1999•Chinese Journal of Nuclear Science and EngineeringRequires access
ANALYSIS ON TWO PHASE FLOW BEHAVIOR FOR NATURALCIRCULATION SYSTEM IN 5MW NUCLEAR HEATING REACTOR
B Oujie
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Abstract
The
experiment was carried out on a test loop HRTL 5 simulating the geometry and system design
of the 5MW Nuclear heating reactor,while the analysis was based on a one dimensional two
phase flow drift model with conservation equations for mass,steam,energy and
momentum.Clausius Clapeyron equation was used for the calculation of flashing front in the
riser.A set of ordinary differential equation,describing the behavior of two phase flow in the
natural circulation system,was derived through integration of the above conservation equations
in subcooled boiling region,bulk boiling region in the heated section and in the riser.The method
of time domain was used for the calculation.The results show that,firstly,subcooled boiling in
the heated section and void flashing in the riscr have signifiacnt influence on the distribution of
the void fraction,mass flow rate and stability of the system,espccially at lower
pressure;secondly,in a wide range of two phase flow conditions,only subcooled boiling occurs
in the heated section.The propagation behavior of flow oscillation was also studied.Calculated
results agree with experimental data well at the 5MW nuclear reactor conditions.