端面磨损对U型槽动压机械密封性能的影响

以核主泵所用U型槽动压密封环为对象，研究了密封端面因介质中微粒所引起的磨损问题.结果表明：端面动压槽根部产生的初期磨损将造成刚度和泄漏率增加，且随着磨痕数量的增加，泄漏率呈线性增加；当磨痕贯穿密封坝而使U型槽根部与端面低压侧短路时，将会造成泄漏率的阶跃上升和刚度急剧下降.在实际使用的过程中，多个U型槽将会同时出现磨痕，当一处磨痕贯穿密封坝时，将造成大量介质泄漏，且磨痕越深，其泄漏率越大，最终导致密封失效.

Effect of Face Wear on Sealing Performance of U grooved Mechanical Seals

The effect of face abrasive wear by debris in sealed fluid on sealing performance was studied for U grooved mechanical seals typically used in a nuclear primary coolant pump. The results show that the fluid film stiffness and leakage rate would increase at initial stage of face wear, and the leakage rate increases with the number of worn U grooves. When sealing dam is penetrated by debris, fluid film stiffness will drop abruptly and leakage will increase sharply. Often, there are some worn cracks onto seal faces at the same time in practice, therefore such a seal will break down with great quantity of leakage due to only a depth penetrated scratch or a flaw.