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本文介绍了应用二维频移激光测速系统对低温供热堆换热器流场的实验研究结果,测量了换热器模型三段流动进、出口截面内的二维平均速度和湍流度分布;用总压—速度法和静压—流量法分别测定了随雷诺数变化的阻力系数特性;以氩离子激光器作片光源对添加在流体中的示踪粒子得到的可视化照片清楚地显示了流场的平均流动特性,结果表明:管—壳式换热器的阻力系数随雷诺数的增大而趋于减小;总压—速度法同静压—流量法得到的结果差别很小;用可视化技术和激光测速得到的平均流动图形是一致的,为进一步改进换热器的结构提供了依据。
In this paper, the experimental results of two-dimensional frequency-shifted laser velocimetry system on the flow field of low-temperature heat reactor heat exchanger are introduced. The two-dimensional average velocity and turbulence distribution in the cross section of three-stage flow in the heat exchanger model are measured. The drag coefficient characteristics with the Reynolds number were measured by the total pressure-velocity method and the static pressure-flow method, respectively. The visualized images of the tracer particles added to the fluid using the argon ion laser as the sheet light source clearly showed that the flow field The results show that the drag coefficient of the tube-to-shell heat exchanger tends to decrease with the increase of Reynolds number. The difference between the total pressure-velocity method and the static pressure-flow method is very small. The average flow pattern obtained by the technique and laser velocimetry is consistent, providing a basis for further improving the structure of the heat exchanger.