http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유량측정 오차에 미치는 유동조건의 영 향 검출방법 연구
이광복,최해만,백종승,Lee, K.B.,Choi, H.M.,Paik, J.S. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.1
The effect of flow conditions on flow measurement is difficult to identify from the inherent characteristics of the flowmeters and flow standard system. A new experimental approach has been attempted to detect the turbine meter error due to inlet flow conditions. In this try not only the design of the turbine meter package but also the data analysis method was altered. It was found that k factor slope of the turbine meter responds to the change of flow conditions in the test line with higher sensitivity than the degree of the data scattering. The flow standard system of $0.1m^3/s$ was chosen for the investigation. The systematic and random error of the system were less than ${\pm}0.08%$ and ${\pm}0.13%$ respectively.
임재명(J.M. Lim),박경암(K.A. Park),윤복현(B.H. Yoon),최해만(H.M. Choi) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
The aim of this paper is to develop the technology of minute gas flow-rate, which is very important in the fields of semiconductor process and NT(Nano Technology). To reach the aim mentioned above we developed the following measurement method. Firstly, we manufactured several some nozzles of the same throat diameters with the same configuration, and calibrated them by means of the standard measurement system. Then we selected a group of sonic nozzles with the similar characteristics. Lastly, we instituted some nozzles from one nozzle in the upstream and other some nozzles from two nozzles in the downstream. In this way we could all the flow-rates(discharge coefficient) for the some nozzles of the same nominal throat diameter.
최용문(Y. M. Choi),박경암(K. A. Park),최해만(H. M. Choi),이기성(K. S. Lee) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
Thermal mass flow meter (TMF) is used measuring the small mass flow rate of gases. Generally, flow rate measuring accuracy of TMF is ±2% of full scale. TMF is manufactured for specified working pressure and specified working gas by customer. If it were applied for different working pressure and gases, flow rate measurement accuracy decreased dramatically. In this study, a TMF tested with three different gases and pressure range of 0.2 MPa to 1.0 MPa. Effect of specific heat cause to increase flow measurement error as much as ratio of specific heat compare with reference gas. Pressure change cause to increase flowrate measurement deviation about -0.2% as the working pressure decreased 0.1 MPa.
배관 형상이 다회선 초음파 유량계의 특성에 미치는 영향
박경암(K. A. Park),최용문(Y. M. Choi),최해만(H. M. Choi),윤병로(B. R. Yoon),황규보(K. B. Hwang) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
Five-path ultrasonic flowmeters (200 and 300 ㎜ diameters) were tested to obtain it's characteristics in a water flow standard system. A five-path ultrasonic flowmeter was installed after various pipe fittings (elbow, valve, tee) or a pump. The distance between flow disturbance source and a flowmeter was main experimental parameter. Without a flow conditioner, a five-path ultrasonic flowmeter shows good characteristics as the distance between flow disturbance source and a flowmeter is longer than 10 diameter of a flowmeter.