Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Analysis of Flow Rate Distribution of Diffusers with Various Shapes

다양한 디퓨저 형상의 유량 분배 특성에 관한 수치해석 연구

  • Kim, Myoung Soo (Dept. of Energy System, Graduate School of Energy and Environment, Seoul Nat'l Univ. of Science and Technology) ;
  • Kim, Hoo Bae (Dept. of Mechanical Engineering, Graduate School of Industry, Seoul Nat'l Univ. of Science and Technology) ;
  • Choi, Hyoung Gwon (Dept. of Mechanical, Automotive Engineering, Seoul Nat'l Univ. of Science and Technology)
  • 김명수 (서울과학기술대학교 에너지환경대학원 에너지시스템공학과) ;
  • 김후배 (서울과학기술대학교 산업대학원 기계공학과) ;
  • 최형권 (서울과학기술대학교 기계자동차공학과)
  • Received : 2014.06.24
  • Accepted : 2014.07.21
  • Published : 2014.09.01
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Abstract

In this study, the distribution characteristics of diffusers with various shapes that are installed in an open-type thermal storage system are numerically investigated. Four diffusers are designed to distribute a working fluid evenly through the holes on bifurcated pipes. Three-dimensional steady simulations of incompressible laminar flow are conducted using commercial software (ANSYS-FLUENT). The simulation results show that both the bidirectional header-type diffuser and the H-type diffuser distribute the working fluid evenly whereas both the unidirectional and the bidirectional diffusers distribute the working fluid unevenly. The results also show that the H-type diffuser requires a higher head of pump than the bidirectional header-type diffuser. Therefore, the bidirectional header-type diffuser is recommended for use because it enables even distribution of the working fluid and requires a low head of pump.

본 연구에서는 개방형 축열시스템에 설치되는 다양한 형상을 가진 디퓨저의 유량 분배 특성을 수치해석 하였다. 작동유체가 분기배관의 양 방향으로 나뉘어져 있는 구멍들을 통하여 균등하게 분배되도록 4가지 형상의 디퓨저를 설계하였다. 상용 해석 프로그램인 ANSYS-FLUENT을 사용하여 비압축성 유체의 3차원 정상 층류 유동으로 시뮬레이션을 수행하였다. 한 방향 또는 양 방향으로 분배되는 디퓨저는 유량이 일정하게 분배되지 않는 반면에 양 방향 헤더 형식과 H형 대칭구조의 디퓨저는 균등한 분배 특성을 보였다. 한편, H형 대칭구조의 디퓨저는 양 방향 헤더 형식 디퓨저보다 높은 펌프 양정을 필요로 하므로 유량분배도 일정하고 펌프 양정도 낮은 양 방향 헤더 형식 디퓨저가 최적임을 확인하였다.

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References

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