Simulation disc for low-cycle fatigue test of turbine working blade

Abstract

The invention discloses a simulation disc for a low-cycle fatigue test of a turbine working blade, which relates to the technical field of gas turbine engines. The simulation disc comprises a disc body, 2-8 mortises are uniformly arranged on the rim of the disc body along the circumferential direction, a U-shaped groove is arranged between every two mortises on the disc body along the circumferential direction, and the profile contour of the U-shaped groove is composed of an arc C1, a straight line L1 and a straight line L2. The straight line L1 and the straight line L2 are symmetrical along the middle radial segmentation line of the arc C1, the extension lines of the straight line L1 and the straight line L2 intersect at the center of the disc body, the U-shaped groove can reduce the centrifugal load of the wheel disc, reduce the circumferential stress of the wheel center, retain enough mortise bending rigidity, reduce the mortise bending stress, remarkably reduce the stress level of dangerous parts such as the wheel disc mortise and the like, and the anti-fatigue performance of the wheel disc is effectively improved, so that the risk of test failure caused by advanced failure of the wheel disc is avoided.

Description

Technical field [0001] The present invention relates to the technical field of gas turbine engine, and more particularly to a turbine working blade low cycle fatigue test. Background technique [0002] Aviation engine turbine blades serve in extremely complicated, harsh conditions, usually develop low cycle fatigue tests in the engine development or troubleshooting task. The turbine working blade test member is coupled to the turbine disk, and the axial limit of the lock piece is used, and the turbine rotor assembly is connected to a high-speed rotating tester on a high-speed rotary tester by a shift segment. In the experiment, a real turbine disc is generally used as a car, and the blade is mounted on the turbine disk. [0003] The turbocyntial working blade of the turbine disc is the same as the number of turbine of the turbine disc is the same, generally not less than 30 pieces, and the groove is more intensive. [0004] During the low cycle fatigue test of the turbine blade, ...

AI Technical Summary

Problems solved by technology

[0004] During the low-cycle fatigue test of turbine blades, due to the high test temperature, high rotational speed and the dispersion of parts processing, the stress of the tongue and groove of the turbine disc as an accompanying test piece may be higher than the working state under the test load, resulting in over-examination. Premature failure occurs, failing to achieve the purpose of test assessment

In addition, blades are installed on each tongue and groove, which also increases the test cost and processing cycle

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