Engineering Physics Annotation << Back INFLUENCE OF THE METHOD FOR DETERMINING THE THERMAL CONDUCTIVITY COEFFICIENT OF GAS FUEL COMBUSTION PRODUCTS ON THE CALCULATION ACCURACY A.V. NUZHDIN, N.YU. KURNAKOVA The purpose of this article was to find out the infl uence of the method for determining the thermal conductivity coefficient on the accuracy of its calculation. Calculations were made for three types of gaseous fuel: natural gas, associated gas and industrial gas. The research methods in the work were to bring the calculations of the thermal conductivity in two ways: a simplified calculation according to the additivity rule, using the mass or volume fractions of the components of the combustion products and a more accurate calculation according to the Mason and Saxen equation. The article shows that the method of determining the thermal conductivity coefficient of combustion products has a significant impact on the accuracy of the result obtained. The determined thermal conductivity coefficient according to the additivity rule using volume and mass fractions of the components of the combustion products is greater than that calculated by the Mason and Saxen equation for any coefficients of excess air and temperature of the combustion products. With an increase in the temperature of the combustion products, the error in determining the thermal conductivity coefficient in both cases decreases due to an increase in the values of the thermal conductivity coefficients. The use of simplified calculation methods leads to an increase in the thermal conductivity coefficient by an average of 6 % – 3 %, depending on the temperature of the combustion products, compared with the values obtained by the Mason and Saxen equation. Keywords: combustion products; natural gas; associated gas; industrial gas; coefficient of thermal conductivity; calculation according to the additivity rule, Mason and Saxen equation; volume and mass fractions of components. DOI: 10.25791/infizik.7.2022.1274 Pp. 16-23.