孔板压降的内角影响机理分析及计算公式改进  

Mechanism analysis and calculation formula improvement of orifice plate pressure drop affected by inner angle

作　　者：李浩冉 刘磊[2] 张则亮[2] 白长青[1] LI Haoran;LIU Lei;ZHANG Zeliang;BAI Changqing(State Key Laboratory for Strength and Vibration of Mechanical Structures/Shaanxi Key Laboratory of Environment and Control for Flight Vehicle,Xi’an Jiaotong University,Xi’an 710049,China;PetroChina Dalian Petrochemical Company,Dalian 116031,China)

机构地区：[1]西安交通大学机械结构强度与振动国家重点实验室/陕西省先进飞行器服役环境与控制重点实验室,西安710049 [2]中国石油天然气股份有限公司大连石化分公司,大连116031

出　　处：《流体机械》2022年第11期54-60,共7页Fluid Machinery

基　　金：国家自然科学基金项目(12072247)。

摘　　要：针对现有的孔板压降计算公式不能定量表达孔板内角的影响的问题,建立孔板-管路系统的CFD仿真模型并对孔板压降进行计算分析,通过与已有试验数据对比,验证了所建立仿真模型的合理性并证实了孔板内角对压降有显著影响。在大量CFD数值仿真计算结果的基础上,阐述了孔板内角对其压降的影响机理,讨论了孔板内角、孔径比、孔板厚度与孔板压降相互影响的内在规律,提出了包含内角影响的新的孔板压降计算公式。对比分析表明本文所提出的改进计算公式与CFD仿真数据、文献试验结果吻合良好,误差基本在5%以下,在-45°~45°范围内,随着孔板内角值的增大,压降先减小后增大,最后趋于不变,存在压降最小值。For the problem that the existing formulas for the pressure drop of orifice plate cannot quantitatively express the influence of the inner angle of orifice plate, the CFD simulation model of orifice plate-pipeline system w as established for analyzing the pressure drop of orifice plate. By comparing the obtained results with the existing experimental data, the rationality of the simulation model was verified, and the significant influence of inner angle on pressure drop was validated. According to a large number of CFD numerical simulation results, the influence mechanism of inner angle on pressure drop was discussed. The internal law of interaction between inner angle, aperture ratio, thickness and pressure drop was described, and a new calculation formula for orifice plate pressure drop including inner angle effect was proposed. The comparison analysis shows that the improved formula is in good agreement with the CFD simulation and experiment results in the literature, and the errors are mostly below 5%. In the-45°~45°range, with the increase of the inner angle, the pressure drop decreases firstly and then increases, and finally tends to be constant. There is a minimum pressure drop.

关 键 词：孔板 内角 孔板压降 CFD仿真 数值计算 

分 类 号：TH12[机械工程—机械设计及理论] TK31[动力工程及工程热物理—热能工程]