基于PIV技术流动调整器性能试验研究

Experimental Study on Performance of Flow Conditioners Based on PIV Measurements Technology

关键词:  流量计  流态畸变  流动调整器  PIV  流动分布

Key words:  Flowmeter  Flow distortion  Flow conditioner  PIV  Flow distribution

摘要:

管内流态畸变对压差式流量计的测量精度有较大影响。在流量计的上游安装流动调整器，可以达到改善甚至消除流态畸变、提高测量精度的目的。为了研究流动调整器的整流效果及性能，选取竖直双弯头（90o布置）和半开阀门（50%开度）两种涡发生器来产生流态畸变，采用PIV测速技术，对管束式流动调整器、AMCA调整器和Zanker流动调整器三种流动调整器的整流效果进行实验研究。研究结果表明，相较于无流动调整器情况，三种流动调整器均能明显起到改善流态畸变的作用。其中管束式流动调整器和AMCA调整器可以有效地消除径向速度波动和漩涡流动，而Zanker流动调整器消除速度不对称分布的能力最强，同时带来的压力损失也最大。

Abstract:

The flow distortion in tube has a great impact on the measurement accuracy of the differential pressure flowmeter. A flow conditioner, placed upstream of the flowmeter, can reduce or completely eliminate this flow distortion in practical applications and improve the measurement accuracy of the flowmeter significantly. In this paper,in order to research the rectification effect and performance of the flow conditioners, the performance of three flow conditioners, i.e. tube bundle flow conditioner, AMCA flow conditioner and Zanker flow conditioner, was experimentally studied by advanced PIV technology.Two vortex generators, i.e. 90° configurated double bends and 50% opening value, were selected to produce the flow distortion.The results showed that the flow distortion could be significantly reduced with flow conditioners installed.Tube bundle flow conditioner and AMCA flow conditioner had obvious effects on eliminating the radial velocity fluctuation and vortex flow. Meanwhile, Zanker flow conditioner was found to perform best on offsetting the asymmetrical velocity distribution, while the maximum pressure drop was caused simultaneously.