专用堆型对应的核主泵正反转流动数值模拟
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摘要
为了研究核主泵在定转速工况下的正反转特性,采用相似换算法,基于SST k-ω湍流模型与块结构化网格,对缩比系数为0.5的核主泵模型泵进行数值模拟.定义流量从泵进口流向出口为"+",反之为"-".在正转工况下分别对-0.8Qd到+2.0Qd流量范围内的16个工况点进行计算、反转工况下对-1.4Qd到+1.0Qd流量范围内的14个工况点进行计算,得到其全特性曲线.计算结果表明:在相同流量工况下,核主泵正转时的扬程与转矩总是高于反转时的扬程与转矩,叶轮扬程与泵扬程存在不同的变化趋势;在正转工况下,在-0.1Qd到+0.4Qd流量范围内,叶轮扬程曲线呈现反"N"型变化趋势;在反转工况下,在-0.4Qd到+0.1Qd流量范围内,叶轮扬程曲线呈一个明显的"V"型变化趋势;叶轮出口处产生二次流回流现象,这是正转小流量工况下叶轮扬程降低的主要原因,而叶轮与导叶之间过渡段区域内的环形高速带和叶轮流道内的大尺度涡是反转小流量工况下叶轮扬程降低的主要原因.
To identify the characteristics of reactor coolant pump( RCP) under positive and negative rotational speeds,numerical simulations of the flow in the model coolant pump scaled down from the real pump with 0.5 scaling factor based on the pump affinity laws were carried out by using the SST k-ω turbulence model and structured-mesh. The flow rate was defined as "+"when the fluid flows into the pump from the inlet,otherwise,it was defined as "-". The complete characteristic curves were predicted respectively with 16 operating points in the flow range of-0.8 Qd-+2.0 Qdunder positive rotational speed,and 14 operating conditions in the flow range of-1.4 Qd-+1.0 Qdunder negative rotational speed. The results show that at the same flow rate,the head and torque of the RCP under positive rotational speed are always higher than that under negative rotational speed. The impeller head and pump head have different variation trends. The impeller head curve is in upside-down "N"shape as the flow rate in the range of-0.1 Qd-+0.4 Qdunder positive rotational speed,but it is in "V"shape when the flow rate is in the range of-0.4 Qd-+0.1 Qdunder negative rotational speed. The internal flow results show that there is a secondary flow phenomenon in the impeller outlet. This flow pattern is mainly responsible for the drop in the impeller head under low flow rate conditions under positive rotational speed. The large-scale vortices in the impeller and the high-velocity region between the impeller and the radial diffuser are the main reason for the drop in the impeller head curve with negative rotational speed under low flow rate conditions.
To identify the characteristics of reactor coolant pump( RCP) under positive and negative rotational speeds,numerical simulations of the flow in the model coolant pump scaled down from the real pump with 0.5 scaling factor based on the pump affinity laws were carried out by using the SST k-ω turbulence model and structured-mesh. The flow rate was defined as "+"when the fluid flows into the pump from the inlet,otherwise,it was defined as "-". The complete characteristic curves were predicted respectively with 16 operating points in the flow range of-0.8 Qd-+2.0 Qdunder positive rotational speed,and 14 operating conditions in the flow range of-1.4 Qd-+1.0 Qdunder negative rotational speed. The results show that at the same flow rate,the head and torque of the RCP under positive rotational speed are always higher than that under negative rotational speed. The impeller head and pump head have different variation trends. The impeller head curve is in upside-down "N"shape as the flow rate in the range of-0.1 Qd-+0.4 Qdunder positive rotational speed,but it is in "V"shape when the flow rate is in the range of-0.4 Qd-+0.1 Qdunder negative rotational speed. The internal flow results show that there is a secondary flow phenomenon in the impeller outlet. This flow pattern is mainly responsible for the drop in the impeller head under low flow rate conditions under positive rotational speed. The large-scale vortices in the impeller and the high-velocity region between the impeller and the radial diffuser are the main reason for the drop in the impeller head curve with negative rotational speed under low flow rate conditions.
引文
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[3]秦杰.核主泵过流部件水力设计与内部流场数值模拟[D].大连:大连理工大学,2010.
[4]王俊,张永超,王达,等.混流式核主泵内部复杂流动结构分析[J].流体机械,2017,45(10):58-63.WANG Jun, ZHANG Yongchao, WANG Da, et al.Analysis of internal flow structures in a mixed flow nuclear main pump[J]. Fluid machinery,2017,45(10):58-63.(in Chinese)
[5]杜媛英,刘琳,刘刚,等.非定常大涡模拟下混流泵叶轮的轴向力研究[J].流体机械,2016,44(11):15-19.DU Yuanying,LIU Lin,LIU Gang,et al. Study of axial force on impeller of mixed-flow pump by unsteady large eddy simulation[J]. Fluid machinery,2016,44(11):15-19.(in Chinese)
[6]王鹏,袁寿其,王秀礼,等.大流量工况下核主泵内部不稳定特性分析[J].振动与冲击,2015,34(9):196-201.WANG Peng, YUAN Shouqi, WANG Xiuli, et al.Analysis on internal unsteady characteristics of nuclear main pump under large flow condition[J]. Journal of vibration and shock,2015,34(9):196-201.(in Chinese)
[7]付强,龙云,朱荣生,等.失水事故工况下主泵全特性数值分析[J].核动力工程,2014(2):121-126.FU Qiang,LONG Yun,ZHU Rongsheng,et al. Numerical analysis on complete characteristics of LOCA reactor coolant pump[J]. Nuclear power engineering,2014(2):121-126.(in Chinese)
[8]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011.
[9]钱卫东. AP 1400核主泵的四象限特性试验研究[J].水泵技术,2015(5):7-12.QIAN Weidong. Experimental study on four quadrant characteristics of AP 1400 nuclear main pump[J].Pump technology,2015(5):7-12.(in Chinese)
[10] ZHOU J Z. Experimental study on characteristic curves of restoring forces of populus alba var. pyramidalis[J].Forestry studies in China,2011,13(4):315-320.
[11] KNIERIM C,BAUMGARTEN S,FRITZ J,et al. Design process for an advanced reactor coolant pump for a 1 400MW nuclear power plant[C]//Proceedings of the ASME2005 Fluids Engineering Division Summer Meeting,2005:1363-1369.
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