Safety Analysis and Measures for Small Volume Flow of Turbine Last Blade
When the final stage blade operates under low volume flow conditions,due to the instability of the flow field,there may be operational safety risks such as sudden increase in blade dynamic stress,excessive strength and vibration caused by blowing temperature rise,and increased water erosion.In response to the above issues,taking the low-pressure blades of a steam turbine in a certain power plant as an example,the operational safety of the final stage blades under small volume flow rate was evaluated,and waterproof corrosion measures for the final stage blades were provided.The results show that the maximum dynamic stress of the blades is about 40％of the allowable value,and the strength and vibration verification meet the requirements.The waterproof and corrosion measures are effective,and relevant experience can provide reference for the flexibility transformation of similar units.
last stage bladesmall volume flowstrengthvibrationdynamic stress
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