Study on Calculation Method of Crack Leakage Rate of Valve Sealing Surface
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摘要: 在核动力系统的运行过程中，由于热载荷和疲劳载荷的作用，阀门密封面可能产生裂纹，并导致泄漏发生，甚至出现更严重的后果。因此研究阀门密封面裂纹的泄漏率将提高反应堆的安全性。本文以Henry-Fauske临界流动模型为基础，同时考虑泄漏过程中的阻力，形成一套用于计算不同工况（高温水及饱和蒸汽）下阀门密封面裂纹泄漏率的计算方法。最后根据实际工况搭建裂纹泄漏率测量实验平台，并将实验测量的泄漏率与理论模型计算的泄漏率进行比较来验证本文提出的泄漏率计算方法的准确性。经过实验与理论的比较，本文提出的裂纹泄漏率计算方法能够较为准确地预测阀门密封面裂纹泄漏率，有较好的实际应用价值。Abstract: During the operation of nuclear power system, cracks may occur on the valve sealing surface due to thermal load and fatigue load, which may lead to leakage and even more serious consequences. Therefore, studying the leakage rate of cracks on the valve sealing surface will improve the safety of the reactor. Based on the Henry-Fauske critical flow calculation model and considering the resistance during the leakage process, a set of calculation methods for calculating the crack leakage rate of the valve sealing surface under different operating conditions (high temperature water and saturated steam) is developed in this paper. Finally, the experimental platform of crack leakage rate measurement is built according to the actual operating conditions, and the leakage rate measured by experiment is compared with the leakage rate calculated by the theoretical model to verify the accuracy of the leakage rate calculation method proposed in this paper. Through the comparison of experiment and theory, the calculation method of crack leakage rate proposed in this paper can predict the crack leakage rate of valve sealing surface more accurately, and has good practical application value.
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Key words:
- Nuclear power system /
- Valve sealing surface /
- Crack /
- Leakage rate /
- Calculation method /
- Leakage rate measurement
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图 2 泄漏率测量实验装置总图
Figure 2. General Drawing of Leakage Rate Measurement Experimental Device
图 3 实验段及冷凝段简图
Figure 3. Schematic Diagram of Experimental Section and Condensing Section
图 5 高温水条件下阀门密封面裂纹泄漏率实验值与计算值对比
Figure 5. Comparison of Experimental and Calculated Crack Leakage Rates of Valve Sealing Surface Under High Temperature Water Condition
图 6 饱和蒸汽条件下阀门密封面裂纹泄漏率实验值与计算值对比
Figure 6. Comparison of Experimental and Calculated Crack Leakage Rates of Valve Sealing Surface Under Saturated Steam Condition
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