Measuring system and method of torsion angle of rotor blades in operating state of engine

Abstract

The invention belongs to the field of engine rotor performance testing, and particularly relates to a measuring system and method of a torsion angle of rotor blades in an operating state of an engine.The measuring system comprises two or more first sensors, a signal processing and collecting module, a rotating speed sensor and a torsion angle processing module; the two or more first sensors are arranged on the inner ring face of a casing and arranged at the front edge and the tailing edge of the axial position of the same to-be-measured rotor blade; the signal processing and collecting moduleis used for receiving sensor data and converting the data into the blade tip arrival time data of the front edge and the tailing edge of the to-be-measured rotor blade; the rotating speed sensor is used for detecting the rotating speed of the to-be-measured rotor blade; and the torsion angle processing module is used for calculating the torsion angle of the rotor blades. According to the measuring system and method of the torsion angle of the rotor blades in the operating state of the engine, on the basis of first-order torsion and measurement thereof, the feasible measuring method, a feasible measuring model and a feasible measuring formula are provided, the measuring points are arranged easily, calculated related parameters are easy to obtain, the measuring system and method are easy toimplement on the engine, and guiding significance is achieved in torsion angle measuring.

Description

technical field [0001] The application belongs to the field of performance testing of engine rotors, and in particular relates to a system and method for measuring the torsion angle of rotor blades in an engine running state. Background technique [0002] For various aeroengines and gas turbines, the blade is one of the main components, which not only affects the overall performance of the engine, but also directly relates to the reliability, durability and life of the engine. The working conditions of the rotor blades are harsh, and the failure rate is high. According to the failure statistics of engine structural parts at home and abroad, blade failures account for about 39% of engine failures. [0003] The working environment of engine rotor blades is harsh, and they are subjected to large centrifugal force loads, complex aerodynamic loads and thermal loads. [0004] The blades will twist under these loads, causing the blade shape to deviate from the ideal aerodynamic de...

AI Technical Summary

Problems solved by technology

[0006] However, for the convenience of calculation, the model and boundary conditions often simplify the analysis; the aerodynamic load on the blade is very complex, and its distribution along the blade height direction and blade width direction is uneven, which can only simplify the analysis; the temperature distribution is not uniform or The difference in the linear expansion characteristics of mutually constrained materials will cause thermal stress. In the calculation, it is often considered that the temperature difference is small, and the thermal stress is often neglected.

These factors lead to a large difference between the simulation analysis and the torsional recovery characteristics of the real blade

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