Conjugated heat transfer and temperature distributions in a gas turbine combustion liner under base-load operation

Abstract

Prediction of temperature distributions on hot components is important in development of a gas turbine combustion liner. The present study investigated conjugated heat transfer to obtain temperature distributions in a combustion liner with six combustion nozzles. 3D-numerical simulations using FVM commercial codes, Fluent and CFX were performed to calculate combustion and heat transfer distributions. The temperature distributions in the combustor liner were calculated by conjugation of conduction and convection (heat transfer coefficients) obtained by combustion and cooling flow analysis. The wall temperature was the highest on the attachment points of the combustion gas from combustion nozzles, but the temperature gradient was high at the after shell section with low wall temperature.

Effect of thermal stress on creep lifetime for a gas turbine combustion liner

“…3(a) shows the distributions of von Mises equivalent stress on the surface of the combustion liner substrate. The highest stress is locally induced at the inlet of the rib-roughened region that exactly matches the highest temperature region [19]. Ó2010 Journal of Mechanical Science and Technology).…”

“…The boundary conditions for calculating the thermal stress and strain distributions, such as substrate temperature distributions and environment gas temperature are adopted from our previous work [19].…”

“…In our previous study [19], we have dealt about the flow behavior of the combustion gas and coolant, convective heat transfer on the combustion liner, and temperature distributions of the whole combustion liner under the base-load operation. The present study employs these data in order to calculate the thermal stress and lifetime.…”

Material design of a film cooling system using experimental heat transfer data

“…In other words, if an operation condition is unsuitable, local thermal cracks and structural failure may occur due to the high thermal stress. Therefore, a thermal analysis [9][10][11] and a failure analysis [12][13][14][15][16] are required for an effective thermal design.…”

“…Kim et al [9] investigated the heat transfer and temperature by using a rib-roughened surface and an impinging jet cooling system in an actual combustion liner. They found that the temperature distributions are induced by the attachment and mixing of high temperature flow from combustor nozzles.…”