A Feasibility Study of Simultaneous Measurement of Gas-Liquid Two-Phase Flowrate and Quality with a Sharp-Edged Orifice

차압유량계를 이용한 기액 2상유량 및 건도의 동시측정 가능성에 관한 연구

The feasibility of simultaneous measurement of gas-liquid tow-phase flowrate and quality with a sharp-edged orifice has been investigated. Instantaneous pressure drop curves were monitored for various combinations of gas and liquid flowrates in the bubbly flow regime and some statistical properties of the curves were calculated. The time-averaged value of pressure drop increases with increasing gas and liquid flowrate, whereas the mean amplitude and the intensity of fluctuation monotonically increase as void fraction becomes larger in the flow regime. The statistical furctions for the instantaneous curves indicate a consistent pattern throughout the flow regime and the probability density function, which as a single-peaked and symmetrical distribution, is well predicted by the Gaussian distribution function. The results indicate that simultaneous determination of two-phase flowrate and quality may be possible based upon the statistical analysis of instaneous pressure drop curves measured in a sharp-edged orifice.

본 연구에서는 이러한 가능성을 알아 보기 위하여 오리피스판을 통하여 기액 2상흐름이 있을 때 각 상의 유량변화레 따른 순간압력강하치를 분석하고자 한다. 우선 평균압력강하치를 측정하여 식 (1)과 비교 분석하며, 교란치의 평균진폭과 교란 강도를 구하여 기공율의 변화에 따른 이러한 통계치들의 경향을 고찰한다. 그리고 순간압력강하 곡선에 대한 통계함수들, 확률밀도함수(probability density function) 와 자기상관함수(auto-correlation function)을 구하여 이 들의 통계적 성질을 구명 하고 2상 유동량의 결정에 대한 교란치의 할동도를 토의한다.