摘要
随着超导技术的发展,高温超导电缆在电力输运中逐渐得到重视并进行了广泛的研究。由于波纹管具有良好的柔韧性和收缩性,在高温超导电缆中得到应用。波纹管内的流动压力损失参数是高温超导电缆低温系统重要的设计参数,因而研究波纹管内的流动特性具有重要的意义.对通径为6 mm,8 mm和10 mm的波纹管内液氮和氮气的流动特性进行了实验研究。液氮实验结果表明:液氮在波纹管内的流动具有波动性。在4000—40000的雷诺数范围内,测量了氮气的质量流量和压力损失,计算得到流动摩擦系数。分析表明。压力损失随雷诺数的增大而增大;波纹管的摩擦系数要高于光管,摩擦系数随雷诺数的增大而减小,摩擦系数随t/d的减小而减小。
With the development of the superconducting technology, high temperature superconducting （HTS） cable has come to practical application. The corrugated tube is used in the HTS power cable because of its flexibility and contractibility. However, the friction factor in corrugated tubes has not been well studied. Experiments were preformed to investigate the flow characteristics of liquid nitrogen and nitrogen gas in three corrugated tubes with the diameters of 6 mm, 8 mm and 10mm. It is found that the flow of liquid nitrogen in corrugated tubes displays oscillatory characteristic. The friction factors of nitrogen gas are compared with the conventional correlations over Reynolds numbers of 4000-40000. The friction factors of the corrugated tubes are higher than those of the smooth tubes. The corrugation geometries have big influences on the flow. The friction factor decreases with the decrease of t/d.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2008年第10期1725-1727,共3页
Journal of Engineering Thermophysics
基金
全国优秀博士论文作者专项基金(No.200236)
上海市科技攻关项目(No.055211003)
关键词
波纹管
湍流
压力损失
摩擦系数
corrugated tube
turbulent flow
pressure drop
friction factor
