Evaluation of spectral radiative properties of gases in high-pressure combustion

Fredrik R Westlye,Benjamin A.K Hartz,Anders Ivarsson,Alexander Fateev,Sønnik Clausen

doi:10.1016/j.jqsrt.2022.108089

Fredrik R Westlye, Benjamin A.K Hartz + Show 3 more

Open Access

https://doi.org/10.1016/j.jqsrt.2022.108089

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Abstract

Radiative heat transfer affects local flame temperatures, and thus pollutant formation in high-pressure diffusion flames but the radiation properties of major gas species at pressures and temperatures relevant for combustion engines are not well known. In order to facilitate radiative transfer calculations in these types of flames, new and already published CO2 and H2O absorption spectra at high pressure and temperatures have been used to validate their modelled spectra based on the HITEMP 2010 database. Corrections for non-Lorentzian behavior of collisional-broadened lines have been evaluated, where an adjustable pseudo-Lorentzian line profile has been correlated for CO2 − N2 mixtures over a wide range of pressure, temperature and concentration. A fixed pseudo-Lorentzian line profile was found to give similar performance to previous empirical line corrections when comparing to available experimental H2O data over a relatively wide pressure and temperature range. The work has led to the release of an in-house MATLAB code, named RadISpeC freely available for download. The code efficiently produces spectra for radiation calculations for both soot and gas at high pressures and temperature.

Highlights

Studies of radiation properties of gases at high pressure and temperature were initially related to the study of planetary atmospheres and emission from stars within the field of astronomy and astrophysics [1,2,3]
The present study aims to develop simplified spectral models suitable for use in calculations of radiative heat transfer, spectroscopic measurements and tomographic thermometry of highpressure flames, those occurring in compression ignition engines
These models consist of line-by-line radiation spectra calculations for major gaseous combustion products (CO2 and H2O) empirically modified to account for effects of high pressure and temperature

Summary

Introduction

Studies of radiation properties of gases at high pressure and temperature were initially related to the study of planetary atmospheres and emission from stars within the field of astronomy and astrophysics [1,2,3]. Cult, time consuming and computationally expensive because they require spatial integration at each wavelength of high spectral resolution gas radiation spectra for each of the major gas components such as CO2 and H2O Their radiation spectra are defined by local gas temperature variations and the individual emission spectra of CO2 and H2O at various pressures/temperatures are required inputs to the calculations. The present study aims to develop simplified spectral models suitable for use in calculations of radiative heat transfer, spectroscopic measurements and tomographic thermometry of highpressure flames, those occurring in compression ignition engines. These models consist of line-by-line radiation spectra calculations for major gaseous combustion products (CO2 and H2O) empirically modified to account for effects of high pressure and temperature

Modeling of absorption by gases

C E 0 T 0

Conclusion

Findings

Declaration of Competing Interest