Band model parameters for the 4.3 μm CO2 band from 200 to 3000°K—II. Prediction, comparison to experiment, and application to plume emission-absorption calculations

Bernstein, Lawrence S.; Robertson, David; Conant, John A.

doi:10.1016/0022-4073(80)90005-9

Cited by 26 publications

(3 citation statements)

References 16 publications

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“…The band models delivered with RAD3D are summarized in Table 1 The model "CO2-43BIG" is an Aerodyne-developed model 11 , like "CO2-43ARI". Band models are used to evaluate the optical properties of the plume at moderate spectral resolution, typically from 1 -20 cm -1 , and a set of parameters are supplied for common molecules.…”

Section: Radation Transfermentioning

confidence: 99%

Modeling of spectral emission images from fully 3D gaseous combustion plumes

Conant

2001

SPIE Proceedings

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The prediction of infrared emissions from gaseous plumes is an important tool for remote sensing, heat transfer, and vulnerability assessment. We have developed a software model called "RAD3D" that generates hyperspectral images of 3D gaseous plumes. The model directly ray-traces through gas volumes input in the PLOT3D format. In addition to single and arrays of lines of sight, the model will automatically generate additional lines of sight to resolve image structure. Outputs of the model include hyperspectral and in-band radiances and transmittances, along with range-to-plume images. Opaque body regions may be embedded within the gas volume.

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Section: Radation Transfermentioning

confidence: 99%

Modeling of spectral emission images from fully 3D gaseous combustion plumes

Conant

2001

SPIE Proceedings

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“…Therefore, LBL approach is impractical and only used as benchmarks for judging the validation of other approximate models. The statistical narrow band (SNB) model is used frequently in rocket plume radiation calculation [5,8,14]. However, it is difficult to implement SNB model in multi-dimensional medium because its formulations are based on the gas transmissivity rather than the fundamental absorption coefficient.…”

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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“…The spectral resolution required varies widely with respect to the application. The Line-By-Line (LBL) approach [1][2][3][4] is the most precise, but the most CPU time consuming. Narrow-Band-Statistical models (NBS) [5][6][7][8][9][10] are rougher, and cheaper ; their parameters can be derived from LBL calculations [4,11,12] or directly from experimental results ; reference [12] gives a rather exhaustive bibliography on these models.…”

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confidence: 99%

A fictive gas-method for accurate computations of low-resolution IR gas transmissivities : application to the 4.3 μm CO2 band

Leon

Taine

1986

Rev. Phys. Appl. (Paris)

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La méthode proposée de calcul de la transmittivité IR, moyennée sur un intervalle spectral de 25 cm-1, de colonnes gazeuses hétérogènes et anisothermes est applicable aux calculs de télédétection de signature IR et de transferts radiatifs thermiques. Le principe de cette méthode consiste à considérer des gaz fictifs caractérisés chacun par un ensemble de raies d'absorption qui présentent le même comportement en fonction de la température. Les paramètres de ce modèle sont obtenus à partir d'un code de calcul raie par raie ; ils sont tabulés en fonction de la température et d'une largeur de raie adimensionnée. Ce modèle conduit à des résultats beaucoup plus proches de ceux du calcul raie par raie que les modèles statistiques à bandes étroites, et demande des temps de calculs plus réduits que l'approche raie par raie. Abstract. -The transmissivities of inhomogeneous or nonisothermal gas columns are computed for a 25 cm-1 resolution ; the method is suitable for teledetection or coupled radiative and convective transfer applications. The basic idea is to consider fictive gases, characterized by a set of lines of the real absorbing gas, which have a common behaviour with respect to temperature. We use a line-by-line approach to obtain the parameters of our model, which are tabulated as functions of the temperature and of a non dimensional linewidth parameter. This model leads to a better agreement with a line-by-line calculation than narrow-bandstatistical models and requires smaller computer times than the line-by-line approach.

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Band model parameters for the 4.3 μm CO2 band from 200 to 3000°K—II. Prediction, comparison to experiment, and application to plume emission-absorption calculations

Cited by 26 publications

References 16 publications

Modeling of spectral emission images from fully 3D gaseous combustion plumes

Modeling of spectral emission images from fully 3D gaseous combustion plumes

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

A fictive gas-method for accurate computations of low-resolution IR gas transmissivities : application to the 4.3 μm CO2 band

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