Wavelength modulation spectrum-based electric arc wind tunnel water leakage fault diagnosis and measurement system

Abstract

The invention discloses a wavelength modulation spectrum-based electric arc wind tunnel water leakage fault diagnosis and measurement system. A signal generation module generates a superposed signal of sawtooth waves and sinusoidal signals and transmits the superposed signal to a laser controller, and the laser controller adjusts the wavelength of a laser output module; a laser signal output by the laser output module outputs free laser through the laser emission module and passes through supersonic airflow at an outlet of an external spray pipe, the laser signal penetrating through the supersonic airflow is received by the laser receiving module, and the received laser signal is acquired by the data acquisition module and subjected to photoelectric conversion, the laser signal is converted into an electric signal and the electric signal is sent to a data analysis module; and the data analysis module analyzes and processes the electric signal in real time and judges whether the operation of the external arc heater is abnormal or not according to the change of the spectral signal intensity.

Description

technical field [0001] The invention relates to an arc wind tunnel water leakage fault diagnosis and measurement system based on wavelength modulation spectrum, which is used for arc wind tunnel surface simulation tests and belongs to the research field of aircraft ground aerodynamic thermal tests. Background technique [0002] The arc wind tunnel is the main ground test equipment for the assessment of aircraft thermal protection and heat-resistant materials. The core of the equipment is the arc heater and nozzle. It uses the arc heater to generate a high-temperature environment for aircraft re-entry, and uses nozzle acceleration to obtain a supersonic inflow environment for aircraft re-entry. Due to the harsh thermal environment of the aircraft, the arc heater and the nozzle are subjected to high enthalpy, high heat flow, and high pressure for a long time. The equipment itself must use inner runner circulation cooling equipment to ensure the normal operation of the equipmen...

AI Technical Summary

Problems solved by technology

If there is water leakage in the arc heater and nozzle, the cooling water will damage the operation of the equipment, burn the equipment, and destroy the heat-resistant material model of the aircraft at the same time, resulting in the loss of equipment and test progress. Top priority for ground testing

At present, with regard to the fault diagnosis of arc heaters, various attempts have been made at home and abroad. Foreign countries analyze the abnormality of the operating parameters of the arc heater itself, but due to the delayed response of the operating parameters of the equipment, it is impossible to effectively and quickly determine water leakage.

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