준밀폐형 2상자연순환 회로 내에서의 유동 진동에 관한 실험적 연구Experimental Investigation of Flow Oscillations in a Semi-closed Two-phase Natural Circulation Loop

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In the present experimental study, flow behavior in a semi-closed two-phase natural circulation loop was examined. Water was used as the working fluid. Heat flux, heater-inlet subcooling, and flow restrictions at the heater-inlet and at the expansion-tank-line were taken as the controlling parameters. Six circulation modes were identified by changing heat flux and inlet subcooling conditions ; single-phase continuous circulation, periodic circulation (A), two-phase continuous circulation, and periodic circulations (B), (C), and (D). Among these, the single-phase and two[phase continuous-circulation modes exhibit no significant oscillations and are considered to be stable. Periodic circulation (A) is characterized by the large amplitude two-phase flow oscillations with the temporal single-phase circulation between them, while periodic circulation (B) featured by the flow oscillations with continuous boiling inside the heater section. Periodic circulation (C) appears to be the manometric oscillation with continuous boiling. Periodic circulation (D) has the longer period than periodic circulation (B) and a substantial amount of liquid flows back and forth through the expansion-tank-line periodically ; this mode is considered the pressure drop oscillation. Parametric study shows that the increases of the inlet- and expansion-tank-line- restrictions and the decrease of inlet subcooling broaden the range of the stale two-phase(continuous circulation) mode.
Publisher
대한기계학회
Issue Date
1998-12
Language
Korean
Citation

대한기계학회논문집 B, v.22, no.12, pp.1763 - 1773

ISSN
1226-4881
URI
http://hdl.handle.net/10203/15262
Appears in Collection
ME-Journal Papers(저널논문)
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