离心泵的汽蚀现象 |
| 离心泵的汽蚀现象 Centrifugal pump cavitation phenomenon 由于叶轮叶片入口附近液体压力小于或等于液体输送温度下的饱和蒸汽压力时，液体就汽化，同时还可能有溶解在液体内的气体逸出，形成大量气泡，气泡随液体流到叶道内压力较高处时又瞬时凝结溃灭。在气泡凝结溃灭的瞬间，气泡周围的液体迅速冲入气泡凝失形成的空穴，形成强大的局部高频高压水击，金属表面因疲劳而产生剥蚀。同时,由于活泼气体（如氧气）的存在以及气泡凝结时产生的局部高温，导致金属表面发生电化学腐蚀。上述这一过程称为汽蚀现象。 As the impeller blades near the entrance to the liquid pressure is less than or equal to the liquid delivery temperatures of saturated steam pressure, the liquid will vaporize, and also may be dissolved in the liquid inside the escape of gas, the formation of large bubbles, bubbles with the liquid flow pressure in Tao Ye higher up the instantaneous condensation Shiyou Bubble Collapse. Condensation in the bubble Bubble Collapse of the moment, the bubble quickly burst into the fluid surrounding the bubble cavity formed by coagulation failure to form a strong local high-frequency high-pressure water hammer, the metal surface due to fatigue resulting from erosion. At the same time, due to active gases (such as oxygen), as well as the presence of air bubbles generated when the local condensation heat, resulting in electrochemical corrosion of metal surface. The phenomenon of this process is called cavitation. |