基于CFD的流动调整器优化设计

针对瓦斯抽采监控系统中气体流量计上游管道内气体流速分布不均匀问题,提出一种多组去心叶片交错分布流动调整器优化结构。以叶片组数和相邻两叶片组的交错角度为优化参数,建立4种调整器结构优化模型。利用CFD数值模拟技术分析不同雷诺数时各调整器下游的流场特性,对比调整器下游6个位置处流体的径向速度与充分发育流体的相差程度。结果表明,4组叶片交错布置11.25°时调整器整流效果相对较好,可将调整器下游所需直管长度缩短50%,为瓦斯流量测量减小空间成本、提高测量准确性提供理论参考。

Optimization Design of Flow Conditioner Based on CFD

In view that the gas flow rate distribution in the upstream pipeline of the gas flowmeter in the gas drainage monitoring system is uneven,an optimized structure of multiple groups of eliminating the central portion of vane staggered distribution flow conditioners was proposed.Four structural optimization models of the conditioner were established by taking the number of vane groups and the interlacing a certain angle of two adjacent vane groups were used as optimization parameter.CFD numerical simulation technology was used to analyze the flow field performance of the downstream of each conditioner under different Reynolds numbers,and the difference between the radial velocity of the fluid at the six positions downstream of the flow conditioner and the fully developed fluid was compared.The results show that the performance is relatively better of the conditioner when the four groups of vanes are staggered at 11.25°,in which downstream the length of the straight pipe required from the irregular flow field to the fully develop flow field is shortened by at least 50%,which provides a theoretical reference for gas flow measurement to reduce space cost and improve measurement accuracy.