核电厂主蒸汽母管疏水多级孔板设计研究
Research on Design of Multistage Orifice Plate for Steam Master Tube in Nuclear Power Plant

为了缓解某核电厂常规岛主蒸汽疏水管道的振动严重、噪声大等现象，本文采用零维理论计算的方法对疏水用多级孔板进行了初步结构设计，并通过比例模化设计多级孔板试验件的形式，对试验件的性能展开了验证，从而指导了多级孔板的最终设计。得出如下结论：采用零维理论公式设计多级孔板时，误差较小，为±3%；在对试验件进行性能验证时，一级孔口处出现临界流现象，根据临界流量与设计流量的偏差对一级孔进行适当修正，最终误差在±1%。
In order to alleviate the serious vibration and loud noise of the conventional island main steam tube in a nuclear power plant, this paper has done the preliminary structural design of multistage orifice plate for hydrophobic use by using the method of zero-dimensional theoretical calculation, then through the scale modeling design multistage orifice plate test piece to test the performance of the validation, so as to guide the final design of the multistage orifice plate. The conclusions are as follows: When the zero-dimensional theoretical formula is used to design multistage orifice plate, the error is little (±3%). During the performance verification of the test piece, the critical flow phenomenon appears at the first-stage orifice. According to the deviation between the critical flow rate and the designed flow rate, the first-stage orifice is properly corrected, and the final error is ±1%.