Pressure sensor system for compressor outlet pressure measurement

Abstract

The invention discloses a pressure sensor system for compressor outlet dynamic pressure measurement. Compressor outlet pressure is collected and output as a voltage signal by a pressure sensitive device through a short measuring tube, and the voltage signal is processed by a signal processing module into a temperature compensated voltage signal to be output. A compressor outlet dynamic pressure sensor system is jointly formed based on the short measuring tube, the pressure sensitive device, the signal processing module, a pressure shell, a fixed seat and an output signal line connector. The system can reliably and accurately obtain the dynamic total pressure at high temperature, and has important significance for engine fault diagnosis.

Description

technical field [0001] The invention relates to a pressure sensor system for measuring the outlet pressure of a compressor, which belongs to the field of aeroengine control. Background technique [0002] The total pressure signal of the compressor outlet airflow has three characteristics - high temperature, fast dynamic response and fast stagnation of the airflow. Usually the temperature range of the engine inlet airflow is -50℃~+65℃. After being compressed by the compressor, the outlet air temperature will be as high as several hundred degrees Celsius. For example, the outlet air temperature of a high-pressure compressor of a turbofan engine can reach 600°C. Most current pressure sensitive components cannot work at this high temperature. The change and propagation speed of gas pressure is fast. Compared with the temperature, speed and other signals in the engine, the pressure is a fast-changing signal. When a rotating stall occurs, the total pressure of the compressor wi...

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Problems solved by technology

[0004] (1) Changes in engine operating conditions, length of bleed air pipe, structural parameters and temperature affect the total pressure recovery coefficient, making the measured pressure unable to accurately and timely reflect the desired result;

[0005] (2) The pressure scanning valves are all imported, and there is no system-level optimization design with the probe and bleed air pipe, and it is impossible to compensate in the subsequent algorithm

[0007] (1) In surge monitoring and control, the solution based on total pressure and static pressure judgment mainly uses diaphragm bellows pressure sensor, which has the problems of low precision, large temperature drift, and poor sensor reliability, which is easy to cause false alarm or The problem of misjudgment,

[0008] (2) Due to the large delay of the measurement system and poor dynamic characteristics, the stall prediction cannot be implemented;

[0009] (3) Due to the lack of research on comprehensive optimization design of working conditions, bleed air pipelines, and measurement algorithms, the anti-breathing scheme that only uses static pressure has a high false alarm rate and cannot be applied on airborne

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