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PIV 에 의한 상수도 배관용 틸팅디스크 체크 밸브의 손실저감에 관한 연구

PIV 에 의한 상수도 배관용 틸팅디스크 체크 밸브의 손실저감에 관한 연구. A PIV Study on Loss Reduction for Tilting Disk Check Valve Installed in Piping System of Water Supply. 발표자 : 이 중 열. 한국수자원공사 수도시설처. Research Purpose. ▶ 가압펌프장에 설치된 틸팅 디스크 체크밸브의 손상사고에 대한 유 체역학적인 원인규명이 부족함.

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PIV 에 의한 상수도 배관용 틸팅디스크 체크 밸브의 손실저감에 관한 연구

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  1. PIV에 의한 상수도 배관용 틸팅디스크 체크 밸브의 손실저감에 관한 연구 A PIV Study on Loss Reduction for Tilting Disk Check Valve Installed in Piping System of Water Supply 발표자 : 이 중 열 한국수자원공사 수도시설처

  2. Research Purpose ▶ 가압펌프장에 설치된 틸팅 디스크 체크밸브의 손상사고에 대한 유 체역학적인 원인규명이 부족함 ▶ 밸브 손상사고의 원인 규명을 위한 1차적인 유동특성파악 ▶ 유동장의 특성과 상관관계를 갖는 압력강하 메커니즘에 관한 실험 적 고찰 ▶ 손실 수두 저감 방안제시

  3. Photos of Tilting Disc Check Valve Front view Rear view

  4. Preliminary Experimentation 고해상도 고속도 카메라를 이용한 1차 예비 실험수행 유체역학적 접근을 통한 손실수두 발생원인 조사 밸브 내부 유동특성을 파악한 후 손실수두 저감 방안모색

  5. Experimental Conditions I

  6. Visualization Results Visualization photo of middle section (45 deg open) Visualization photo of side section (45 deg open)

  7. Visualization Results 45o열린 밸브중앙단면의 가시화결과, 비교적 균일한 흐름의 유동장을 형성하고 있음을 확인 45o열린 밸브 보스단면 가시화결과, 상당히 불규칙적인 유동장이 형성되고 있음을 확인 밸브 보스단면의 돌출형상에 의한 영향으로 유동방향으로 교란발생  압력 회복률 지연 보스단면의 형상을 유선형에 가깝게 변형  유동장의 안정화 기대  밸브 후방 압력회복률의 상승 기대  밸브 수두손실 감소

  8. Photos of Experimental Apparatus

  9. Definition of Measurement Position

  10. Arrangement of PIV System

  11. Pressure hole Pressure hole Photos of Experimental Apparatus Pre-improved model Improved model

  12. Experimental Conditions II

  13. Pressure Measurement 밸브 전·후방으로 모두 7개의 등간격 (60mm) 압력 공 설치 유량 : 30 liter/sec (밸브 완전개방시) 밸브개도 변화 : Full open, 15 deg, 30 deg, 45 deg, 60 deg Re = 183,311 (관경 : 0.05m, 유량 : 30m3/hr, 동점성계수 : 1.1565 X 10-6 m2/sec)

  14. Unit : mm 50 0 161 Pre-Improvement Model – Instantaneous Velocity Fields (Full-Open) Unit : mm 50 0 161 Improvement Model – Instantaneous Velocity Fields (Full-Open) Visualization results by PIV (Mid-section)

  15. Unit : mm 50 0 Pre-Improvement Model – Averaged Velocity Fields (Full-Open) Unit : mm 50 0 161 Improvement Model – Averaged Velocity Fields (Full-Open) Visualization results by PIV (Mid-Section) 161

  16. Unit : mm 50 0 161 Pre-Improvement Model – Instantaneous Velocity Profile (Full-Open) Unit : mm 50 0 161 Improvement Model – Instantaneous Velocity Profile (Full-Open) Visualization results by PIV (Mid-Section)

  17. Unit : mm 50 0 161 Pre-Improvement Model – Averaged Velocity Profile (Full-Open) Unit : mm 50 0 161 Improvement Model – Averaged Velocity Profile (Full-Open) Visualization results by PIV (Mid-Section)

  18. Unit : mm 50 0 161 Pre-Improvement Model – Instantaneous Velocity Fields (Full-Open) Unit : mm 50 0 161 Improvement Model – Instantaneous Velocity Fields (Full-Open) Visualization results by PIV (Side-Section)

  19. Visualization results by PIV (Side-Section) Unit : mm 50 0 161 Pre-Improvement Model – Averaged Velocity Fields (Full-Open) Unit : mm 50 0 161 Improvement Model – Averaged Velocity Fields (Full-Open)

  20. Unit : mm 50 0 161 Pre-Improvement Model – Instantaneous Velocity Profile (Full-Open) Unit : mm 50 161 0 Improvement Model – Instantaneous Velocity Profile (Full-Open) Visualization results by PIV (Side-Section)

  21. Unit : mm 50 0 Pre-Improvement Model – Averaged Velocity Profile (Full-Open) Unit : mm 50 0 161 Improvement Model – Averaged Velocity Profile (Full-Open) Visualization results by PIV (Side-Section) 161

  22. Unit : mm 50 0 161 Pre-Improvement Model – Instantaneous Velocity Fields (30 deg) Unit : mm 50 0 161 Improvement Model – Instantaneous Velocity Fields (30 deg) Visualization results by PIV (Mid-Section)

  23. Unit : mm 50 0 161 Pre-Improvement Model – Averaged Velocity Fields (30 deg) Unit : mm 50 0 161 Improvement Model – Averaged Velocity Fields (30 deg) Visualization results by PIV (Mid-Section)

  24. Unit : mm 50 0 161 Pre-Improvement Model – Instantaneous Velocity Profile (30 deg) Unit : mm 50 0 161 Improvement Model – Instantaneous Velocity Profile (30 deg) Visualization results by PIV (Mid-Section)

  25. Unit : mm 50 0 161 Pre-Improvement Model – Averaged Velocity Profile (30 deg) Unit : mm 50 0 161 Improvement Model – Averaged Velocity Profile (30 deg) Visualization results by PIV (Mid-Section)

  26. Unit : mm 50 0 161 Pre-Improvement Model – Instantaneous Velocity Fields (30 deg) Unit : mm 50 0 161 Improvement Model – Instantaneous Velocity Fields (30 deg) Visualization results by PIV (Side-Section)

  27. Unit : mm 50 0 161 Pre-Improvement Model – Averaged Velocity Fields (30 deg) Unit : mm 50 0 161 Improvement Model – Averaged Velocity Fields (30 deg) Visualization results by PIV (Side-Section)

  28. Unit : mm 50 0 161 Pre-Improvement Model – Instantaneous Velocity Profile (30 deg) Unit : mm 50 0 161 Improvement Model – Instantaneous Velocity Profile (30 deg) Visualization results by PIV (Side-Section)

  29. Unit : mm 50 0 161 Pre-Improvement Model – Averaged Velocity Profile (30 deg) Unit : mm 50 0 161 Improvement Model – Averaged Velocity Profile (30 deg) Visualization results by PIV (Side-Section)

  30. Results ( Full open )

  31. Results ( 15 deg )

  32. Results ( 30 deg )

  33. Results ( 45 deg )

  34. Results ( 60 deg )

  35. Conclusion 속도장의 분포에서 형상개선 후의 후류의 크기감소 효과를 알 수있 으며, 보스부 형상변형에 따른 영향으로 후류 억제의 효과를 얻음 속도프로파일 분포에서 형상개선 후의 시간평균 v 방향 속도성분이 개선전에 비해 낮은 값을 가지므로 밸브에 의한 유동교란의 감소, 방출후류의 감쇄, 이에따른 손실저감 효과를 얻음 압력측정 결과, 밸브가 완전열림 상태인경우 밸브 직후에서 22%, 2번 위치에서 12.2%, 대부분의 압력이 회복되었다고 판단되는 6번 위치에서 24.2%의 손실감소 효과를 얻을 수 있음 본 연구에서 제안한 밸브시트 형상개선의 효과는 우수한 성과를 제시함을 알수 있고, 추후 실제 모델을 제작하여 손실 저감 효과를 검증할 필요성이 있음

  36. Animation results by PIV (Mid-Section) Pre-Improvement Model – Averaged Velocity Profile (30 deg, Front Side) Improvement Model – Averaged Velocity Profile (30 deg, Front Side)

  37. Animation results by PIV (Side-Section) Pre-Improvement Model – Averaged Velocity Profile (30 deg, Front Side) Improvement Model – Averaged Velocity Profile (30 deg, Front Side)

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