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旨在通过实验确定５ＭＷ核供热堆注硼系统所用渐扩喷管的水力特性。研究了在压力为０．７～１．５ＭＰａ的范围内，欠热度约为２０℃的水通过喉部直径为２～８ｍｍ、扩张角为６０°～１２０°的渐扩喷嘴的流动情况，结果表明：在一定条件下可在这种扩张角的渐扩喷嘴中形成临界流动现象。当出现临界流动时，通过渐扩喷嘴的临界流量大于孔板临界流量公式的计算值；当在喷嘴中没有形成临界流动时，通过这种渐扩喷嘴的流量可用孔板流量公式计算；流体通过扩张角为９０°的大扩张角渐扩喷嘴时的流动损失小于通过孔板时的损失；随扩张角的增大，相同条件下通过喷嘴的流量减小。
The aim is to experimentally determine the hydraulic characteristics of the divergent nozzle used in the 5 MW nuclear reactor heating system. In the range of 0.7 ~ 1.5 MPa, the flow of water with underheating of about 20 ℃ through a divergent nozzle with throat diameter of 2 ~ 8mm and extension angle of 60 ° ~ 120 ° was studied. It is shown that under certain conditions, a critical flow phenomenon can be formed in a widening nozzle with such divergence angle. When the critical flow occurs, the critical flow through the divergent nozzle is larger than the calculated critical flow rate of the orifice plate. When no critical flow is formed in the nozzle, the flow through this divergent nozzle can be calculated using the orifice flow equation; When the divergence angle is larger than 90 °, the flow loss is larger than that when it passes through the orifice. With the increase of the divergence angle, the flow through the nozzle decreases under the same conditions.