수평유로에서의 wire-probe를 이용한 수위 측정 연구

Abstract

Air-water two-phase phenomenon analysis is dealt with quite importantly in basis science research as well as various engineering systems including thermal-hydraulic systems of the nuclear power plant. Also, parameters such as void fraction, water level, interfacial structure in two-phase flow play a crucial role in heat and material transfer, safety analysis and engineering design of the nuclear power plant. Hence, it is essential to understand such parameters exactly for two-phase analysis. Due to these importance, a lot of experimental and theoretical research have been proposed. In this study, a pair of wire-probe sensor is manufactured and impedance method is applied to the sensor for basis experiment for measuring the water level which is one of the characteristic of air-water two-phase flow in horizontal stratified flow. Electrical signal varying as water level is measured by numerical analysis. Then static experiment is performed for verifying measurement performance of the wire-probe sensor. A pair of wire-probe sensor is possible to apply in the stratified flow as well as other flow regimes, but it is impossible to measure the interfacial approximately in irregular flow such as wavy flow. Therefore the number of wire-probe sensor increases for applying wire-probe sensor in different flow regimes. Thus 5 pairs of wire-probe sensors are manufactured for case of unspecific interfacial and verification experiment is performed.