Method for simulating centrifugal force of moving blades of turbine

Abstract

The invention discloses a method for simulating a centrifugal force of moving blades of a turbine, and relates to the field of moving blade test methods of the turbine. The method comprises that fiveadjacent blades are selected to implement preparation before loading, a hydraulic loading device is arranged and provided with five loading points, each loading point is provided with an abutting block so that the abutting block can abut against the bottom of the corresponding blade, a clamping piece clamps the blades, a corresponding foil gauge is calibrated, a calibration member pasted foil gauge whose material is the same with that of the abutting material is selected, pressure test is carried out to obtain correspondence between pressure and strain, the calibrated foil gauge is installed,and a centrifugal force is loaded. The simulated centrifugal forces of the five blades can be loaded uniformly at the same time, the problem that the measuring method is limited due to limit of materials and space, the measuring precision is higher, and guarantee is provided for blade vibration characteristic test under the effect of the simulated centrifugal force.

Description

technical field [0001] The invention relates to the field of test methods for turbine rotor blades, in particular to a method for simulating the centrifugal force of turbine rotor blades. Background technique [0002] The working environment of the turbine rotor blades of the engine is relatively harsh, and they will be subjected to great centrifugal force during work, resulting in inconsistent blade frequencies between the working state and the static state. In order to avoid blade resonance, it is necessary to study the vibration characteristics of the blades under the working state. For this, it is necessary Simulate the working condition of the rotor blade with centrifugal force, so as to obtain the vibration characteristics of the turbine rotor blade at different operating speeds. [0003] The existing simulated centrifugal force of turbine blades is generally loaded with bolts, so the corresponding measurement method is indirect measurement with a torque wrench. This m...

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Problems solved by technology

[0003] The existing simulated centrifugal force of turbine blades is generally loaded with bolts, so the corresponding measurement method is indirect measurement with a torque wrench. This measurement method is convenient and easy, but the measurement range is small. The bolt material is limited and the accuracy is low, so it is impossible to measure the simulated centrifugal force of the turbine blade in the entire working state, so that the loading is limited, which is not conducive to the smooth development of the vibration characteristic test of the engine turbine blade

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