Effect of heaving strength and cycle on natural circulation flow characteristics

被引：0

作者：

Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing ^{[1
]}

100084, China

机构：

[1] Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing

来源：

Harbin Gongcheng Daxue Xuebao | / 4卷 / 448-451期

关键词：

Effect mechanism; Flow fluctuation; Heaving cycle; Heaving motion; Heaving strength; Natural circulation; Undercooling;

D O I：

10.3969/j.issn.1006-7043.201412060

中图分类号：

学科分类号：

摘要：

In order to investigate the effect of heaving motion on the flow characteristics of natural circulation, a calculation program was developed to study the influence of heaving strength and heaving cycle on the flow fluctuation of natural circulation, undercooling in the outlet of heating section and undercooling in the outlet of the secondary side of heat exchanger based on a natural circulation loop of 5MW experimental low temperature nuclear heating reactor (NHR). A mathematical model was established and the coordinate system was mounted on the experimental apparatus. The issue of natural circulation under heaving condition could be treated as a problem in non-inertial reference frame. Considering the effect of an additional force resulting from heaving motion on natural circulation, a time-dependent coefficient (1-ksin(ωdt)) was multiplied with gravity acceleration g. Calculation results indicated: higher level of heaving strength would lead to more serious fluctuation of flow and temperature; flow fluctuation exhibited an obvious nonlinear property and long-periodic heaving motion would result in saturation or even boiling. The analysis of the influence mechanism of heaving motion on natural circulation showed an alternating field composed of the additional force and gravity, forming the driving force of natural circulation in case of flow density contrast. ©, 2015, Editorial Board of Journal of HEU. All right reserved.

引用

页码：448 / 451

页数：3

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