인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
This paper investigates the concept of fractal grid as turbulence generator which has constant reduce rate of grid thickness in low swirl combustor. Turbulence performance comparison of with and without swirler in a non-reactive isothermal flow of model nozzle was investigated using a fractal grid with various RRBT ratios and a general grid with conventional perforated hole configuration. As comparison barometers of turbulence performance, turbulence mean velocity(Ū), turbulence fluctuation(u′) and turbulence intensity (u′/Ū) were investigated. For all the case, the turbulence intensity of fractal grid was higher than the general grid based on perforated holes. A maximum u′ showed to locate at a minimum position of Ū, which is consistent with wake interaction theory. Also, the turbulence intensity increased with smaller value of RRBT in fractal grid. With a constant bulk velocity of 6 ㎧, the inner recirculation zone was not detected by using a PIV system and a hot-wire anemometry analysis with radial direction, which is a very important phenomenon to meet the low swirl combustion.
본문·목차
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오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.