三峡水轮机蜗壳充水加压过程应力分析

Analysis of stress during water filling and pressure increasing process of turbine spiral casing of Three Gorges Power Plant

三峡部分水轮机蜗壳采用充水保压方式埋设。为了了解蜗壳在充水加压过程中的运行状况,以及蜗壳内水压力对蜗壳运行情况的影响,采取在蜗壳上安装钢板应力计监测的方法进行试验和分析研究。通过对蜗壳在充水加压过程中的应力进行监测分析,得出了蜗壳在所试验内水压力条件下能安全运行的结论,并总结出了蜗壳所受应力与蜗壳内水压力的对应变化关系和规律。该成果为后续类似机组蜗壳的安全施工和调试、安全运行提供了依据,也为以后类似机组蜗壳的设计、施工和运行管理提供了一定的参考。

Some of the turbine spiral case of TGP are buried using the technology of water filling and pressure maintaining.In order to acquire the operation condition of turbine spiral case in the water filling process and the influence of water pressure on the operation,we surveyed the stress of the turbine spiral case in the process of water filling by installing plate stress detector.It is concluded that the operation of turbine spiral case under inner water pressure is safe.The laws of turbine spiral case stress changing with inner water pressure are summarized.The result provides a basis for the design,construction and management of similar turbine spiral casing.