Model Study on the volume value of the gas discharged by high precision bell prover

摘要

This paper is based on the 0.1 class 2000L standard bell prover of gas flow which is the provincial highest measurement standard established by our institute. The research subject of this device is from the provincial science and technology special project of hebei province. In this paper, the concept of volume coefficient is proposed for bell provers with different accuracy levels. The common mathematical model is analyzed and a new Fourier fitting mathematical model is proposed. The mathematical model of the inner volume of the bell prover is given by the definite integral principle. The actual volume value of the gas discharged from the bell prover is derived by analyzing the starting and stopping process of the bell. That is the volume of the bell corresponding to the distance translated downward by the height of the bell falling which is measured by the displacement measuring mechanism. It is pointed out that in calibrating high accuracy grade bell prover, the effective use segment and its lower volume segment should be calibrated as well.