管长对UTSG倒流管空间分布的影响分析

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Effect of U-Tube Length on Space Distribution of UTSG Reverse Flow in Tubes

Department of Nuclear Energy Science and Engineering。Naval University of Engineering, Wuhan, 430033, China

摘要: 自然循环条件下,自然循环U型管蒸汽发生器(UTSG)并联倒U型传热管内存在非均匀流动,部分传热管出现倒流;现有研究对倒流管的空间分布存在不同认识。通过建立一维、稳态条件下的传热管内流动换热模型,发现传热管管长对并联倒U型管间的流量压降对比关系产生影响,进而对倒流管的空间分布产生影响。传热管管长较小的UTSG,短管将先于长管发生流量漂移;反之,长管将先于短管发生流量漂移。采用最佳评估程序RELAP5/MOD3.3对研究结果进行了验证。
- U型管蒸汽发生器 /
- 倒流 /
- 空间分布
Abstract: For natural circulation,it is shown that parallel flow in the tubes of inverted U-tube steam generators can be non-uniform.And reverse flow occurs in some tubes.Existing studies on the space distribution of reverse flow tubes are dissident.A flow model of one-dimensional steady state is established.Analysis shows that the length will change the relationship of flow characteristics between tubes.And the space distribution of reverse flow tube differs further.When the U-tube length of UTSG is small enough,flow excursion will occur earlier in shorter tube than longer tube,and vise versa.And the analysis is validated by best estimate code RELAP5/MOD3.3.
- UTSG /
- Reverse flow /
- Space distribution