Blade tip gap dynamic measurement system and method based on microwave phase difference distance measurement

Abstract

The invention discloses a blade tip clearance dynamic measurement system and method based on microwave phase difference distance measurement. The system comprises a microwave signal generation module, a signal power amplification module, a signal receiving and frequency mixing module, a signal conditioning module, a circulator, a microwave sensor, a signal collection module, and a computer, wherein the microwave signal generation module provides a transmitting signal and a reference signal with stable radio frequency, and the to-be-measured blade reflects the transmitting signal to form a reflected signal; three ports of the circulator are respectively connected with the signal power amplification module, the microwave sensor and the signal receiving and frequency mixing module through signal lines, and the signal power amplification module is respectively connected with the microwave signal generation module and the signal receiving and frequency mixing module through connecting lines; the signal conditioning module is connected with the signal receiving and mixing module through a connecting line, the signal acquisition module is connected with the signal conditioning module through a connecting line, and the computer is connected with the signal acquisition module through a connecting line.

Description

technical field [0001] The invention relates to the field of non-contact distance dynamic measurement, in particular to a blade tip clearance dynamic measurement system and method based on microwave phase difference distance measurement. Background technique [0002] As the core working components of large rotating machines such as aero-engines and gas turbines, moving blades directly determine the performance of major equipment such as aircraft and ships. Among them, the tip clearance parameter between the tip of the moving blade and the inner wall of the casing is the key to affect the working efficiency and safety of the engine. The tip clearance of aero-engine turbine blades is usually designed within 3mm, and for every 0.0254mm reduction in the tip clearance, the fuel consumption rate will decrease by 0.1%, and the exhaust gas temperature will drop by 1°C; however, too small tip clearance will increase the blade The probability of collision and friction with the casing...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the deficiencies of the existing microwave blade tip clearance measurement method, and design a dynamic measurement system and method of blade tip clearance based on microwave phase difference ranging to achieve the following purposes:

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