Effect of Pumping Chamber Outlet Contraction Angle on Hydraulic Performance of Main Nuclear Reactor Pump
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摘要: 针对国内某百万千瓦核反应堆主泵的水力性能要求,完成主泵叶轮和导叶的设计;为研究出口收缩角对水力性能的影响,设计了13种压水室出口收缩角,采用三维软件Pro/E完成了三维造型;利用计算流体力学（CFD）软件Fluent进行定常与非定常三维数值模拟,得到内部流场特性及计算点的压力脉动情况,并对其进行分析。结果表明:收缩角对压水室与出口交接处的前后区域影响显著,收缩角在12°16°范围内,主泵效率均在70%以上,=15°时效率达最大值74.2%;在=15°且其他结构参数不变的情况下,随着流量的降低,主泵叶轮进口前和导叶出口处回流区域逐渐扩大;随着流量的增加,叶轮进口前回流区域逐渐向叶轮进口偏移;回流是引起压水室与出口交接处压力脉动的主要原因;偏离工况越大,压水室出口处的压力脉动波动越严重。Abstract: An RCP（reactor coolant pump） impeller and diffuser are designed to meet the hydraulic performance needs of the nuclear reactor coolant pump in a domestic 1000MW nuclear power plant.In order to study the effect of the pumping chamber outlet contraction angle,13 kinds of are designed and Pro/E is utilized for three-dimensional design,and CFD code Fluent is utilized for numerical simulation.Finally,the internal velocity vector and streamline of the RCP are obtained.It is revealed that the contraction angle has a significant effect on the connection area between pumping chamber and outlet.As is between 12° and 16°,and the efficiency of the RCP is above 70%.When is 15°,the efficiency reaches to the maximum 74.2%.When is 15° and other parameters unchanged,the reverse flow region of the impeller inlet and diffuser outlet becomes larger with the decrease of the flow rates.When the flow increases,the reverse region approaches closer to the impeller inlet.Reverse flow is the main cause of the pressure fluctuation of the connection area between pumping chamber and outlet,and the farther away the design point,the more serious the pressure fluctuation.
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