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本文从流体力学基本原理出发,建立了变水头大流量标准装置流体流动的基本微分方程,运用Runge-Kutta方法求出了在水柜直径D=10m,8m,5m;水柜高度H_o=20m;试验管道直径d=1.2m等条件下用变水头大流量标准装置校验电磁流量计的一次近似解。计算结果表明,在阀门开启一段时间后,变水头大流量标准装置中水柜液面高度随时间成二次方关系变化;水柜液面下降的速度及试验管道中液体流量随时间的变化率为常值。利用上述特性有可能使用变水头大流量标准装置检定大口径流量仪表。本文对使用的方法进行了初步探讨,并讨论了变水头大流量标准装置的一些其它特性。
Based on the basic principle of fluid mechanics, this paper established the basic differential equation of fluid flow in variable head high flow standard device. The Runge-Kutta method was used to determine the water tank diameter D = 10m, 8m, 5m and the water tank height H_o = 20m. Test pipe diameter d = 1.2m and other conditions with variable flow head standard device calibration electromagnetic flowmeter an approximate solution. The calculation results show that after the valve is opened for a period of time, the liquid level of the water tank in the variable head high-flow standard device changes in a quadratic relationship with time; the rate of liquid level drop in the water tank and the rate of change of liquid flow in the test pipe with time For constant value. It is possible to use the above-mentioned features to calibrate a large-diameter flow meter using a variable head high-flow standard device. This article explores the methods used, and discusses some of the other features of the variable head high flow standard device.