| Citation: | HUANG Y Z，QUAN Y K，XU G Q，et al. Transient heat flow measurement method based on Laplace transform[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（12）：3834-3841 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0904
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Regarding the issue of transient heat flux measurement on the surface of hot end components of aero-engine, for an advanced thin-film heat flux sensor with a transverse temperature difference measurement structure, differential equations of transient thermal conductivity were established by adding the time term into the transient thermal conductivity model. The Laplace transform method and the deconvolution method were used to solve the thermal conductivity equations. The transient surface heat flow measurement method of the thin-film heat flux sensor was obtained and verified by numerical simulations. The results show that this method breaks through the limitation of the original steady state measurement and is suitable for the transient heat flow measurements on solid surfaces. The calculated surface heat flow of the heat flow meter is in good agreement with the true value. In particular, under the condition of surface step heat flow, the measurement accuracy is about 8.2%. Under the condition of sinusoidal heat flow at 100 Hz, the measurement accuracy is about 4.0%.
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