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소닉노즐을 이용한 천연가스 유량측정에서 임계유동인자 계산 및 국제비교 결과
하영철,허재영,Ha, Youngcheol,Her, Jaeyoung 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.7
The sonic nozzle is widely used as reference device for calibrating flowmeters In gas flow measurement and its use requires the Critical Flow Factor(CFF) based on the thermodynamic properties of the gas at the nozzle throat. ISO-9300 provides the calculating method of the factor. But since the CFF from this method show an error over ${\pm}0.5%$ In specific conditions and of ${\pm}0.1{\sim}{\pm}0.2%$ in common Natural Gas(NG) custody transfer condition. this method cannot be applied for gas flow measurement with sonic nozzle. Each research bodies or organizations of the world have joined in order to calculate the CFF more accurately. They have performed these works using their own method and compared the results with each other under the management of ISO. KOGAS have joined those works, because the high-pressure natural gas flow calibration facility of KOGAS will be constructed in late 1999, and then had necessities to calculate a CFF accurately. The calculation method of KOGAS was using the equation of state from AGA-8('94), high accuracy model of ideal gas properties and the solutions of thermodynamic equations. The evaluation results have had a very good consistency within ${\pm}0.05%$ in most NO custody transfer conditions compared to the speed of sound for methane and also shown that the CFF was within ${\pm}0.1%$ compared to the results of other works of the world.
이승준(Seungjun Lee),이강진(Kangjin Lee),정종태(Jongtae Jung),하영철(Youngchul Ha),안승희(Seunghee Ahn),이철구(Chulgu Lee),허재영(Jaeyoung Her) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
Korea Gas Corporation(KOGAS) have constructed a gas flowmeters' calibration facilities at Jungdong Bucheon. The facilities consisting of 6 reference turbine meters can perform calibrations of large capacity natural gas flowmeters up to 9,600 ㎥/h at 95 kPa. This large capacity and high pressure natural gas facilities is traceable to the national standard of gas flow rate (KRISS). In this article the motive of construction and description of design are summarized.