Abstract
In this study, the effects of nozzle size, CO2 and H2O molar fraction, pressure, and temperature on the infrared characteristics of round jets are studied. The backward Monte Carlo method is used to calculate the spectral radiation characteristics and infrared images. The results show that kλ is insensitive to the molar fraction of the species, and it is slightly more sensitive to pressure. Temperature has the greatest effect on the kλ. In addition, the effects of characteristic length of the jet, molar fraction of the species, and pressure on the infrared characteristics are similar. (1) When the characteristic optical thickness of the jet is thick enough, with the increasing of above parameters, the spectral radiance increases at 3 ∼ 3.6 μm and 4.6 ∼ 5 μm, while it decreases around 4.3 μm. The magnitude of the two radiance peaks near 4.1 μm and 4.4 μm remain almost unchanged. However, the peak position moves to both sides. (2) Otherwise, there will be only one radiance peak in 4.1 ∼ 4.4 μm. The height of radiance peak decreases with the decrease of characteristic optical thickness.
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