Cheng-Hao气体管道压降公式的普适性  

Universality of Cheng-Hao equation for calculation of pipe pressure drop

作　　者：程惠亭 郝文斌 卫兵兵 CHENG Hui-ting;HAO Wen-bin;WEI Bing-bing(Hualu Engineering and Technology Co.,Ltd.,Xi′an 710065,Shaanxi Province,China;School of Chemical Engineering and Technology,Xi′an Jiaotong University,Xi′an 710049,Shaanxi Province,China)

机构地区：[1]华陆工程科技有限责任公司,陕西西安710065 [2]西安交通大学化学工程与技术学院,陕西西安710049

出　　处：《化学工程》2022年第1期1-3,共3页Chemical Engineering(China)

摘　　要：指出气体管道压降计算中,传统的等温公式在压降较大时误差大的原因是平均密度假设。由于Cheng-Hao公式推导过程不引入该假设,因此,可以判断Cheng-Hao公式应比传统的等温公式更准确。为证明上述判断,利用等温公式、韦默思公式、潘汉德公式和Cheng-Hao公式同时计算了天然气长输管道的压降进行对比。结果表明:在管道长度10—250 km、压降在0—50%的范围内,Cheng-Hao公式和韦默思公式、潘汉德公式的计算结果吻合,说明Cheng-Hao公式有很好的压降范围的普适性,而传统的等温公式在压降达到40%以后误差急剧增加。此外,由于Cheng-Hao公式没有对管径、管道绝对粗糙度的限制,与韦默思公式、潘汉德公式相比,具有对各种管道规格的普适性,具有很好的应用前景。It was pointed out that the large error of the conventional isothermal equation result in calculating the large pipe pressure drop is due to the average density hypothesis.As no such assumption was adopted in the derivation of Cheng-Hao equation,suggesting that Cheng-Hao equation is more accurate than the conventional isothermal equation.To prove this,the pipe pressure drop of a long natural gas pipeline was calculated using isothermal equation,Weymouth equation,Panhandle equation,and Cheng-Hao equation to conduct a contrastive analysis.The calculation result of Cheng-Hao equation is consistent with those of Weymouth equation and Panhandle equation in the range of 10-250 km in pipeline length and 0-50%in pressure drop,which indicates good universality of Cheng-Hao equation.However,the error of isothermal equation result increases sharply when the pressure drop reaches 40%or above.Moreover,since there is no need to define the diameter and absolute roughness of pipeline,Cheng-Hao equation is universal to a variety of pipelines in comparison to Weymouth equation and Panhandle equation.In conclusion,Cheng-Hao equation has a good application prospects.

关 键 词：气体管道压降 等温公式 压降范围普适性 管道规格普适性 

分 类 号：O354[理学—流体力学]