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Flow field in a gas turbine burner
2010 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This report presents a numerical investigation of diesel fuel spray combustion in SGT-800 gas turbines with ANSYS CFX 11.0. The gas turbine SGT-800 has thirty burners and each burner has four fuel injectors. In this thesis just a quarter of one burner is simulated. The main objective is to get the diesel spray combustion simulation to work and set a frame work for future investigation. Spray consists of two fundamental and consecutive steps: the primary breakup and the secondary breakup. The Blob method is used to model primary breakup and secondary breakup is modeled by Cascade Atomization and Breakup model (CAB). The trajectory and velocity of generated fuel droplets is determined by Lagrangian Particle Tracking. Fuel evaporation is modeled by simulating the mass and heat transfer of generated fuel droplet. The mixing of evaporated fuel with air and combustion of combustible mixture is modeled by multicomponent flow formulation. Burning Velocity Model (BVM) is used to simulate combustion. Flamelet Library for diesel fuel is generated by a special version of CFX-RIF. In order to speed up simulations the reduced Flamelet Library is used. At the end a parameter study is performed to find out important parameters on the fuel concentration field. Studied parameters are working conditions (part load and over load), injection direction (axial and angled injection), injector diameter, fuel surface tension, secondary breakup models, turbulence model and mesh. Also, experiments and their corresponding simulation with ANSYS CFX are done in order to predict droplet distribution size after injection. In this study water is used instead of diesel.

Place, publisher, year, edition, pages
Keyword [en]
Technology, gas turbine, burner, combustion, CFD simulation, Burning, Velocity Model (BVM), Flamelet model, spray, primary breakup, secondary breakup, diesel fuel
Keyword [sv]
URN: urn:nbn:se:ltu:diva-44609ISRN: LTU-PB-EX--10/012--SELocal ID: 261fdb5f-8407-4545-91c3-a0bd4028a795OAI: diva2:1017888
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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