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이상득(S. D. Lee),강희영(H. Y. Kang),고대권(D. K. Koh),안수길(S. K. Ahn) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The pressure fluctuation in the intake and exhaust pipe of 4 stroke-cycle diesel engine is caused by reciprocating motion of piston for suction of fresh air and exhaust of burned gas. this gas dynamic effect can be utilized for increase the volumetric efficiency. Many empirical studies have been carried out to investigate the effects of intake pulsating flow on the volumetric efficiency. However, when the gas dynamic effects are utilized for the variable speed engine to increase its performance, The speed range in which the volumetric efficiency is maximum is limited and there occurs some difficulties in lay-out of intake system because it become too long. During induction process, as waves travel both directions, they are reflected and interacted each other and pressure waves are transmitted through it. Hence, the flow becomes more complex and unsteady flow. These pressure waves act upon intake pulsating flow and affects on the volumetric efficiency. In this paper the effects of pulsating flow of intake and exhaust pipes on volumetric efficiency were examined and evaluated. It was found that volumetric efficiency was affected by pulsating flow of intake and exhaust pipes.
염기촉매를 이용한 핵사플루오로프로필 메틸 에테르의 합성
이상득,김홍곤,우주영,이태환 한국공업화학회 2001 응용화학 Vol.5 No.2
Preparation of 1,1,2,3,3,3-hexafluoropropyl methyl ether, a prospective alternative to CFC-11, has been studied under basic conditions. Strong basic catalyts are more favorable to the etherification of hexafluoropropylene with CH₃OH than weak basic catalyts. The reaction temperature should be kept below 30℃ in order to produce a high yield and a high selectivity of the ether product.