Wide band cumulative absorption coefficient distribution model for overlapping absorption in H2O and CO2 mixtures

He, Jing; Cheng, Way Lee; Buckius, Richard O.

doi:10.1016/j.ijheatmasstransfer.2007.05.014

Cited by 6 publications

(1 citation statement)

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“…However its error may be high as much as 70% [16]. Based on exponential wide band model, Buckius and coworkers [17][18][19][20][21] developed a wide band k-distribution model, which expresses the main wide bands absorption coefficients of H2O and CO2 in terms of the cumulative distribution function. Because this model is based on exponential wide band model, its accuracy and applicability are limited.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Infrared Signature Emitted by Liquid Rocket Plume Using Wide Band K-Distribution Model

Yin

Liu

2012

AMR

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A new wide band k-distribution model has been developed and used to investigate infrared radiation signatures of liquid rocket plume in some detectors’ working spectrum regions, in which the temperature and the gas molar concentration fields are solved using engineering empirical formulations. Based on the line parameters in HITEMP database, absorption coefficient variables of water vapor and carbon dioxide corresponding to 12-point Gauss-Lobatto quadrature points are derived and expressed as a simple formulation. The absorption coefficient variables of mixture are obtained by summing the absorption coefficient variables of individual gas species under the hypothesis that the k-distributions are statistically uncorrelated. Its validity for the numerical prediction of liquid rocket plume radiation is verified by comparison with line-by-line approach (LBL). Compared with line-by-line calculations, the maximum relative errors of the new band model are less than 10 % in the detectors’ working spectrum regions, while the computational time of the new band model is less than 1/1000 of LBL. The effects of fly parameter on infrared radiation signatures of liquid rocket plume are studied using the new model. The results showed that the integral radiation intensities of liquid rocket plume increase with the nozzle exit temperature, Mach number and the ratio of nozzle exit pressure to atmospheric pressure. The radiation intensity variation trend for liquid rocket plume with altitude is different for different detectors’ working spectrum regions.

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