The influence evaluation of taking into account the conjugate heat transfer between combustion chamber parts and between the reacting flow on the results of modeling nitrogen oxides


Аuthors

Mitrofanova Y. A.*, Zagitov R. A.**, Trusov P. V.***

Perm National Research Polytechnic University, PNRPU, 29, Komsomolsky Prospekt, Perm, 614990, Russia

*e-mail: YuAMitrofanova@yandex.ru
**e-mail: zagitoff@inbox.ru
***e-mail: tpv@matmod.pstu.ac.ru

Abstract

This article is devoted to testing the applicability of the hypothesis about the influence insignificance of the conjugate heat transfer between the reacting flow and the solid walls of the flame tube and gas collector on the calculated level of nitrogen oxide emissions. Because of this hypothesis, it is possible to significantly reduce the calculation time by reducing the number of elements of the computational mesh and simplifying the mathematical model. The object of the study is a single-phase multicomponent reacting flow of a fuel-air mixture. To describe the turbulent flow of the air-fuel mixture in the combustion chamber of a gas turbine, the Favre averaging approach of the Navier-Stokes equations was used. The SST turbulence model was used to close the resulting system. The system of equations was solved numerically using the control volume method. A combined EDM/FRC combustion model was used to find the rate of the mixture components formation. The turbulence model used in this work is hybrid, it is applicable for the parameter y plus ~ 1. To achieve this condition, three variants of computational grids were constructed with different numbers of prismatic layers at a constant growth rate of cell sizes. The results of three-dimensional calculations showed that the effect of the absence of conjugate heat transfer on the calculated level of nitrogen oxide emissions did not exceed 10% in the most heat-loaded operating mode of the gas turbine. The total heat flow through the walls of the flame tube and gas collector did not exceed 0.5% of the total amount of heat released during fuel combustion. Thus, conclusions were made about the applicability of the hypothesis under consideration. The results of the work can be important for CFD – engineers and designers working in the combustion chamber department.

Keywords:

gas fuel combustion, gas turbine engine, Reynolds-averaged Navier–Stokes equations, Menter's Shear Stress Transport, conjugate heat transfer

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