Numerical Simulation of Combustion to Identify and Eliminate Power Reduction Problem of a Gas Turbine Engine

In this research, a three-dimensional numerical simulation of the combustion inside the combustion chamber of a typical turboprop engine has been done, and the velocity, pressure, temperature fields as well as the temperature distribution within the wall of the combustion liner have been obtained. The complex geometry of this combustion liner was generated according to the available technical drawings. The computational domain was meshed, and the non-premixed combustion model and the K-ω turbulent model were used to simulate the combustion and the turbulent flow, respectively. With the help of this simulation, the inefficiencies of combustion liners were recognized and by improving them, the problem of reducing the power of several gas turbine engines tested in an industrial test cell was solved. The simulation results of the combustion liner show that the existence of the weld line created in the repair process near its outlet has increased the pressure drop by 25% compared to the typical one, and the effective cross-sectional area of the fluid flow has decreased by 11%. Furthermore, the results show that the velocity profile and the pattern of the outlet temperature of the repaired combustion liner are different from its typical one.