Research into Cavitation Characteristics on RCP based on Section-constrained Blades
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To make sure that bubbles won’t block the impeller passage in the process of transient cavitation, section-constrained design is adopted in the hydraulic design of CAP1400 Reactor Coolant Pump’s(RCP’s) impeller blade, researching the cavitation bubble distribution at the suction side of blade in CAP1400 RCP under transient cavitation condition and the internal pressure pulsation law. To obtain the performance of the section-constrained impeller blade, the simulations are carried out by CFX software, then the cavitation bubble distribution at the suction side and the pulsation dynamics at each monitoring point under different extents of cavitation are obtained based on Reynolds-averaged N-S equation and SST k-ω equation. The results show that: the section-constrained blade has good constraint capacity on cavitation, and could enhance the passing ability of blade in some extent. The main causes of pressure pulsation inside a pump are the rotor-stator interaction, the separated flow at the round-like pump chamber, and the reflux inside the flow passage. The pressure pulsation inside the impeller and the guide vane is characterized with significant periodicity, which are both affected by rotor-stator interaction. And the impeller outlet and guide vane inlet are more susceptible to rotor-stator interaction. Studies on vapor-liquid two-phase flow and pressure pulsation inside the RCP’s impeller under transient cavitation are of great significance to the predication of the RCP’s dynamic characteristics after cavitation occurs, and to the safety and stable running of the RCP.
Key wordsRCP section-constrained blade transient cavitation numerical simulation experiment pressure pulsation
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This research was supported by the National Youth Natural Science Foundation of China (51509112); Natural science of Jiangsu Province(BK20171302); Key R&D Program Projects in Jiangsu Province (BE2016160, BE2017140, BE2018112); Key R&D Program Projects in Jiangxi Province (201703D121012) and National Key R&D Program Projects(2018YFB0606105).
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