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一、引言流体的密度会随着温度、压力和组分的变化发生改变。密度变化时,往往达不到准确测量流量的目的。在密度有较大变化的场合,为了准确测量流量,一般采取三种措施: 1.采用直接型质量流量计进行测量; 2.采用间接型质量流量计进行测量; 3.采用温度压力自动补偿。直接型质量流量计虽已有研究开发,但目前实际使用尚少。目前较多地采用温度、压力自动补偿的方式。但流体的组成变化导致密度改变时,就无法采用这种方式。或者温度,压力变化范围大,密度与温度、压力
I. INTRODUCTION Fluid density varies with temperature, pressure and composition. Density changes often fail to accurately measure the flow of the purpose. In the case of large changes in density, in order to accurately measure the flow, generally take three measures: 1. The use of direct type mass flow meter to measure; 2. The use of indirect mass flow meter to measure; 3. The use of automatic temperature and pressure compensation. Although the direct type mass flow meter has been research and development, but the actual use is still small. At present, more use of temperature, pressure automatic compensation method. However, changes in the composition of the fluid density changes, you can not use this approach. Or temperature, pressure range, density and temperature, pressure