Session: 20-07 Combustion & Heat Transfer
Paper Number: 80805
80805 - The Design and Optimisation of a 100% Hydrogen Micro Gas Turbine Micromix Combustor: Preliminary Hydrogen Injection Depth Characterisation Using Cold Flow Steady RANS
In a modern electricity grid, with fluctuating renewable energy input and problems linked to construction of large power plants in densely populated areas, local, flexible and zero-emission electricity and heat production becomes evermore important. Consequently, we research the design and optimisation of a hydrogen fuelled micro Gas Turbine (mGT). This paper focusses on our continued development and optimisation of the low-NOx hydrogen combustion chamber. Based on previous work, we saw that the hydrogen injection depth was critical in minimising thermal NOX formation. To characterise the hydrogen Jet in Cross Flow (JICF) mechanism more deeply, we now first designed a simplified single nozzle variant of the micromix geometry. Using this test geometry, we analysed the relation between the hydrogen injection pressure and the hydrogen injection depth, perpendicularly into the air flow, using cold flow steady RANS simulations. From these simulation results we obtained a preliminary optimal range for the injection pressure, so that the hydrogen does not protrude too far into the air stream (thereby increasing the residence time and increasing the possibility of higher thermal NOx formation), nor too little (thereby reducing the mixing of both fuel and air and increasing the chance of combustion too near to the wall). Based on these results, we designed a second version of the micromix combustor (still without the combustor liner and the secondary air flow) for hot flow steady RANS simulations, to validate the optimal hydrogen injection pressure range from the single-nozzle, cold flow results, for minimal thermal NOX formation. We also plan LES simulations.
Presenting Author: Cedric Devriese University of Mons
Presenting Author Biography: Cedric Devriese graduated as a Master of Science in Electromechanical Engineering (Mechanical Energy Engineering) from the University of Ghent in Belgium in 2017. Immediately after that, he founded his own company, TURBOTEC, specialized in the design, construction and testing of custom turbomachines. In January 2019, he started his joint PhD at the University of Mons in Belgium and at the Eindhoven University of Technology in the Netherlands, on the design and optimisation of a hydrogen fuelled micro gas turbine.
Authors:
Cedric Devriese University of MonsSimon Snijders Eindhoven University of Technology
Ward De Paepe University of Mons
Rob Bastiaans Eindhoven University of Technology
The Design and Optimisation of a 100% Hydrogen Micro Gas Turbine Micromix Combustor: Preliminary Hydrogen Injection Depth Characterisation Using Cold Flow Steady RANS
Paper Type
Technical Paper Publication