CMC flame tube test box and test method thereof

Abstract

The invention discloses a CMC flame tube test box device, which can well simulate the working conditions in a CMC flame tube: low-temperature and high-temperature air flows, a strong backflow area is formed through a test box body, and the surrounding air flow and temperature distribution condition when the CMC flame tube works can be well simulated; in the invention, various variables can be changed, and gas impact conditions in combustion chambers of different models can be simulated by replacing the detachable high-temperature gas inlet ducts with different angles and calibers. Thus, different working conditions of the CMC flame tube can be simulated by changing parameters such as air inlet temperature, speed and pressure; and the cooling efficiency and the like of the air film holes can be tested by changing the shapes, the distribution and the like of the air film holes in the test piece. According to the invention, various physical quantities can be measured; the temperature distribution on the surface of the flame tube can be measured through the thermal infrared imager; moreover, speckles can be sprayed on the surface of the test piece, strain distribution of the test piece is measured through a DIC measurement system, periodic thermal load can be applied to the test piece, and the damage condition of the test piece is observed.

Description

technical field [0001] The invention relates to the field of aero-engine testing, in particular to a CMC flame tube test chamber and a testing method thereof. Background technique [0002] Aeroengines continue to increase the temperature before the turbine in the pursuit of high performance, which will impose increasingly stringent requirements on the high-temperature strength, corrosion resistance and oxidation resistance of the hot-end component materials. It is said that the thrust-to-weight ratio of the next-generation military engine will reach 15-20, and the temperature before the turbine of the engine will reach 2200K. This poses a severe challenge to the material selection and design of the aero-engine combustor flame tube. Compared with superalloys, ceramic matrix composites (CMC) have excellent properties such as high temperature resistance, low density, metal-like fracture behavior, insensitivity to cracks, and no catastrophic damage. If the ceramic matrix compo...

AI Technical Summary

Problems solved by technology

Some test devices verify its life by directly spraying flames on the wall of the flame tube, and some test devices place the specimen in an atmosphere of high-temperature airflow, but the direction of the flow is quite different from the actual flame tube. The environment simulated by the above test devices The flow field and temperature distribution of the actual flame tube are quite different

Some test devices choose the periodic model of the combustion chamber to establish, but this method is expensive, difficult to test, and the universality of the device is poor

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