1. Multifidelity & multi-objective Bayesian optimization of hydrogen-air injectors for aircraft propulsion.
- Author
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Farjon, Philippe, Bertier, Nicolas, Dubreuil, Sylvain, and Morio, Jérôme
- Subjects
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HYDROGEN as fuel , *COMBUSTION chambers , *MATHEMATICAL optimization , *INJECTORS , *COMBUSTION - Abstract
The use of hydrogen as a fuel is a promising way to reduce the emissions of civil aviation but it requires the development of wholly new injectors for the combustion chamber. Thanks to the increase in available computing power, the application of optimization techniques combined with CFD computations is now possible to develop these injectors. Among the optimization approaches, Bayesian optimization is particularly relevant when the objective functions and constraints of the optimization problem are expensive to evaluate which is the case in CFD-based optimization. Besides, the use of a multifidelity strategy allows to reduce the simulation cost of the Bayesian method. Therefore, this paper investigates the application of a multifidelity and multi-objective Bayesian approach to improve the performances of a laboratory swirl injector using hydrogen and operating in conditions close to industrial targets. This optimization study combines LES simulations as high-fidelity model with 2D RANS simulations as low-fidelity. • A multifidelity and multi-objective optimization is performed for an H 2 -powered laboratory injector. • The operating point is representative of the cruise conditions of a SMR aircraft. • Large-eddy simulations are integrated in the optimization approach. • This optimization study is compared to a monofidelity approach and to two single-objective approaches. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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