摘要
对DN150管径的钢管内壁增加减阻涂层后,在流量为65 t/h,水温为20、25、30、35、40℃5种工况下进行了压降测试,得到87 m长有涂层管段的压降平均值为4.63 kPa,无涂层管段的压降平均值为9.63 kPa。根据实测压降推算得到,有涂层管段的当量绝对粗糙度约为0.01 mm,为CJJ 34—2010《城镇供热管网设计规范》规定的当量绝对粗糙度0.5 mm的1/50。和当量绝对粗糙度0.5 mm时的理论计算值相比,实验工况减阻涂层的减阻率达到42.22%。以DN1200大管径长输供热管道为例,在流量10000~16000 m^(3)/h,水温20、40℃工况下,计算得到有涂层管段的减阻率为32%~37%。
After adding drag-reducing coating to the inner wall of the steel pipe with DN150 pipe diameter,conducts the pressure drop test under five working conditions with flow rate of 65 t/h and water temperature of 20,25,30,35,40℃,obtains that the mean pressure drop on the 87 m pipe with inner drag-reducing coating is 4.63 kPa,and the mean pressure drop on the 87 m pipe without inner drag-reducing coating is 9.63 kPa.Based on the actual pressure drop calculation,the equivalent absolute roughness of the coated pipe section is about 0.01 mm,which is 1/50 of the equivalent absolute roughness of 0.5 mm specified in CJJ 34-2010 Code for design of urban heating pipe networks.Compared with the theoretical calculation value when the equivalent absolute roughness is 0.5 mm,the drag-reducing rate of the drag-reducing coating under the experimental conditions reaches 42.22%.Taking the long-distance heat supply pipeline with a large diameter of DN1200 as an example,when the flow rate is 10000 to 16000 m^(3)/h and the water temperature is 20,40℃,the drag-reducing rate of the coated pipe section is calculated to be 32%to 37%.
作者
苗庆伟
张欢
王淮
赵惠中
常娅娜
刘秀清
刘洋
Miao Qingwei;Zhang Huan;Wang Huai;Zhao Huizhong;Chang Yana;Liu Xiuqing;Liu Yang(Tianjin University,Tianjin,China;不详)
出处
《暖通空调》
2021年第11期72-76,共5页
Heating Ventilating & Air Conditioning
关键词
供热管道
减阻涂层
当量绝对粗糙度
减阻率
实验研究
heating pipeline
drag-reducing coating
equivalent absolute roughness
drag-reducing rate
experimental research
