CFD流动调整器性能评价方法研究

Research on performance evaluation method for CFD-based flow conditioner

针对当前流动调整器性能评价依赖于具体管道系统,无法及时反馈、改进调整器结构等问题,提出一种基于CFD仿真技术的流动调整器性能评价方法。首先,建立流动调整器评价方法坐标系,并求解出各采样点坐标;然后,推导管道截面流速场充分发展性的判断依据,进而得出流动调整器整流效果评价指标;最后,采用CFD仿真技术对栅格式流动调整器进行验证实验。结果表明：提出的评价方法能快速、有效地对栅格式调整器下游流场充分发展性进行评判,有助于分析不同雷诺数下调整器性能的变化规律,并验证当5.84×10~6≤Re≤5.84×10~8,栅格式调整器下游不规则流场达到充分发展所需最少直管长度仅为不带调整器的0.5~0.6倍,对加速流动调整器设计、推动流体能源监测具有参考价值。

As evaluation of the performance of flow conditioner mostly depends on the specific pipeline system,feedback cannot be provided in a timely way for the purpose of structure design improvement. As such an CFD-based evaluation method for flow conditioner is suggested. First,the evaluation coordinates for flow conditioner is established and the coordinate values of each sampling point are solved out. Next, the basis for determining the development stage of velocity distribution of pipe cross-section is derived, by which the evaluation indexes of flow conditioner rectifier performance are obtained. At last,CFD simulation technology is applied for verifying grid format flow conditioner. The results showed that, the proposed evaluation method is effective in evaluating the grid format flow conditioner＇s performance quickly,helpful to analyze the function of flow conditioner＇s performance on Reynolds numbers. Where 5.84 ×10~6≤Re ≤5.84 ×10~8, the required straight pipe for velocity distribution downstream a grid format flow conditioner achieving full development is only 0.5-0.6 times by those without conditioner. It is of great significance to improve the flow conditioner design and to promote fluid energy monitoring.