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Flashing in riser and its effect on flow stability in natural circulation system

Technical Report:

Abstract

The experimental investigation was performed in the full scale thermo-hydraulic simulation test loop (HRTL-5) for the 5 MW-Heating Reactor at Institute of Nuclear Energy Technology, Tsinghua University. Under different pressures the flashing in riser of natural circulation system and its effect on flow stability were studied by the method of visual observation in synchronism with data recording. The results show that the lower the system pressure, the more obvious the flashing in the riser, and the stronger the effect on flow stability in the natural circulation system. Under very low pressure even if subcooling at the exit of heated test section is relatively higher, the flashing riser will appears due to gradual energy accumulation by strong thermodynamic non-equilibrium process. Consequently, a long period flow oscillation is stimulated in the system, and the time of period can be up to 40 s. When the system pressure reaches to 1.5 MPa, the flashing in riser is vanished. Based on these experiments, the mechanism of flashing in riser and the flow instability stimulated by the flashing are basically explained.
Authors:
Xinxin, Wu; Shaorong, Wu; Shengyao, Jiang; Lei, Zhou; Yunxian, Tong; Youjie, Zhang; Bing, Han [1] 
  1. Inst. of Nucl. Energy Technology, Tsinghua Univ., Beijing (China)
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
CNIC-00522; TSHUNE-0022.
Reference Number:
SCA: 220200; PA: AIX-24:007064; SN: 93000931931
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; NATURAL CONVECTION; STABILITY; REACTOR COOLING SYSTEMS; EVAPORATION; BENCH-SCALE EXPERIMENTS; EXPERIMENTAL DATA; PRESSURE DEPENDENCE; PROCESS HEAT REACTORS; SIMULATION; STEADY-STATE CONDITIONS; THERMODYNAMICS; TWO-PHASE FLOW; VOID FRACTION; 220200; COMPONENTS AND ACCESSORIES
OSTI ID:
10118969
Research Organizations:
China Nuclear Information Centre, Beijing, BJ (China)
Country of Origin:
China
Language:
Chinese
Other Identifying Numbers:
Other: ON: DE93612268; ISBN 7-5022-0524-1; TRN: CN9201800007064
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[11] p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Xinxin, Wu, Shaorong, Wu, Shengyao, Jiang, Lei, Zhou, Yunxian, Tong, Youjie, Zhang, and Bing, Han. Flashing in riser and its effect on flow stability in natural circulation system. China: N. p., 1991. Web.
Xinxin, Wu, Shaorong, Wu, Shengyao, Jiang, Lei, Zhou, Yunxian, Tong, Youjie, Zhang, & Bing, Han. Flashing in riser and its effect on flow stability in natural circulation system. China.
Xinxin, Wu, Shaorong, Wu, Shengyao, Jiang, Lei, Zhou, Yunxian, Tong, Youjie, Zhang, and Bing, Han. 1991. "Flashing in riser and its effect on flow stability in natural circulation system." China.
@misc{etde_10118969,
title = {Flashing in riser and its effect on flow stability in natural circulation system}
author = {Xinxin, Wu, Shaorong, Wu, Shengyao, Jiang, Lei, Zhou, Yunxian, Tong, Youjie, Zhang, and Bing, Han}
abstractNote = {The experimental investigation was performed in the full scale thermo-hydraulic simulation test loop (HRTL-5) for the 5 MW-Heating Reactor at Institute of Nuclear Energy Technology, Tsinghua University. Under different pressures the flashing in riser of natural circulation system and its effect on flow stability were studied by the method of visual observation in synchronism with data recording. The results show that the lower the system pressure, the more obvious the flashing in the riser, and the stronger the effect on flow stability in the natural circulation system. Under very low pressure even if subcooling at the exit of heated test section is relatively higher, the flashing riser will appears due to gradual energy accumulation by strong thermodynamic non-equilibrium process. Consequently, a long period flow oscillation is stimulated in the system, and the time of period can be up to 40 s. When the system pressure reaches to 1.5 MPa, the flashing in riser is vanished. Based on these experiments, the mechanism of flashing in riser and the flow instability stimulated by the flashing are basically explained.}
place = {China}
year = {1991}
month = {Sep}
}