Numerical modeling of radiation heat exchange in combustion chambers and heat exchangers of power installations

Nikolay Moskalenko,Azat Akhmetshin,Ibragim Dodov,V.A Stennikov,N.I Voropai,S.V Alekseenko,N.A Yusifbeyli,M Negnevitsky,P Changwei,S.P Filippov,F.-J Lin,J.-Y Yoon,C Rehtanz,B Sereter

doi:10.1051/e3sconf/202020903018

Abstract

The application of numerical modeling is considered to solve the problems of radiation heat exchange in structurally inhomogeneous two-phase media which are realized during the combustion of fuel in boiler units atmospheric emissions from air carriers when they move at supersonic speeds. The optically active ingredients of the gas phase of the combustion products have a sharp selection of spectral absorption lines (radiation) which causes a difference in the spectral transmission functions for selective radiation from the spectral transmission functions for non-selective radiation (gray body). In the presence of a dispersed phase of the combustion products acute selection is subjected to such a parameter of the radiation propagation medium as the probability of quantum survival. The number of spectral lines determining the spectral transmission functions increases with temperature and is determined by hundreds of thousands of lines at high temperatures. In this paper we consider a closed simulation of radiation heat transfer in combustion chambers when the temperature field in the combustion chambers is calculated first and then the flux of thermal radiation to the tube heat-receiving surfaces.

Highlights

We consider the application of numerical modeling to solve the problems of radiation heat transfer in structurally inhomogeneous two-phase media, which are implemented during fuel combustion in boiler units, atmospheric emissions from aerial vehicles, when aerial vehicles move at supersonic speeds, during forest fires
Active ingredients of the gas phase of combustion products have a sharp selection of spectral absorption lines, which causes a difference in the spectral transmission functions for selective radiation of the propagation medium from the spectral transmission functions for non-selective radiation sources
The number of spectral lines that determine the spectral transmission functions increases with increasing temperature and at high temperatures is determined by hundreds of thousands of lines

Summary

Introduction

We consider the application of numerical modeling to solve the problems of radiation heat transfer in structurally inhomogeneous two-phase media, which are implemented during fuel combustion in boiler units, atmospheric emissions from aerial vehicles, when aerial vehicles move at supersonic speeds, during forest fires. When solving problems of radiation heat transfer by the method of numerical simulation, it is necessary to know the parameters of spectral lines, intensities, half-widths, positions of centers, contours and their dependence on temperature. At high temperatures of combustion products T > 2000 K, it is necessary to take into account the nonequilibrium radiation, when the vibrational temperature of various ingredients differs from the gas-kinetic temperature. In connection with the cumbersomeness of numerical modeling of radiation heat transfer from the parameters of spectral lines, it is urgent to develop approximate calculation methods, when the parameters of the spectral transmission functions are from the data of an experiment performed at different temperatures on flame measuring complexes. A closed simulation of radiation heat transfer in combustion chambers is considered, when the temperature field in the combustion chambers is first calculated, and the fluxes of thermal radiation onto the heat-sensing pipe surfaces

Parameterization of radiation characteristics

Closed modeling of radiation heat transfer in multi-chamber furnaces

Findings

Conclusions