棒束通道温度场可视化实验研究
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摘要
基于激光诱导荧光技术,对带定位格架棒束通道的温度场进行了可视化实验研究。采用折射率匹配技术,搭建可视化实验系统,提出适用于棒束通道温度场点对点标定的关系式,利用此关系式对定位格架下游温度场进行了重构。实验结果显示,采用激光诱导荧光技术可获得定位格架下游全场温度分布。分析了不同加热形式、流量和热流密度对温度分布的影响,并采用轴向流体温差和温度分布不均匀性定量评价了定位格架下游的搅混能力。在定位格架下游0~4 Dh范围内,搅混性能逐渐增大,在4 Dh后会随高度的增加逐渐减小。结果表明,激光诱导荧光技术可适用于棒束通道温度场的非介入式、全场测量,有助于对相应程序的验证和定位格架搅混性能的评价。
Laser induced fluorescence(LIF)technique was applied to investigate the temperature distribution in rod bundles with spacer grid.A visual experiment facility was designed using matching index of refraction(MIR)approach.The point-to-point calibration relations of temperature and light intensity applied to rod bundle were presented.Accordingly,temperature field was reconstructed with the calibration relations.The results show that temperature field of downstream of spacer grid can be obtained using LIF technique.The influences of different heating forms,flow rate and heat flux on temperature distribution were analyzed.Meanwhile,temperature difference on the same axial height and temperature non-uniformity were adopted to evaluate the mixingperformance in rod bundle.The mixing performance increases gradually on 0-4 Dhdownstream of spacer grid,and then decreases with the height.It is concluded that LIF technique is applicable to non-intrusive and full-field measurement in rod bundles,and it can be used as good provider for data base to validate CFD codes and evaluate the spacer grid performance.
Laser induced fluorescence(LIF)technique was applied to investigate the temperature distribution in rod bundles with spacer grid.A visual experiment facility was designed using matching index of refraction(MIR)approach.The point-to-point calibration relations of temperature and light intensity applied to rod bundle were presented.Accordingly,temperature field was reconstructed with the calibration relations.The results show that temperature field of downstream of spacer grid can be obtained using LIF technique.The influences of different heating forms,flow rate and heat flux on temperature distribution were analyzed.Meanwhile,temperature difference on the same axial height and temperature non-uniformity were adopted to evaluate the mixingperformance in rod bundle.The mixing performance increases gradually on 0-4 Dhdownstream of spacer grid,and then decreases with the height.It is concluded that LIF technique is applicable to non-intrusive and full-field measurement in rod bundles,and it can be used as good provider for data base to validate CFD codes and evaluate the spacer grid performance.
引文
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[15]陈畏葓,张虹,张凤林,等.先进燃料组件格架交混性能分析[J].核动力工程,2008,29(3):1-4.CHEN Weihong,ZHANG Hong,ZHANG Fenglin,et al.Mixing preformance analysis for advanced fuel assembly grid[J].Nuclear Power Engineering,2008,29(3):1-4(in Chinese).
[2]LIU C C,FERNG Y M,SHIH C K.CFD evaluation of turbulence models for flow simulation of the fuel rod bundle with a spacer assembly[J].Applied Thermal Engineering,2012,40(7):389-396.
[3]田瑞峰,毛晓辉,王小军.定位格架典型部件对5×5棒束通道内流场影响的数值研究[J].原子能科学技术,2009,43(1):41-45.TIAN Ruifeng,MAO Xiaohui,WANG Xiaojun.Numerical study on different effects on flow field in 5×5rod bundles brought by different parts of spacer grids[J].Atomic Energy Science and Technology,2009,43(1):41-45(in Chinese).
[4]晁嫣萌.定位格架对燃料组件流动传热影响的数值模拟研究[D].北京:北京交通大学,2015.
[5]LEE C M,CHOI Y D.Comparison of thermohydraulic performances of large scale vortex flow(LSVF)and small scale vortex flow(SSVF)mixing vanes in 17×17nuclear rod bundle[J].Nuclear Engineering and Design,2007,237(24):2 322-2 331.
[6]王海松,冷洁,刘绍强,等.不同搅混翼定位格架5×5棒束通道内流动与传热特性数值研究[J].热科学与技术,2017,16(3):187-192.WANG Haisong,LENG Jie,LIU Shaoqiang,et al.Numerical investigation of flow and heat transfer characteristics in 5×5rod bundles with difference spacer grids[J].Journal of Thermal Science and Technology,2017,16(3):187-192(in Chinese).
[7]OWEN F K.Simultaneous laser measurements of instantaneous velocity and concentration in turbulent mixing flows[C]∥Proceedings of the AGARD Conference of Non-intrusive Instrumentation in Fluid Flow Research(AGARD-CP-19).Washington:[s.n.],1976.
[8]张万里,付雪青.基于PLIF的混合气温度和浓度测量及其应用[J].中国安全生产科学技术,2014,10(9):61-66.ZHANG Wanli,FU Xueqing.PLIF-based temperature and concentration measurement of incylinder mixture and its application[J].Journal of Safety Science and Technology,2014,10(9):61-66(in Chinese).
[9]杜闰萍,刘喆,程易,等.平面激光诱导荧光技术用于快速液-液混合过程温度场测量[J].过程工程学报,2007,7(5):859-864.DU Runping,LIU Zhe,CHENG Yi,et al.Measurement of temperature field in a fast liquidliquid mixing process by PLIF[J].The Chinese Journal of Process Engineering,2007,7(5):859-864(in Chinese).
[10]NATRAJAN V K,CHRISTENSEN K T.Twocolor laser-induced fluorescent thermometry for microfluidic systems[J].Measurement Science&Technology,2009,20(1):15401.
[11]BRUCHHAUSEN M,GUILLARD F,LEMOINE F.Instantaneous measurement of twodimensional temperature distributions by means of two-color planar laser induced fluorescence(PLIF)[J].Experiments in Fluids,2005,38(1):123-131.
[12]赵婷杰,谭思超,王啸宇,等.双色激光诱导荧光法在矩形通道温度场测量中的应用[C]∥第十四届全国反应堆热工流体学术会议文集.北京:中国核学会核能动力分会反应堆热工流体专业委员会,2015.
[13]李少丹,林原胜,谭思超,等.双色平面激光诱导荧光法测温技术研究[J].核动力工程,2014,23(4):137-141.LI Shaodan,LIN Yuansheng,TAN Sichao,et al.Study on two-color planar laser induced fluorescence thermometry[J].Nuclear Power Engineering,2014,23(4):137-141(in Chinese).
[14]COPPETA J,ROGERS C.Dual emission laser induced fluorescence for direct planar scalar behavior measurements[J].Experiments in Fluids,1998,25(1):1-15.
[15]陈畏葓,张虹,张凤林,等.先进燃料组件格架交混性能分析[J].核动力工程,2008,29(3):1-4.CHEN Weihong,ZHANG Hong,ZHANG Fenglin,et al.Mixing preformance analysis for advanced fuel assembly grid[J].Nuclear Power Engineering,2008,29(3):1-4(in Chinese).