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Title The optimization of a gas turbine intake system using computational fluid dynamics
Translated title Optimering af gas turbine indløbssystem med computational fluid dynamics
Author Stronach, Robert (Copenhagen University College of Engineering, IHK)
Supervisor Bertelsen, Michael (Copenhagen University College of Engineering, IHK)
Institution Ingeniørhøjskolen i København, IHK, DK-2750 Ballerup, Denmark
Thesis level Bachelor thesis
Education Diplomingeniør, Maskiningeniør
Education Bachelor of Mechanical Engineering
Publication date 2013-06
Abstract The study of gas turbine performance is an important task due to their high fuel consumption and the emissions of these engines. One approach of optimizing their efficiency is to increase the performance of the turbines intake system. For the purpose of this project, the performance of an intake is defined as: The pressure loss through the intake and the flow uniformity at the bell mouth of the compressor inlet. The present study contains a numerical investigation on a gas turbine intake performed by a full CFD simulation.

A CFD model was constructed where a simplified real turbine intake geometry was discretized. While an outer domain was created to model the flow into the intake.

The numerical investigation consisted of two parts. In the first part, a numerical validation was performed. A mesh independence study was conducted. Turbulence models were compared using Reynolds Averaged Navier Stokes simulations, closed by the standard k-epsilon model, the k-omega model and the k-omega SST model. A transient calculation using the SAS SST model was performed to validate the steady state solutions. Finally, the transient results were compared with an empirical 1D model.

The second part of the numerical investigation consisted of a design optimization study on the intake geometry. Eight new designs for the geometry of the intake were created. Four designs consisted of one individual design change. These included the introduction of guide vanes, a rotation of the silencer, the introduction of a nozzle and the reduction of the width of the baffles. Four additional designs consisted of a combination of these new geometry components.

Results showed that the pressure loss could be reduced up to 24 %, providing a saving of 8kW. While the flow uniformity at the compressor inlet could be increased by 37 %.
Pages 137
External partner Ledere og medarbejdere i private virksomheder
Admin Creation date: 2013-06-14    Update date: 2013-09-27    Source: ihk    ID: ihk-14845004    Original MXD