Publication: Three dimensional computational modelling of biofuels combustion characteristics and its effect on turbine blade structure
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Date
2022-05-01
Authors
Sim, Sing Mei
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Abstract
Biofuel has been identified to reduce pollution generated by an aircraft engine. This study is conducted to assess 1) biofuels combustion characteristics and 2) biofuel hot combustion gases effect on turbine blade structure at take-off, top of climb and cruise. The biofuels chosen in this study are Jatropha Bio-synthetic Paraffinic Kerosene (JSPK) and Camelina Bio-synthetic Paraffinic Kerosene (CSPK). The fuels were evaluated as pure (100%) and blend (50%) with Jet–A. The assessments were performed computationally via Computational Fluid Dynamic (CFD) and Fluid Structure Interaction (FSI) available in ANSYS. A comparison of combustion characteristics namely d2 law and penetration length of biofuels with Jet–A through the incorporation of fuel properties and actual combustor inlet data at various flight trajectories is obtained. The usage of biofuels in combustion provides up to a 15%
maximum temperature reduction, and up to 83% reduction in penetration length. JSPK consumes less fuel and has better evaporation rate while producing similar thrust with Jet-A. JSPK has least improvement of fatigue life cycles due to consistent combustion characteristics with Jet-A. CSPK shows the highest improvement in fatigue life cycle during take-off and cruise due to lower temperature at the turbine inlet, thus lower stress and strain at the turbine blade section are obtained. The study generally indicates a correspond relation on temperature effect between combustion and turbine blade. The trend might contradict for a particular evaluation due to the dependency on the boundary condition that correspond to the properties of the fuel tested.