液体火箭发动机尾焰金属发射光谱仿真与实验研究

The plume of liquid rocket engine contains abundant spectrum information，which can be used to infer the operating and fault conditions of the engine. A high-accuracy numerical method has been established in this paper for the simulations of metal emission spectrum in the plume of liquid rocket engine. The method was based on the line-by-line（LBL）spectrum simulating scheme，and considered the effects of the medium optical thickness. Based on the method，the emission spectrums of iron，nickel，and potassium in the plume were simu⁃ lated when engine failures occurred. The results agreed well with those obtained by the NASA plume simulation code. Besides，experimental verifications of emission spectra of iron and potassium were performed on CH₄/O₂ and C₂H₄/O₂ flames. Results show that the differences of spectrum area and characteristic spectrum peak intensity between simulated and experimental data were below to 2.5%. Last，the capability and limit of optical thin and thick models were evaluated.