기체 온도가 Annubar<SUP>Ⓡ</SUP>형 차압유량계 유량 특성에 미치는 연구

다국어 초록 (Multilingual Abstract)

A shape improved flow meter which has a similar structure of Annubar<SUP>®</SUP> type flow meter was designed and its flow rate characteristics were evaluated by calibrating the flow rate of the flow meters. The supplying air temperature was maintained constantly by controlling power supply to electric heater during the calibration. Two kinds of differential pressure measured at the flow meter were used in calculating the H parameter which represents characteristics of the flow meter. The H parameter was calculated based on the differential pressure which is the difference between upstream and downstream pressure tabs of the flow meters. The other parameter was calculated based on the differential pressure which is the difference between upstream pressure of the flow meter and static pressure ,that is, the dynamic pressure of the flow in the flow meter. Relationship curves between the non-dimensional parameters and mass flow rate at the flow meter were obtained. The curve based on the differential pressure obtained from the difference between up and down stream pressure tabs show different gradients with varying the controlled air temperature. However, the other curve based on the dynamic pressure shows the same gradient with varying the air temperature.