What is it about?
The paper describes the influence of key design parameters on the cruise performance of a UHBPR nacelle at different thrust settings. Using CFD simulations and a fully parametric geometric model, the effect of nacelle cowl length, thickness, highlight and trailing edge radii is investigated in a design of experiment first. The design space is then refined through a genetic algorithm multi-objective optimisation to minimise the drag coefficient.
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Photo by Emiel Molenaar on Unsplash
Why is it important?
Engines with increasing bypass ratio are a short-term target to reach improved efficiency propulsion system. The nacelle design of these larger size turbofan is more critical, due to the relative higher system drag and the enhance interference effect. By examining the role of both global and local design parameters, we provide a set of starting variables for the aerodynamic design.
Perspectives
The axisymmetric study reported in the paper provides useful and meaningful information about the nacelle aerodynamics, but it is not conclusive, in that the real propulsive performance must be evaluated in the fully 3D installed configuration. For this reason, we will focus the future work towards analysing in specific the installation effect and how to achieve optimal system performance.
Andrea Magrini
Universita degli Studi di Padova
Read the Original
This page is a summary of: Ultra-high bypass nacelle geometry design space exploration, January 2021, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2021-0990.
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