Impact of Radiation on the Wall Heat Load at a Test Bench Gas Turbine Combustion Chamber: Measurements and CFD Simulation

Abstract

Experimental and numerical work has been carried out to determine the wall heat load at the liner structure of a model gas turbine combustion chamber. Measured cross-sectional profiles of the velocity and temperature field inside the chamber could be used to validate various CFD calculations of the combustion flow. It turned out that only a special treatment of the thermal boundary conditions at all liner walls would actually lead to appropriate values of the wall heat flux. Radiation modeling included two radiative properties models (SG single gray gas and WSSG weighted sum of gray gases) and three radiation transport models (P1, DT discrete transfer, MC Monte Carlo). The performance of the WSGG model has been assessed with charts and the impact of the radiation on the liner wall temperature distribution has been studied. The experimental values are matched within 3% deviation with the best combination of transport and radiation property models. The radiation contributes to 20-30% of the total wall heat flux. The present approach enables Siemens PG to access the thermal design of combustors more precisely.

Modeling of the Structure of Heat-Insulating Semi-Transparent Materials and Coatings for Industrial and Transport Power Plants

“…These data correspond to other research results of the diesel engine combustion chambers [3,4,[11][12][13][14][15][16]] and elements of gas turbine plants [2,[17][18]23]. However, as a rule, the developers do not consider the impact of radiation and optical characteristics of heat-insulated elements of power plants on heat transfer [3,4,[11][12][13][14][15][16].…”

“…However, since the 1990s, there appeared a need to create new semitransparent coatings that provide a combined thermal protection of elements of missile body [1][2][3]17], gas turbine plants [2,[8][9][10][17][18] and diesel engines [3,4,[11][12][13][14][15][16] under intensive influence of thermal radiant and convective fluxes of ~1-2 MW/m 2 [3,4,[17][18][19][20] with a share of radiant component up to ~50% [4,[21][22][23][24][25][26][27][28]. A distinctive feature of these materials is their partial transparency to thermal radiation (in the near IR of ~1-2 µm) of red-hot soot particles.…”

Procedure for Simulation of Combustion in the Burner Device of the Low-Emission Combustion Chamber

“…Most of them are devoted to the study of influence of the choice of certain mathematical models of individual physical processes on the results of numerical experiments. Some works analyze combinations of various combustion models with different turbulence models [2] ̶ [7], other works investigate combinations of different combustion models with different mechanisms of chemical kinetics [12], [13], [16], in the third works only the models of radiant heat exchange are studied [8] ̶ [10], in the fourth works combinations of one turbulence model with different combustion models [1], [14] are investigated without taking into account the compressibility of the working medium.…”

A nongray-wall emissivity model for the Wide-Band Correlated K-distribution method

“…Most studies assume that the walls of combustors are black or gray in radiative transfer calculations for simplicity in spite of the fact that the wall materials have different spectral emissivity. This simplification may introduce large errors in the prediction of radiative source term and heat flux [2], which may strongly affect the predicted performance of the combustion devices in terms of thermal protection [3] and pollutant emissions [4]. Therefore, comprehensive and accurate radiative models are necessary for accurately predicting radiative heat transfer in practical problems involving nongray walls and for optimal design of combustion devices.…”