Analysis of the Influence of Temperature Gradient on Bell Prover Gas Flow Standard Device
The temperature distribution of the enclosed gas inside the bell under the steady-state condition can be described by the Laplace equation,and the temperature at the boundary isotherm is a vertical one-dimensional linear equation gradient distribution.The coordinate system was established,the position of the bell was absolutely encoded,and the linear equation was obtained by the two-point temperature measurement method.Considering the influence of humidity,the nonlinear one-dimensional distributed gas density function is derived,and the spatial integration is car-ried out to obtain the gas mass function in any height range of the bell,and then the mass flow function is derived.When the gas flow satisfies the adiabatic isentropic process,according to the continuity equation,the volume flow function of the state at the location of the flowmeter is derived,which effectively solves the problem of temperature measurement response lag.The example calculations show that the substitution of point temperature for gradient tem-perature will introduce significant systematic error to the mass of the bell exhaust gas,and the density must be cor-rected by spatial integration.
bell provergas flowstandard devicetemperature gradientmolar fraction
万方数据
维普
