RESEARCH ON CALCULATION METHOD OF TANK'S LEAKAGE FLOW RATE BY DIFFERENTIAL PRESSURE COMPARISON

摘要

By measuring the variation of differential pressure between a master tank (without leakage) and a measured tank (with leakage), leakage flow rate of the measured tank can be calculated. In this research a new calculation method is studied for measuring air leakage flow rate. Based on the law of air flow through a leakage hole, the theoretical formula of the leakage flow rate which has unacquainted parameters is got. By using statistics method, the unacquainted parameters in the mathematic model of the differential pressure, namely the unacquainted parameters in the theoretically formula of leakage flow can be estimated by differential pressure from experiment. Thereby leakage flow can be calculated and the error of leakage flow can also be determined. Compared with mass flow meter as standard measurement, the accuracy of leakage flow rate by the new method is higher than by the traditional method.