Engine environment thermal resistance coating radiation characteristic research system and method

Abstract

The invention discloses an engine environment thermal resistance coating radiation characteristic research system and method. The system comprises a wind tunnel, a Fourier spectrum measuring instrument, an infrared thermal image measuring instrument, and an infrared ellipsometry measuring instrument. A Fourier spectrum measurement method is adopted to measure the infrared spectrum characteristic of a high-temperature medium, an infrared thermal image measurement method is adopted to measure the surface temperature of a coating and a matrix structure, and an infrared ellipsometry measurement method is adopted to measure the surface absorptivity and emissivity of the coating. The transient and steady transfer relation and evolution rule between medium radiation and coating heat energy and radiation energy can be quantitatively obtained under the condition that a wind tunnel simulates real engine thermal cycle, the transient and steady transfer relation and evolution rule between the medium radiation coating heat energy and radiation energy can be quantitatively obtained, and the transient and steady-state thermal radiation barrier rate and the thermal insulation effect of the thermal resistance coating are quantitatively evaluated.

Description

technical field [0001] The invention belongs to the technical field of thermal environment test research, and in particular relates to a system and method for researching the radiation characteristics of an engine environment thermal resistance coating under a wind tunnel simulation of multi-field coupling under a real engine thermal cycle. Background technique [0002] In order to test the barrier effect of various heat insulation technologies on high-temperature environments, a large number of thermal environment experiments have been carried out at home and abroad: in the 1960s, domestic and foreign structural thermal laboratories used thermal test systems using quartz lamp radiation heating as heat sources. Such test systems generally have a total power ranging from several kilowatts to hundreds of thousands of kilowatts; in the 1970s, researchers began to develop graphite heaters. Process the graphite into a heating element according to the shape of the test object, hea...

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Problems solved by technology

However, the heating device commonly used at present has a very low temperature rise rate (<5°C), and the existing test equipment is mostly used to characterize the steady-state thermal radiation characteristics of protective materials in high-temperature environments

[0003] The actual temperature rise rate of the engine can reach 100°C. With the extreme temperature change, the thermal stress of the material will also change rapidly, which will easily lead to problems such as thermal expansion and thermal deformation.

The expansion and deformation of the material will have adverse effects on the mechanical properties and thermal insulation protection effect of the surface coating, and even induce coating failure.

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