摩阻系数方程对比研究
Comparative Study on Friction Factor Equations
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- 引用格式:
-
苑伟民.摩阻系数方程对比研究[J].天然气与石油,2014,32(6):0.doi:
Yuan Weimin.Comparative Study on Friction Factor Equations[J].Natural Gas and Oil,2014,32(6):0.doi:
- DOI:
- 作者:
- 苑伟民
Yuan Weimin
- 作者单位:
- 中国石化天然气分公司广西液化天然气工程项目部
SINOPEC Gas Company, Guangxi Liquefied Natural Gas Engineering Project Department
- 关键词:
- 摩阻系数；Weymouth方程；Zegarola方程；Colebrook-White方程；GERG方程；对比分析
Friction factor; Weymouth equation; Zegarola equation; Colebrook-White formula; GERG equation; Contrastive analysis
- 摘要:
- 重点介绍了GERG（Groupe Européen de Recherches Gazières）公司提出的GERG摩阻系数方程，将该摩阻系数方程与Weymouth方程、Zegarola方程、经典的Colebrook-White摩阻系数方程应用实际运行数据计算，经过对比分析得出：Weymouth方程适用于管壁粗糙度k为20 ~30 μm的管道； Zegarola方程适用于从光滑管道粗糙管流态剧烈变化的摩阻系数计算；在进行当量粗糙度反算时，建议使用Colebrook-White方程，避免出现不合理的数值；当GERG摩阻系数方程中的可调节参数n=1时与Colebrook-White摩阻系数方程计算结果接近；当GERG摩阻系数方程中的可调节参数n≥9时，摩阻系数计算结果趋于稳定；n值反映了流态的变化，其数值的设定与反映流态的雷诺数一致时结果准确。
Friction factor estimation is a key component of pipeline system design. Introduced in detail is the new GERG friction factor equation proposed by GERG Company, conducted is contrastive analysis on GERG equation, Weymouth equation, Zegarola equation and classical Colebrook-White equation and these equations are applied to actual pipeline operation data calculation and such conclusions can be given that Weymouth equation can be applied to friction factor calculation of pipeline with k from 20μm to 30μm wall roughness, Zegarola equation can be applied to friction factor calculation of pipeline with drastic flow regime change. It is suggested that Colebrook- White equation is applied in back calculation of pipeline equivalent roughness in order to avoid unreasonable value and analysis results show that results obtained from GERG equation are close to those from Colebrook-White equation when the adjustable parameter n=1 and the result tends to be stable when n≥6. The value n in GERG equation reflects flow regime change and the result is accurate when the value is consistent with Reynolds number which reflects flow regime change.
