System and method for detecting leakage of high-temperature gas in high-temperature high-pressure guide pipe of airplane

Abstract

The invention provides a system and a method for detecting leakage of a high-temperature gas in a high-temperature high-pressure guide pipe of an airplane, and belongs to the field of high-temperature high-pressure gas leakage detection. The method is characterized by comprising the following processes that: (1) when the high-temperature gas is leaked from the guide pipe, the ambient temperature around the guide pipe is raised quickly; and due to the heating action of the gas, the resistance value of a thermistor is changed rapidly along the raising of the temperature so as to judge whether the gas is leaked; and (2) according to the theory, the variations of the resistance values of the ends AB, AD, CB, CD, AC and BD are detected at the same time; and if the resistance values of three ormore paths are different from the rated values, the gas in the area is leaked. Compared with other detection systems, the system has the advantages of simple structure, high reliability and the like,and can synchronously realize leakage judgment and position location of the high-temperature gas guide pipe of the air plane of other high-temperature gas pipelines. The leakage detection system has great significance for guaranteeing the flying safety and improving the running dispatch rate of the air plane.

Description

Technical field [0001] The invention relates to a high-temperature gas leakage detection system and method in an aircraft high-temperature and high-pressure conduit, belonging to the field of high-temperature gas leakage detection. Background technique [0002] Air management system is one of the important airborne equipment of the aircraft. Its function is to adjust the air for the cockpit and electronic equipment to meet its cooling, heating, pressurization and anti-icing requirements. It mainly includes bleed air, cabin pressure and temperature regulation, and air distribution. , engine and wing anti-icing subsystems, all systems are cross-linked through air ducts. Since the high-temperature and high-pressure gas flows in the duct, mechanical stress and thermal stress will be applied to the duct; at the same time, the connecting parts between the duct and the fuselage will also transmit the displacement and vibration caused by the change of the aircraft load distribution ...

AI Technical Summary

Problems solved by technology

Since the high-temperature gas conduit runs through the fuselage and wings of the aircraft, there are many parts that need to be monitored, so a large number of temperature sensors are arranged, making the wiring very complicated; In addition, the monitoring area of ​​the temperature sensor is related to the leak location and the size of the leak. It is very difficult to choose the layout location, and there are a large number of measurement blind spots.

(2) Pressure measurement method: by setting pressure sensors at different positions of the high-temperature gas conduit, and judging whether there is a leak by measuring the pressure change in the conduit, this measurement method can be used for the measurement of large leaks. For small leaks due to the working conditions of the environmental control system The pressure inside the conduit will fluctuate to a certain extent, coupled with the pneumatic hysteresis of pressure measurement, it is difficult to judge whether there is a leak

Although small leakage has little impact on the performance of the environmental control system, due to the high temperature of the gas, the damage caused by small leakage of the conduit to the surrounding system cannot be ignored

In addition, although the upstream leak can be determined by the downstream pressure change, it cannot accurately locate the specific location of the leak, and this measurement method also has shortcomings such as heavy weight

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