冷压缩机用多级连接管路的数值模拟
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摘要
多级串联冷压缩机系统是大型超流氦低温系统关键部件,其每一级冷压缩机的性能同时受前后管网流动影响较大。为探究管路特性影响,结合实际系统中冷压缩机间低温连接管路的结构,建立了流-热耦合分析仿真模型,重点研究了管路内粗糙度、旋度流动特征及波纹管结构特征对气体流动特性的影响。结果表明管路粗糙度和流体旋度的变化会显著引起管路内总压的损失,同时分析得出波纹管的波节数和导流筒结构对管路内氦气流动的影响规律。
The multi-stages cold compressor system is the key component of the large-scale superfluid helium cryogenic system and its performance is greatly affected by the flow condition inside the pipe networks. To explore the influence of pipeline characteristics, a flow-thermal coupling analysis simulation model is established, which combines the structure of the low-temperature connecting pipe between the cold compressors in the actual system. The effects of pipeline roughness, swirl flow characteristics and bellows structural on the flow characteristics are studied in detail. The results show that the variation of pipeline roughness and fluid rotation will significantly affect the loss of total pressure in the pipeline. Also, the effect of the node number and the guide cylinder structure of the metallic bellows that impact the effect on the helium flow characteristics are analyzed and deduced.
The multi-stages cold compressor system is the key component of the large-scale superfluid helium cryogenic system and its performance is greatly affected by the flow condition inside the pipe networks. To explore the influence of pipeline characteristics, a flow-thermal coupling analysis simulation model is established, which combines the structure of the low-temperature connecting pipe between the cold compressors in the actual system. The effects of pipeline roughness, swirl flow characteristics and bellows structural on the flow characteristics are studied in detail. The results show that the variation of pipeline roughness and fluid rotation will significantly affect the loss of total pressure in the pipeline. Also, the effect of the node number and the guide cylinder structure of the metallic bellows that impact the effect on the helium flow characteristics are analyzed and deduced.
引文
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2 Maofei G,Yuntao S,Anyi C,et al.Determination of critical parameters in the EAST subcooled helium system[J].Fusion Engineering and Design,2018,131:84-89.
3张磊,张卓,李少鹏.大型超流氦低温系统中冷压缩机叶轮的设计和优化[J].低温工程,2018(5):59-64.Zhang Lei,Zhang Zhuo,Li Shaopeng.Design and optimization of cold compressor impeller in large superfluid helium cryogenic system[J].Cryogenics,2018(5):59-64.
4魏操兵,伍继浩,张舒月,等.冷压缩机用局部中空薄壁转子动态特性分析[J].科学技术与工程,2018,18(15):99-104.Wei Caobing,Wu Jihao,Zhang Shuyue,et al.The dynamic characteristics analysis of the local hollow thin-walled rotor applied in cold compressor[J].Science Technology and Engineering,2018,18(15):99-104.
5 Kameno H,Kubo A,Takahata R,et al.Application of active magnetic bearings for helium-cold compressor[J].KOYO Engineering Journal,2000,158:16-20.
6 Millet F,Claudet S,Ferlin G.Performance assessment of 35 cold hydrodynamic compressors for the 1.8 K refrigeration units of the LHC[C].AIP Conference Proceedings,2006,823(1):1837-1844.
7 Kundig A,Asakura H.Control consideration of multi stage cold compression system in large helium refrigeration plants[J].Proceedings of ICEC19 Grenoble,France,2002:681-686.
8何家声.液氢管路绝热设计与效果分析[J].低温工程,2005(1):17-20.He Jiasheng.Insu Iation design and effect analysis of liquid hydrogen line[J].Cryogenics,2005(1):17-20.
9肖军,舒信伟,高闯,等.考虑进气预旋的离心压缩机流动的数值分析[J].动力工程学报,2008,28(3):400-403.Xiao Jun,Gu Changang,Gao Chuang,et al.Numerical analysis of the flow in centrifugal compressor in consideration of inlet pre-whirl[J].Journal of Power Engineering,2008,28(3):400-403.