http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Experimental Study of Condensation Heat Exchanger in PAFS (Passive Auxiliary Feedwater System)
Seok Kim(김석),Byoung-Uhn Bae(배병언),Bok-Deuk Kim(김복득),Kyung Ho Kang(강경호),Byong-Jo Yun(윤병조) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
PAFS (Passive Auxiliary Feedwater System) is a passive cooling system on the secondary system of APR+ (Advanced Power Reactor Plus). It can replace the conventional active cooling system for auxiliary feedwater injection to the steam generator by a passive way, and it cools down the secondary system of the steam generator by heat transfer at the condensation heat exchanger installed in the PCCT (Passive Condensation Cooling Tank). To validate a cooling performance of PAFS, a separate effect test loop has been constructed at KAERI (Korea Atomic Energy Research Institute), which is named PASCAL (PAFS Condensing heat removal Assessment Loop). It simulates a single tube of the horizontal heat exchanger, which is equivalent to 1/240 of the prototype according to a volumetric scaling methodology. In this study, two-phase flow phenomena in a horizontal heat exchanger and PCCT (Passive Condensate Cooling Tank) for the facility were investigated and the cooling capability of the condensation heat exchanger was validated in the steady-state experiment. The experimental results in this study will contribute to validate a thermal hydraulic system analysis code or a CFD code for the multi-phase flow.
혼합날개가 장착된 봉다발부수로에서의 횡류유동의 광학측정 비교
장석규(Seok Kyu Chang),추연준(Yeon Jun Choo),김복득(Bok Deuk Kim),송철화(Chul Hwa Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The lateral crossflow on subchannels in a rod bundle array was investigated to understand the flow characteristics related to the mixing vane types on a spacer grid by using the PIV technique. For more measurement resolutions, a 5×5 rod bundle was fabricated a 2.6 times larger than the real rod bundle size in a pressurized water reactor. A rod-embedded optic array was specially designed and used for the illumination of the inner subchannels. The crossflow field in a subchannel was characterized by the type and the arrangement of the mixing vanes. At a near downstream location from the spacer grid (z/D<SUB>h</SUB>, = 1) in the case of the split type, a couple of small vortices were generated diagonally in a subchannel. On the other hand, in the case of the swirl type, there was a large elliptic vortex generated in the center of a subchannel. The measurement results were compared with the experimental results which had been performed with the LDV technique at the same test facility. The magnitudes of the flow velocity and the vorticity in PIY results were less than those in LDV measurement results. It was shown that the instantaneous flow fields in a subchannel frequently have quite different shapes from the averaged one.