Experimental study on two-phase flow instability for application of PCHE-type steam generator in SMR = 소형모듈원전 내 인쇄기판형 증기발생기의 적용을 위한 이상 유동 불안정성에 대한 실험적 연구

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The objective of this study is to verify the feasibility and applicability of the PCHE-type steam generator. In order to carry out this study, we constructed a new experimental facility in KAIST and conducted boiling experiments under high pressure conditions. We have experimentally confirmed what happens in the heat exchanger consisting of thousands of mini-channels. The pressure drop characteristic curves of the flow rates were obtained under different conditions of heater output, system pressure, inlet temperature, and inlet pressure drop, and the occurrence of flow instability was compared together. A physical model that well predicts the pressure drop characteristics inside the heat exchanger was evaluated and selected. Through the experiments to verify stable superheated steam generation of PCHE, its possibility to be used as a steam generator was confirmed. By analyzing the flow instability with dimensionless parameters, the boundary of density wave oscillation was predicted and the inlet pressure drop value which enables stable flow was obtained. Previous models were first compared with the experimental results, and then the Guido model was modified and developed to apply the steam generator that generates high-quality steam. The KAIST model offers a wider operating margin than the Guido model.
Advisors
No, Hee Cheonresearcher노희천researcher
Description
한국과학기술원 :원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2017.8,[vii, 102 p. :]

Keywords

PCHE▼aTwo-phase flow instability▼aSteam generator▼aDensity-wave oscillation▼aLedinegg instability; 인쇄기판형열교환기▼a이상유동불안정성▼a증기발생기▼a밀도파진동▼a레디넥 불안정성

URI
http://hdl.handle.net/10203/241959
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=718867&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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