SMD of the spray was found to be around 15μm under various operating conditions. The higher the air supply pressure, air-liquid ratio, and ambient air density, the more finely atomized sprays were obtained from the injector. Experimental correlations obtained for the spray tip penetration and droplet SMD exhibited very similar tendencies to those from diesel injectors. Log-Bolzman function was turned out to be the best fitting one for the drop-size distribution. The secondary poppet bouncing, an unwanted characteristics observable from the current 2-phase injector and, yet, controllable with the adjustment of the spring constant, was shown to give a seriously detrimental effect on spray atomization.<br/>
[가솔린엔진] 고압 선회분사기 노즐의 성능-전산유체 해석
장창수(C.S. Jang),배충식(C.S. Bae),최상민(S.M. Choi) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A computational fluid dynamic tool was used to predict the performance of a prototype high-pressure swirl injector nozzle with respect to design parameters. Performance of the' prototype nozzle was investigated in terms of the flow rate and the initial spray angle. Design parameters included needle lift. needle-seat angles. orifice diameter and length. and needle-seat contact diameter. The most important parameter was found to be the orifice diameter. Transient flow rate was also examined. The needle-opening time was found to have influence on the linearity of the dynamic flow rate
장창수(C.S.Jang),김승수(S.S.Kim),최상민(S.M.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Correlations for predicting Sauter mean diameter(D32) with respect to operating conditions were obtained by energy considerations in intermittent air-assisted fuel atomization. It represents how each operating parameters such as injection pressure, ambient pressure, air-liquid mass ratio, and injected fuel mass influence atomization quality. A sphere model was introduced to illustrate the initial state of liquid fuel. When modified term including ALR, which had been obtained from an empirical equation of the previous study, was adopted to the original equation instead of ALR, the correlation predicted D32 more exactly. The current correlation exhibited favorable predictions of SMD compared to the prediction by empirical correlations at selected experimental conditions.<br/>
직접분사식 가솔린 엔진용 고압 선회식 분사기 개발을 위한 선행 연구
장창수(C. S. Jang),김승수(S. S. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
The Basic characteristics of an intermittent swirl generated fuel injection nozzle for a 4-stroke gasoline direct injection engine was investigated at operating pressure up to 2.0Mpa. It was fabricated by modifying the commercial MPI injector nozzle considering static flow rate and sac volume optimization. Its characteristics was compared with that of the base MPI injector nozzle. About 50% of flow rate was increased by means of needle lift and orifice geometry adjustment. Overall droplet SMD was decreased more than 30% at all experimental conditions. whereas the atomization quality was worse than that of base nozzle at the early stage of injection. Trend of atomization appeared to be inversely proportional fo the exit velocity of the injector nozzle. Extending current empirical correlation. spray SMD from the tested swirl injector is estimated to be about 21.5㎛ at the injection pressure 5MPa.
장창수(C.S.Jang),우동기(D.G.Woo),최상민(S.M.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
To use in GDI(Gasoline Direct Injection) engine. all parts of HPSI(High Pressure Swirl Injector) are designed and made. This Injector can be operated at 5.0MPa condition. Three types of swirl nozzle is built and tested. Ball type valve has better characteristics then conventional type. High pressure pumping system is constructed. Static and dynamic flow rate and spray angle of HPSI are mearured. Understanding of construction processes and major design factors in HPSI is acquired in this study.<br/>