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강희영(H. Y. Kang),고대권(D. K. Koh),안수길(S. K. Ahn) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Empirical experiments have been undertaken to investigate the effects of Intake Pulsating Flow on volumetric efficiency in a diesel engine which significantly affects to intake manifold of induction system. It is well known facts that the intake and exhaust gas exchange processes close relate to a diesel engine performance. In this paper the effects of change in length of the pipes and engine speed on volumetric efficiency was examined and evaluated to obtain a preliminary data which have a analytical solution basis on a non-linear one-dimensional unsteady flow by the method of characteristics. It was found that volumetric efficiency was affected by intake pulsating flow with engine speed and the pipe length. The results obtained were considered by adopting a theory of wave action.
가변 헬름홀츠 공진기가 다기통 디젤기관의 체적효율에 미치는 영향
강희영(H. Y. Kang),고대권(D. K. Koh),장세호(S. H. Jang),안수길(S. K. Ahn) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The volumetric efficiency is significantly affected by the behavior of pressure wave in induction system and exhaust pipe. By the motion of the piston, there exist pressure fluctuation in induction system which produce waves. Waves are propagated along a pipe bi-directional as they propagated through it, making compression wave and rare-faction(expansion) wave. These can affect to the volumetric efficiency. As a method of improvement of the volumetric efficiency and pollutant emission reduction particularly in transient engine speeds, a side-branch additional tunable helmholtz resonator on the secondary pipe of intake system is proposed by use of their acoustic vibrations. Some of results are presented which deal with their physical phenomena for the wave action of intake system in a four-stroke three cylinders diesel engine.
헬름홀츠 공진기에 의한 유사 흡기시스템의 비정상유동 특성
김경현(K. H. Kim),강희영(H. Y. Kang),강경은(K. Y. Kang),고대권(D. K. Koh),안수길(S. K. Ahn) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Unsteady flows in a semi-induction system was investigated to verify their characteristics. Inside of the induction system in a diesel engine, wave is generated and it affects significantly to breathing performance. The system consists of rotary valve, intake pipe and resonator. To make a air pulsation, a rotary valve was contrived and employed in this system. And also, A side-branched Helmholtz resonator is mounted in the intake pipe to enhance a breathing capacity. The phase and amplitude of the pulsating flow in an unsteady flow system were found to be the strong factor that could be significantly affects to charging capacity. Some of the results given from experiment are described.
Thermal Analysis for Dry Transport of a Shipping Cask
이주찬,강희영,윤정현,정성환,곽은호,Lee, J.C.,Kang, H.Y.,Yoon, J.H.,Chung, S.H.,Kwack, E.H. Korean Nuclear Society 1993 Nuclear Engineering and Technology Vol.25 No.2
본 연구에서는 법규에서 규정하고 있는 주변온도 38$^{\circ}C$의 정상수송조건하에서 수송용기의 건식수송조건에 대한 열해석을 평가하였다. 수송용기는 1회에 PWR 핵연료집합체 4개를 운반할 수 있는 용량을 가지며, 설계기준 핵연료는 연소도 38,000 MWD/MTU, 냉각기간 3년을 기준으로 하였다. 건식수송조건에 대한 열해석을 평가하기 위하여 COBRA-SFS 전산코드를 이용하였다. 수송용기 내부 cavity에 공기, 질소 및 헬륨가스를 채우는 세가지 조건에 대한 해석을 수행하였으며, 최대 핵연료봉의 온도는 수송용기 내부 cavity가 공기인 경우에는 277$^{\circ}C$, 헬륨인 경우에는 226$^{\circ}C$로 계산되었다. 이 값은 건식수송조건에서 수송용기 내부에 장전된 PWR 핵연료집합체가 열적으로 건전성을 유지하기 위한 규정온도보다 낮은 것으로 나타났다. The purpose of this study is to evaluate the thermal safety for dry transport of a shipping cask. Analysis condition was based on an ambient temperature of 38$^{\circ}C$ for normal heat condition. The cask was designed to carry 4PWR spent fuel assemblies with a burnup of 38,000 MWD/MTU and 3 years of cooling time. Thermal analysis was carried out by using the COBRA-SFS code. The fuel cavity was considered to be filled with air, nitrogen or helium gas for dry transport. The results of analysis showed that the maximum temperatures of fuel rod cladding in air and helium cavity would be 277$^{\circ}C$ and 226$^{\circ}C$, respectively, for 3 years of cooling time. These values were less than the specified temperature to maintain the thermal integrity of fuel assembly for dry transport.