[논문]Experimental Study of Check Valves in Pumping Systems with Air Entrainment

Lee, Thong-See; Low, Hong-Tong; Nguyen, Dinh-Tam; Rong, Wei; Neo, Avan

doi:10.5293/ijfms.2008.1.1.140

Experimental Study of Check Valves in Pumping Systems with Air Entrainment 원문보기

International journal of fluid machinery and systems, v.1 no.1, 2008년, pp.140 - 147

Lee, Thong-See (Department of Mechanical Engineering, National University of Singapore) , Low, Hong-Tong (Department of Mechanical Engineering, National University of Singapore) , Nguyen, Dinh-Tam (Department of Mechanical Engineering, National University of Singapore) , Rong, Wei (Department of Mechanical Engineering, National University of Singapore) , Neo, Avan (Department of Mechanical Engineering, National University of Singapore)

Abstract ▼ AI-Helper

An experiment setup was introduced to study dynamic behaviour of different types of check valves and the effects of air entrainment on the check valve performance under pressure transient condition. The experiment results show that the check valves with low inertia, assisted by springs or small traveling distance/angle gave better performance under pressure transient condition than check valves without these features. Air entrainment was found to affect both wave speed and reverse velocity. With the increase of the initial air void fraction in pipeline, the experiment results show that the wave speed was reduced, the reverse velocity was increased. The first peak pressure increased initially and then decreased with the increase of the initial air void fraction, the pressure surge periods were increased proportionally with air void fraction due to the greatly reduced wave speed. The study can be applied to help choosing suitable check valves for a particular pumping system.

주제어

AI 본문요약
AI-Helper

* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.

제안 방법

The experiment results of the piston check valve were used to investigate further the effects of air entrainment. With air entrainment, wave speed at every point in systems depends on the local pressure and local air void fraction at that point.
The focus would be mainly on the downstream pressure transient since in reallife pumping station, it is the water hammer effect downstream of the check valves rather than upstream which poses a greater danger to the whole piping system. This study may help modifying criteria of selecting a proper check valve for pumping systems with air entrainment.

대상 데이터

1. The test facility consists of a 2 HP single pump with speed 1450 rpm, a head tank with overflow located 8.0 m above sump level, a nominal 89 mm diameter PVC piping of 15.75 m length, test section, a control valve and an air compressor. The pump supplies water from the basement tank to the head tank.

성능/효과

With the increase of the initial air void fraction in pipeline, the experiment results show that the wave speed was reduced, and the reverse velocity was increased. In combination with numerical studies, the results show that the first pressure peak increased initially and then decreased with the increase of the initial air void fraction, the pressure surge periods were increased proportionally with air void fraction due to the greatly reduce of wave speed. This is the reason why although selected check valve is satisfied for no air entrained system, valve slamming problem may still occur at a particular air entrainment level.
An experiment setup was introduced to study dynamic behaviour of different types of check valves and the effects of air entrainment on the check valve performance under pressure transient condition. The experiment results show that the check valves with low inertia, assisted by springs or small traveling distance/angle such as piston check valve, nozzle check valve and double flap check valve gave better performance under pressure transient condition than the check valves without these features such as swing check valve and ball check valve. Air entrainment was found to affect both wave speed and reverse velocity.
Air entrainment was found to affect both wave speed and reverse velocity. With the increase of the initial air void fraction in pipeline, the experiment results show that the wave speed was reduced, and the reverse velocity was increased. In combination with numerical studies, the results show that the first pressure peak increased initially and then decreased with the increase of the initial air void fraction, the pressure surge periods were increased proportionally with air void fraction due to the greatly reduce of wave speed.

참고문헌 (9)

Thorley, A. R. D., 1989, “Check valve behavior under transient flow conditions: A state-of-the-art review,” Journal of FluidsEngineering. Vol. 111, pp. 178-183.

상세보기
Provoost, A. G., 1982, “The dynamic characteristics of non-return valves,” 11th IAHR Symposium of the section on HydraulicMachinery equipment and cavitation; Operating problems of pump stations and power plants, Amsterdam.
Koetzier, H., Kruisbrink, A. C. H. and Lavooij, C. S. W., 1986, “Dynamic behaviour of large non-return valves,” Procs. 5th Int.Conf. on Pressure surges, BHRA, Hannover, pp. 237-244.
Megan, L., 2006, “Pipe down the chatter,” Water and Wastes Digest, Vol. 46, No. 3, pp. 24-26.
Ballun, J. V., 2007, “A methodology for predicting check valve slam,” Journal / American Water Works Association, Vol. 99,No. 3, pp. 60-65.

상세보기
Lee, T. S., 1995, “Numerical studies on effect of check valve performance on pressure surges during pump trip in pumpingsystems with air entrainment,” Int. J. for Numerical methods in Fluids. Vol. 21, pp. 337-348.

상세보기
Lee, T. S. and Leow, L. C., 2001, “Numerical study on effects of check valve closure flow conditions on pressure surges inpumping station with air entrainment,” Int. J. for Numerical Methods in Fluids.,Vol. 35, pp. 117-124.

상세보기
Lee, T. S., 1994, “Numerical modelling and computation of fluid pressure transients with air entrainment in pumpinginstallations,” Int. J. for numerical methods in fluids, Vol. 19, pp. 89-103.

상세보기
Brown, R. J., 1968, “Water-column separation at two pumping plants,” J. Basic Eng., ASME, pp. 521-531.

저자의 다른 논문 :

원문 URL 링크

DOI : 10.5293/IJFMS.2008.1.1.140 [무료]
Japan Science and Technology Information Aggregator, Electronic : 저널> 권호 > 논문 [무료]
DBPia : 저널
AccessON : 저널

*원문 PDF 파일 및 링크정보가 존재하지 않을 경우 KISTI DDS 시스템에서 제공하는 원문복사서비스를 사용할 수 있습니다.

오픈액세스(OA) 유형

GOLD

오픈액세스 학술지에 출판된 논문

내보내기 메뉴

내보내기 구분

파일저장
인쇄
메일전송

구성항목

기본정보
상세정보

관리번호, 논문명, 저널/프로시딩명, 저자 , 발행년, 권, 호, 시작페이지, 끝페이지, 발행기관

저장형식

Text(ASCII format)
Excel format
RefWorks Direct Export
RIS format (for Reference Manager, ProCite, EndNote), Scholar's Aids, Mendeley

메일정보

받는사람 (필수): @
보내는사람 (선택): @
제목
내용: KISTI 검색결과 이메일 서비스

안내

총 건의 자료가 검색되었습니다.

다운받으실 자료의 인덱스를 입력하세요. (1-10,000)

검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다.

데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요)

다운로드 파일은 UTF-8 형태로 저장됩니다.
파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오.

Text(ASCII format)
Excel format

표제어: PCR

동의어: Packet Collision Rate

용어 설명 출처 목록 (6)

용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

AI-Helper ※ AI-Helper는 을 사용합니다.

AI-Helper

안녕하세요, AI-Helper입니다. 좌측 "선택된 텍스트"에서 텍스트를 선택하여 요약, 번역, 용어설명을 실행하세요.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.

연합인증