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곡관의 하류에 설치된 전자기유량계의 유량신호 특성에 관한 실험적 연구(난류 유동)
An Experimental Study on Installation Effects of Pipe Elbow on the Electromagnetic Flowmeter Characteristics (Turbulent Flow)

임기원   (한국표준과학연구원 유체유동그룹CC0187000  );
  • 초록

    An electromagnetic flowmeter(EMF) essentially averages the velocity distribution over the pipe cross- sectional area, and the measured value is dependent on the velocity profiles. In this study, installation effects of 90 $^{\circ}$ long elbow(KS B 1522, ISO 3419) on the EMF characteristics was investigated. A commercial EMF was adopted and the distribution of magnetic field in the electrodes cross section was measured. In the experiment, the national flow standard system, of which measurement uncertainty was evaluated in accordance with ISO 17025 recommendation, was used fur characterization of EMF. The leading line has 150D long straight pipe to established a fully developed flow before entering into the elbow and the elbow was installed downstream of it. then the flowmeter was tested within 50 D from the elbow. The installation effects of the flowmeter were investigated by varying the mean velocity(Reynolds No.)in pipe section, the locations and the direction of electrodes plane.( $\phi$ ) From the experimental results, we find the optimal conditions to get most accurate measurements. Generally, the deviations from the calibration value were less than 0.5 % in farther than 10D distance from the elbow and the direction of electrode plane. $\phi$ = 90<T 90 $^{\circ}$ yielded the smallest measurement deviation. These characteristics were shown consistently in turbulent region regardless of the mean Reynolds number.


  • 주제어

    전자기유량계 .   설치효과 .   전압방정시 .   가중함수법 .   교정 .   긴곡관 .   전자유체역학.  

  • 참고문헌 (12)

    1. Ki Won Lim, Myung Kyoon Chung, 1999, 'Numerical Investigation on the Installation Effects of an Electromagnetic Flowmeter Downstream of a 90° Elbow-Laminar Flow Case,' Flow Measurement and Instrumentation, Vol. 10, pp. 167-174 
    2. Luntta E. and Halttunen J., 1989, 'The Effect of Velocity Profile on Magnetic Flow Measurement,' Sensors and Actuators, Vol. 16, pp. 335-344 
    3. Kuromori, K., 1993, 'An Electromagnetic Flowmeter with Plural Pairs of Electrodes (in Japanese),' J. of the Society of Instrument and Control Engineers, Vol. 29, pp. 1413-1420 
    4. JIS B 7554, 1993, 'Electromagnetic Flowmeters(in Japanese).' 
    5. Bevir M. K., O' Sullivan V. T. & Wyatt D. G., 1981, 'Computation of Electromagnetic Flowmeter Characteristics from Magnetic Field Data,' J.Phys. D:Appl. Phys., Vol. 14, pp. 373-388 
    6. ISO 4185, 1980, 'Measurement of Liquid Flow in Closed Conduits-Weighing methods.' 
    7. ISO, 1993(E), 'Guide to The Expression of Uncertainty in Measurement(1st edition).' 
    8. Ki Won Lim, 2001, 'A Study on the Measurement Uncertainty of Flowmeter Calibrator,' J. of KSME(B), Vol. 25, No. 4, pp. 561-571     
    9. Ki Won Lim, 1994, 'Standard Calibration Procedure of an Electromagnetic Flowmeter,' KASTO-94-10-408-107 
    10. Shercliff J.A., 1954, 'Relation Between the Velocity Profile and the Sensitivity of Electromagnetic Flowmeters,' J. Appl. Phys., Vol. 25, pp. 817-818 
    11. Bevir M.K., 1970, 'The Theory of Induced Voltage Electromagnetic Flowmeters,' J. Fluid Mech., Vol. 43, pp. 577-590 
    12. Engl, W.L., 1970, 'Der Induktive Druchflussmesser mit Inhomogenem Magnetfeld,' Arch. fur Electrotechn., Vol. 5, No. 6, pp. 126-134 
  • 이 논문을 인용한 문헌 (3)

    1. Lim, Ki-Won 2003. "Design and Fabrication of an Electromagnetic Flowmeter" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 27(10): 1385~1392     
    2. Lee, Dong-Keun ; Park, Jong-Ho 2008. "A Study on Error Characteristics of Large Size Electromagnetic Flowmeter in the Range of Low Velocity" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 32(3): 235~240     
    3. Lim, Ki Won ; Jung, Sung Soo 2016. "Flow Signal Characteristics of Small Scale Electromagnetic Flowmeter in Low Conductivity Fluid Measurement" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 40(9): 613~620     

 저자의 다른 논문

  • 임기원 (15)

    1. 1990 "소형 푸루버의 유량계 검증 오차 연구" 大韓機械學會論文集 14 (1): 259~266    
    2. 1999 "곡관의 곡률에 따른 전자기유량계 설치효과의 수치모사에 의한 특성 예측(충류)" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B 23 (11): 1453~1463    
    3. 2000 "국가교정검사기관(액체유량)의 측정불확도 평가 및 비교연구" 설비공학논문집 = Korean journal of air-conditioning and refrigeration engineering 12 (11): 1012~1019    
    4. 2000 "공기실이 설치된 건축물 급수관로의 과도압력 특성" 설비공학논문집 = Korean journal of air-conditioning and refrigeration engineering 12 (8): 782~790    
    5. 2000 "파이프 프루버의 측정불확도에 관한 연구" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B 24 (10): 1388~1398    
    6. 2001 "A Numerical Study on the Reduction of Water Hammering in a Simple Water Supply Pipe System" International journal of air-conditioning and refrigeration 9 (2): 51~61    
    7. 2003 "기름 유량표준장치의 개발 및 측정 불확도에 관한 연구" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B 27 (8): 1071~1080    
    8. 2003 "전자기유량계의 설계 및 제작" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B 27 (10): 1385~1392    
    9. 2003 "코리올리스 질량유량계의 유량측정에 영향을 미치는 인자에 관한 실험적 연구" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B 27 (12): 1699~1707    
    10. 2004 "2개의 기준유량계를 이용한 유량계 교정장치의 측정불확도 평가에 관한 연구" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B 28 (10): 1219~1230    

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