液态金属局部流速测量技术对比研究

Comparison Research on Local Velocity Measurement Techniques for Liquid Metal

流场分布会影响能源系统关键设备内的流量、温度、氧浓度及应力分布,获取准确流场分布可提升结构设计能力及系统运行的可靠性。为选择先进核能系统金属冷却反应堆内合适的液态金属流场测量方式,分析适用于液态金属的局部流速测量技术,对比不同测量技术的研究进展及优劣。结果表明,当前尚未有适用于工程的成熟商业化金属流场测量仪器,介入式方法中,皮托管、电磁探针及电涡流探针的技术成熟度较高;非介入式方法中,超声多普勒技术成熟度最高,电磁感应成像应用前景较好。在此基础上,针对典型反应堆内运行环境推荐测量技术,其中电磁感应法因无需添加粒子、时间分辨率高而具有更广适用性。

The flow field affects the flow rate,temperature,oxygen concentration and stress distribution in key equipment of energy system.Obtaining accurate flow field distribution can help improve the structural design ability and system operation reliability.In order to select suitable methods for measuring flow field in liquid metal cooled reactor of advanced nuclear energy system,it is reviewed the suitable measurement techniques for local flow velocity of liquid metal.And the research progress as well as advantages and disadvantages of different measurement techniques are compared.It is found that there are no mature metal flow field measuring instruments for engineering application at present.As for the invasive method,the technology maturity of pitot tube,electromagnetic probe,and eddy current flowmeter probe is relatively high.As for the non-invasive method,the maturity of ultrasonic doppler velocimetry is the highest while the contactless inductive flow tomography is better in application prospects.On this basis,measurement techniques are recommended for typical operating situations in nuclear reactors,among which the contactless inductive method has wider applicability due to its nature of no added particles and high time resolution.