摘要
螺旋波纹管尺寸参数与流体在其内部的压损之间的关系尚未明确,针对超导电缆用的Φ40 mm以上的大尺寸波纹管也缺乏相应的试验数据。本文搭建了大尺寸波纹管流动特性试验平台,并参照已有的超导电缆结构,对标称外径分别为Φ90 mm和Φ60 mm、尺寸规格不同的四个空芯螺旋波纹管样品进行水介质的流动特性试验研究,从试验上得到了不同流量下的压损数据。结果表明,波纹管内压损随流速的增大呈接近于平方的关系增大。在流速相同情况下,外径规格相同的样品,波深越深,压损值越大;波深相同的样品,外径越小压损越大。利用上述试验数据,推导出每个样品摩擦系数f与雷诺数Re的关系式。关系式计算值与实验值最大偏差值为16.77%,可在一定误差范围内对摩擦系数f进行估算。
Currently,the relationship between the size parameters and the pressure loss is still remained unknown.For large-sized corrugated pipe used in HTS cable with a diameter of overΦ40 mm,the corresponding experimental data is needed to be complemented.Therefore,a flow characteristic test platform for large-sized corrugated pipes was built.Refers to the existing superconducting cable structure,four hollow spiral corrugated pipe samples with different specifications were chosen to do experi⁃mental research on the flow characteristics with water medium.Each sample had nominal outer diameter ofΦ90 mm orΦ60 mm.The pressure loss data under different flow rates were obtained from the experiments.The results indicate that the pressure loss increases in a nearly square relationship with the increase of flow velocity.Under the same flow rate and the same outer diam⁃eter,the deeper the wave depth,the larger the pressure loss.Under the same flow rate and the same wave depth,the smaller the outer diameter,the larger the pressure loss.Using the experimental data,the relational expression between the friction coefficient f and the Reynolds number Re for each sample has been derived.The maximum deviation between the calculated value and the experimental value is 16.77%.The relational expressions can estimate the friction coefficient f within a reasonable error range.
作者
黄华
焦婷
黄逸佳
苏磊
Huang Hua;Jiao Ting;Huang Yijia;Su Lei(State Grid Shanghai Municipal Electric Power Company,Shanghai 200122,China;State Grid Electric Power Research Institute,Shanghai 200437,China;Shanghai International Superconductor Technology Co.Ltd,Shanghai 200444,China)
出处
《低温与超导》
CAS
北大核心
2024年第2期40-47,共8页
Cryogenics and Superconductivity
基金
国家电网有限公司科技项目(520940220029)资助。
关键词
超导电缆
螺旋波纹管
流动特性
压力损失
HTS cable
Corrugated pipes
Flow characteristics
Pressure drop
