Johan Kotze a student from the University of Pretoria, South Africa is working in collaboration with The Council for Scientific and Industrial Research (CSIR) in South Africa on performing a CFD simulation of the BMT 120 KS micro-turbine. Johan is using the OMNIS™ platform along with FINE™/Open with OpenLabs™ for the CFD simulation.
More about this project:
Complete gas turbine CFD simulations are used to determine component mismatched as a final step before manufacturing an engine. Due to the size and complexity of a gas turbine, the mesh used to model the geometry in CFD packages are large which consequently takes a long time to converge. Because time is money, methods to reduce the simulation time are developed and tested. One such method is to model combustion as a heat source rather than using complex combustion models built into modern CFD packages which is computationally more expensive. In the open literature methods used to simulate gas turbines were found of which not one of them modelled combustion with a heat source.
This study investigates the accuracy of modelling combustion as a heat source and its ability to determine component mismatches. CFD simulations using the BMT 120 KS micro gas turbine were performed over a large shaft speed range to determine the operating curve of the engine which were compared to experimental data to assess their accuracy. The magnitude of the heat source was determined by matching the EGT of the simulations with that of the experiments. Following this, the endpoint on the operating curve will be investigated to determine the location where the engine chokes.
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