Method and device for measuring water leakage of rated guide vane of water turbine

Abstract

The invention provides a method and device for measuring rated guide vane water leakage of a water turbine. The method comprises the following steps: determining reference pressure head on the basis of pressure difference between water pressure in a water inlet pipe of the water turbine and water pressure in a tail water pipe when a flat pressing facility of the water turbine is closed; and determining the rated guide vane water leakage of the water turbine on the basis of the reference pressure head, the area of the horizontal cross section of an inclined shaft section of the water inlet pipe of the water turbine or the area of a ventilating hole of the water turbine. According to the method and device for measuring the rated guide vane water leakage of the water turbine, an algorithm is simple, calculating parameters are less, the water leakage of a gate does not need to be measured, and the testing efficiency of a testing field for the rated guide vane water leakage of the water turbine is improved effectively.

Description

technical field [0001] The invention relates to the technical field of on-site testing of hydroelectric power generation, in particular to a method and a measuring device for measuring water leakage of rated guide vanes of hydraulic turbines. Background technique [0002] Water leakage in the guide vanes of hydraulic turbines is a common problem. Excessive leakage of guide vanes will not only cause waste of water resources, but also aggravate gap cavitation damage, and even cause the turbine to fail to shut down normally; or, in the shutdown state, the guide vanes Excessive water leakage caused the turbine to squirm and cause the thrust tile and guide tile to be burned. Therefore, it is generally required to measure the water leakage of the guide vane before and after the overhaul of the turbine to check the sealing effect and check the maintenance and adjustment quality of the guide vane. [0003] The existing guide vane leakage measurement method is to express the nominal...

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Problems solved by technology

[0005] In order to solve the problems existing in the existing measurement method due to the large number of parameters involved and the complicated test process, which lead to large errors in the measurement results and affect the construction period, the embodiment of the present invention provides a method and device for measuring the water leakage of the rated guide vane of a hydraulic turbine

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