基于CFD的气体超声流量计组合式整流器的研究

J Shanghai Jiaotong Univ Sci››2023,Vol. 28››Issue (5): 611-620.doi:10.1007/s12204-021-2378-1

基于CFD的气体超声流量计组合式整流器的研究

袁亚琦¹, 李世阳¹, 郑佳¹, 李明睿²

（1.开云网页登录仪器科学与工程系，上海200240; 2. 中国船舶重工集团公司第726研究所，上海201108）

接受日期:2020-11-26出版日期:2023-10-20发布日期:2023-10-20

CFD-Aided Investigation of Combined Flow Conditioners for Gas Ultrasonic Flow Meter

YUAN Yaqi¹(袁亚琦)，LI Shiyang^l*(李世阳)，ZHENG Jia¹(郑佳),LI Mingrui²(李明睿)

(1. Department of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. 726th Research Institute of China Shipbuilding Industry Corporation, Shanghai 201108, China)

Accepted:2020-11-26Online:2023-10-20Published:2023-10-20

摘要/Abstract

摘要：稳定、均匀的气体流场是实现气体超声流量计精确测量的关键。为了减小流场畸变，通常使用整流器。然而，传统的单一整流器只能部分改善流场分布。在复杂的管道条件下，流场畸变仍会严重影响超声波流量计时差的测量精度。为了进一步改善流场分布，本文研究了一种组合式整流器。该整流器由扇形截面部分、湍流混合腔和蜂窝状截面部分组成。通过计算流体力学计算流体动力学（CFD）仿真方法研究了DN50流量计风扇叶片角度和空腔长度对其流场的影响。仿真结果表明：与单一整流器相比，组合式整流器具有更好的性能，能有效减少涡流和湍流、提供更稳定和更好重复性的速度曲线。实验也验证了该组合式整流器的有效性。使用组合式整流器的流量计重复性小于0.2%，在相同条件下优于单一整流器。这项工作对气体超声流量计的精确测量，特别是对复杂管道条件下的测量具有重要意义。

关键词:计算流体动力学，气流整流器，气体超声流量计，涡旋，湍流

Abstract:Stable and fully developed gas flow field is crucial for realizing accurate measurement of gas ultrasonic flow meter. To reduce the flow field distortion, a flow conditioner is usually used. However, the traditional monotype flow conditioner can only improve the flow field distribution partly. The measurement accuracy of the transit time ultrasonic flow meter is still affected because of its serious flow field distortion in the complex pipeline conditions. In this paper, to further improve the flow field distribution, a combined conditioner is investigated. The combined flow conditioner is composed of fan-shaped section, turbulent mixing cavity, and honeycomb-shaped section. The effects of fan blade angle and cavity length on the flow field of the DN50 flow meter are studied using computational fluid dynamics (CFD) simulation. Simulation results indicate that compared with the monotype conditioner, the combined conditioner has better performance on effectively reducing the swirl and turbulence and providing more stable and repetitive velocity profiles. Experiments also validate the effectiveness of the combined conditioner. The flow meter with the combined conditioner has better repeatability of less than 0.2%, which is better than those of the monotype conditioners under the same conditions. This work is very useful for accurate measurement of gas ultrasonic flow meter, especially for the complex pipeline conditions.

Key words:computational fluid dynamics (CFD), flow conditioners, gas ultrasonic flow meter, swirl, turbulence

中图分类号:

TH814

袁亚琦1, 李世阳1 , 郑佳1, 李明睿2. 基于CFD的气体超声流量计组合式整流器的研究[J]. J Shanghai Jiaotong Univ Sci, 2023, 28(5): 611-620.

YUAN Yaqi1(袁亚琦)，LI Shiyangl*(李世阳)，ZHENG Jia1(郑佳),LI Mingrui2(李明睿). CFD-Aided Investigation of Combined Flow Conditioners for Gas Ultrasonic Flow Meter[J]. J Shanghai Jiaotong Univ Sci, 2023, 28(5): 611-620.

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