| Citation: | LIU Chongyang, XU Zhenyu, HUANG An, et al. TDLAT measurement method for outlet temperature profile of combustor based on wavelength modulation spectroscopy technology[J]. Journal of Aerospace Power, 2023, 38（1）：116-126 doi: 10.13224/j.cnki.jasp.20210451
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In order to make technical reserves for measurement of combustor outlet temperature profile of high thrust-weight ratio aero-engine in future, the computed tomography technology of tunable diode laser absorption tomography （TDLAT） technology was applied, and the engineering adaptability of measurement method based on wavelength modulation spectroscopy （WMS） technology was studied in a single can combustor under the pressure of 0.5−0.8 MPa condition. The results showed that the measurement of combustor outlet temperature profile could be achieved with time and spatial resolution applying the grid method of orthogonal intersection of multiple light path, using the normalized WMS model whose background was subtracted, the iterative inversion method of variables and the computed tomography （CT） technology; the trends and characteristics of gas temperature and H2O concentration distribution vs. the changes of inlet parameters could be better shown from the reconstruction results; the mean value of TDLAS temperature measurement were lower than that of thermocouple measurement, and the relative error was between 15% and 23%, which was ascribed to the non-uniform flow field, the inaccuracy of spectral model and spectrum parameter calibration, and the imperfections of inversion and reconstruction algorithm, etc, there was still a certain gap between the accuracy of measurement data and the requirements of engineering application.
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