• 제목/요약/키워드: Mixing fuel

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PROGRESS IN NUCLEAR FUEL TECHNOLOGY IN KOREA

  • Song, Kun-Woo;Jeon, Kyeong-Lak;Jang, Young-Ki;Park, Joo-Hwan;Koo, Yang-Hyun
    • Nuclear Engineering and Technology
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    • 제41권4호
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    • pp.493-520
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    • 2009
  • During the last four decades, 16 Pressurized Water Reactors (PWR) and 4 Pressurized Heavy Water Reactors (PHWR) have been constructed and operated in Korea, and nuclear fuel technology has been developed to a self-reliant state. At first, the PWR fuel design and manufacturing technology was acquired through international cooperation with a foreign partner. Then, the PWR fuel R&D by Korea Atomic Energy Research Institute (KAERI) has improved fuel technology to a self-reliant state in terms of fuel elements, which includes a new cladding material, a large-grained $UO_2$ pellet, a high performance spacer grid, a fuel rod performance code, and fuel assembly test facility. The MOX fuel performance analysis code was developed and validated using the in-reactor test data. MOX fuel test rods were fabricated and their irradiation test was completed by an international program. At the same time, the PWR fuel development by Korea Nuclear Fuel (KNF) has produced new fuel assemblies such as PLUS7 and ACE7. During this process, the design and test technology of fuel assemblies was developed to a self-reliant state. The PHWR fuel manufacturing technology was developed and manufacturing facility was set up by KAERI, independently from the foreign technology. Then, the advanced PHWR fuel, CANFLEX(CANDU Flexible Fuelling), was developed, and an irradiation test was completed in a PHWR. The development of the CANFLEX fuel included a new design of fuel rods and bundles.. The nuclear fuel technology in Korea has been steadily developed in many national R&D programs, and this advanced fuel technology is expected to contribute to a worldwide nuclear renaissance that can create solutions to global warming.

충돌제트의 유량분포 및 혼합특성에 관한 실험적 연구 (An experimental study on flow distribution and mixing in impinging jets)

  • 이충훈;정영호;정석호
    • 대한기계학회논문집B
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    • 제21권1호
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    • pp.99-112
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    • 1997
  • Mixing process of impinging jets of liquid oxidizer and liquid fuel is simulated by using water and sodium carbonate (Na$_{2}$CO$_{3}$) solution. The shapes of liquid sheets are visualized and flowrate distributions are measured by collecting droplets using measuring cells. Mixing charateristics are studied by using acid-base titration. Stable liquid sheets are formed and two liquid jets are well mixed for symmetric impinging jets. Similarity in flowrate distribution for various measuring heights is observed. For asymmetric impinging jets, liquid sheets become unstable as the difference in the velocities of jets increases. In some extreme cases, liquid sheets are not formed and the jets are separated. Dimensionless variables are adopted demonstrating similarly in flowrate distribution. Mixing characteristics vary significantly with experiment conditions.

냉각 파일런 분사를 이용한 스크램제트 연소기 내 혼합증대 (Mixing Augmentation with Cooled Pylon Injection in Scramjet Combustor)

  • 이상현
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2009년도 제33회 추계학술대회논문집
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    • pp.594-597
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    • 2009
  • The mixing characteristics of pylon injection in a Scramjet combustor and effects of film cooling to protect pylon from air-heating. Three-dimensional Navier-Stokes equations with $k-{\omega}$ SST turbulence model were used. Fuel hydrogen and air were considered as coolants. There were remarkable improvements of penetration and mixing rate with the pylon injection. There also over-heating on the front surface of pylon without film cooling. The coolant injected parallel to the front surface of the pylon protect the pylon from over-heating.

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액체로켓용 Unlike-doublet 인젝터의 혼합특성 연구 (A Study on Mixing Characterization of Unlike-doublet Injector for Liquid Rocket Engine)

  • 이인수;정기훈;임병직;윤영빈
    • 한국분무공학회지
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    • 제7권1호
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    • pp.21-28
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    • 2002
  • The mixing of propellant and its mass distribution of unlike-doublet impinging injector, which is known to affect the combustion efficiency significantly, have been studied using PLIF(Planar Laser Induced Fluorescence). The results show that fuel jet penetrates considerably into the oxidizer jet at impinging point as variation of momentum ratio. and then stream flows inclined because of variation of momentum ratio. Consequently, the mixing efficiency shows that maximum efficiency is at MR=3. after MR=3, mining efficiency decreases slightly.

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