System and method for detecting air leakage on combination surface of engine case

Abstract

The invention discloses a system and a method for detecting air leakage on a combination surface of an engine case. The system for detecting air leakage on the combination surface of the engine case comprises a temperature measuring instrument and a data acquisition display, wherein the temperature measuring instrument is fixed, and the measuring range of the temperature measuring instrument is covered by the surface of the case to be measured; the data acquisition display converts the temperature data acquired by the temperature measuring instrument into a thermal image for display. The method for detecting air leakage on the combination surface of the engine case comprises the following steps: 1. a plurality of temperature measuring instruments are adopted, so that the measuring range ofthe temperature measuring instrument is covered by the surface of the case to be measured, and an engine starts to work to scan the joint surface of the mounting edge of the case to be measured; 2, the temperature data detected by the temperature measuring instrument is transmitted to the data acquisition display; 3, the thermal image displayed by a display is acquired, the position of the air leakage is judged according to the color difference of the thermal image at different positions, and if the color of a certain part is inconsistent with the color of other parts in the same color area,the part is the air leakage part. The system and method for detecting air leakage on the combination surface of the engine case is used for determining whether the combined surface of the case leaks or not and the leaking part in the bench test run and the field use, and adopts a targeted control measure to improve the use reliability of the engine.

Description

technical field [0001] The invention belongs to the field of aero-engine testing, and relates to a detection system and method for air leakage at the joint surface of an engine casing. Background technique [0002] With the advancement of science and technology, higher requirements are put forward for the design, manufacture and testing of aero-engines, in order to achieve the high-performance and high-reliability technical indicators of aero-engines. There is a further understanding of the problem that air leakage will cause insufficient performance of the engine. Aeroengine casing components not only provide mounting locations for stator assemblies, but also provide passages for airflow through the working blades. The connection must be safe and reliable, and at the same time, in order to reduce the loss of air leakage, the joint surface of the connection must have good sealing. Once the casing joint surface leaks, it will not only affect the efficiency of the engine, bu...

AI Technical Summary

Problems solved by technology

Once the casing joint surface leaks, it will not only affect the efficiency of the engine, but also affect or damage the anti-icing system and accessory system, which will seriously affect the reliable operation of the engine

[0003] Regardless of whether it is used on the bench or in the field, it is impossible to use manual methods to check the sealing of the joint surface of the casing. There are three difficulties in manual inspection. Except), the minimum is above 150°C. Once the gas inside the casing leaks, it is easy to burn the human body; secondly, due to the limited leakage of gas inside the casing, the limited internal gas leakage and the large amount of external temperature of the casing are relatively low when the engine is running. The gas is mixed instantaneously, or is blown away instantaneously due to the ejection airflow, so that the gas leakage site is not easy to be found; thirdly, due to the high noise and large vibration during the engine test run, people are not allowed to enter the test workshop or approach it in the test run safety regulations. engine

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