Experimental Study on Distribution Characteristics of Flow Reversal in U-Tubes of Steam Generator under Natural Circulation
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摘要: 在自然循环工况下蒸汽发生器一次侧入口流量为0.4~0.7 kg/s的参数范围内,开展了蒸汽发生器U型传热管倒流特性实验。针对9种不同长度的U型传热管,分别设置9个倒流监测点,获得了倒流在不同长度U型管中的分布特性。基于传热管压降实测数据和守恒原理,获得了蒸汽发生器一次侧的倒流总流量以及倒流U型管的数目。结果表明,在本实验参数范围内,约有61%的U型管发生倒流,使传热管正向流通面积减小为原来的39%。倒流同时导致正流流量增加60%,与不发生倒流的情况相比,U型管平均流速增大4.2倍。Abstract: An experiment on flow reversal in U-tubes of steam generator(SG) has been made within the range of flow rate 0.4~0.7 kg/s under natural circulation. Nine pairs of monitoring points corresponding to nine groups of U-tubes with different length were installed to obtain the distribution characteristics of flow reversal. Based on the conservation laws and test data, total flow rate and the number of U-tubes of reverse flow in the primary side of SG were obtained. The results show that the flow reversal occurs in about 61% of U-tubes, which reduce the flow area of heat transfer tubes to 39%. Because of the flow reversal, the flow rate of the forward flow rise by 60%, and the speed of the flow in U-tubes increase to 4.2 times in contrast with that without flow reversal.
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Key words:
- Nature circulation /
- Steam generator /
- U-tube /
- Flow reversal
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