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압축천연가스(CNG)용 고압분사 인젝터의 노즐 주위 3차원 충격파 거동 분석
문성준(Seong-Joon Moon),정수진(Soo-Jin Jeong) 한국자동차공학회 2020 한국자동차공학회 지부 학술대회 논문집 Vol.2020 No.6
To improve the air fuel ratio of in-cylinder of manifold port injection for CNG engine, the gaseous fuel should be injected at high pressure gas injector, which allows for sufficient fuel supply and good mixture formation in the cylinder. Nozzle design of the CNG injector are regarded as a critical design factor because they have a direct influence on the amount of fuel supply into cylinder and the jet characteristics around nozzle-exit of CNG injector. In this study to examine the design variables of nozzle tip by using DES based on Eulerian approach. In addition, the analysis results were verified by comparison of penetration length with test result of Schlieren and previous literature [4]. Our computational result is in a good agreement with the experimental results within an accuracy of less than 4.8%. Additionally, this study investigated the effect of size increase of nozzle tip on mass fraction rate by comparing two different phase fuels which the one is gaseous fuel and the other liquid fuel. As a result, when the nozzle-exit size is increased 5 times, the injection rate of liquid fuel is increased 10 times, but the injection rate of gaseous fuel is increased by 1.8 times. On the other hand, the inner stepped nozzle tip show much more strong inhibition effect on occurring mach-disk shock, resulting in good mixture formation even at higher injection pressure of 1.78 times comparing with of flated nozzle tip.
신준수(Joon Su Shin),김경순(Kyoung Soon Kim),강경환(Kyoung Hwan Kang),문성준(Seong Joon Moon),이우영(Woo Young Lee),김박광(Bak kwang Kim) 대한약학회 1996 약학회지 Vol.40 No.3
To investigate the antialopecic effect of N-4-salicylomide-2-amino-6-piperidinopyrimidine 3-oxide(SALMI) and its salt on the hair of black mouse (C57BL/6), this study was carried out. When salmi and its salt in ethanol solution were administered to the black mouse (C57BL/6) by route of skin, both of them promoted the growth of hair.
다구치 법을 통한 다이슬라이드식 사출성형의 공정파라미터 최적화
정수진 ( Soo Jin Jeong ),문성준 ( Seong Joon Moon ),정선경 ( Sun Kyoung Jeoung ),이평찬 ( Pyoung Chan Lee ),문주호 ( Ju Ho Moon ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
Die slide injection marvelously reduces the cost and time in processing plastic products because they can simplify the conventional process through eliminating additional process. However, this process must resolve some defects like whitening, resin infiltration, blowhole, Resin overflow, etc. In this study, the process parameters of the injection molding are optimized by using the finite element method and Taguchi method, The injection molding analysis is simulated by employing the Moldflow insight 2010 code and the 2nd injection is by adopting the Multi-stage injection code, The process parameters are optimized by using the L16 orthogonal array and smaller-the-better characteristics of the Taguchi method that was used to produce an airtight container (coolant reservoir tank) from polypropylene (PP) plastic material rodanwhile, the optimum values are confirmed to be similar in 95% confidence and 5% significance level through analysis of variance (ANOVA). rooreover, new products and old products were compared by mdasuring the dimensional accuracy, resulting in the improvement of dimensional stability more than 5%.