Method of measurement of orifice or interstitial flow in rotating parts of turbines

Abstract

A method of measuring orifice or interstitial flow in rotating parts of a turbine. The invention provides a method for testing the hole or gap flow rate of a rotating part, which includes the following specific steps: 1) sealing the hole or gap to be measured on the rotating part, testing the flow field parameters of the turbine, and measuring, Flow through the steam seal gap between the mover and the stator of the rotating part to obtain the flow curve; 2) Release the seal of the measured hole or gap on the rotating part, and then test the flow field parameters of the turbine, measure and Step 1) Under the same working condition, the total flow flowing through the rotating part is obtained to obtain the flow curve; 3) According to the flow curve obtained by the two tests corresponding to the same working condition, the flow difference curve is obtained by interpolation conversion and fitting, which is the corresponding working condition. flow curve through the measured hole or gap in the rotating part. According to the flow curve obtained by the method of the present invention, component parameters such as the size of the balance hole of the impeller and the size of the fir tree-shaped blade root gap are effectively selected, which is beneficial to the effective design, material selection and manufacture of the turbine.

Description

technical field [0001] The invention relates to the field of flow measurement, in particular to the flow test research on the holes or gaps of rotating parts such as impeller balance holes and rotor blade root installation gaps of turbines such as steam turbines and gas turbines. Background technique [0002] Whether the flow coefficient of the diaphragm steam seal, the radial steam seal at the root of the moving blade, the balance hole of the impeller and the installation gap of the fir-tree-shaped moving blade root on the rotating parts of the steam turbine, gas turbine and other turbines is correct, which affects the relationship between the various structures. Therefore, the size of the impeller balance hole, the selection of the installation clearance of the rotor blade root, and the accuracy of the axial thrust and efficiency calculation of the rotor of the steam turbine unit are affected. [0003] At present, the research methods for the small gap flow on the above-me...

AI Technical Summary

Problems solved by technology

Because the flow in the holes or gaps on the rotating parts of the turbine does not exist alone, it is often mixed with the gap flow between the static and dynamic, and cannot be distinguished separately, so the holes or gaps in the rotating parts cannot be measured separately

Therefore, there is no method for measuring the flow rate of the holes or gaps of the rotating parts of the turbine through the test of the parameters of the turbine flow field at home and abroad.

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