板状燃料组件窄缝流道流速分布实验研究

Experimental Research on Velocity Distribution in Narrow Slots of Plane Type Reactor Fuel

实验研究了平行窄缝流道板状燃料组件的流速分布。实验以无离子水作流动介质,在常压及不同Re条件下进行。实验结果表明:在不同Re条件下,横向单通道流速分布呈中间流速高、边缘流速陡减的梯形分布,符合常规流道流速分布特点;纵向平行多通道间的流型呈中间流速低、边缘流速高的凹型分布,这种凹型分布是由入口结构件造成的,对反应堆堆芯流量的均匀分配不利。

The experimental research on velocity distribution in multiple parallel narrow channels formed by fuel plane of assembly is carried out under various Re and the water without ions as fluid in testing loop. The experimental results show that under various Re within a channel the velocity in the middle area is high and the velocity in the edge of channel decreases rapidly to zero, and the velocity is symmetrically distributed along the centra line, thus the velocity distribution within a channel is like a trapezium. While in parallel channels the velocity of the middle channel is low and the velocity of the channel close to the edge is high, it is supposed to be caused by the inlet structure of channels,this concave distribution is a disadvantage to the even distribution of reactor flux.