Multi-disciplinary optimization of variable rotor speed and active blade twist rotorcraft: Trade-off between noise and emissions

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dc.contributor.authorPolyzos, Nikolaos D.
dc.contributor.authorVouros, Stavros
dc.contributor.authorGoulos, Ioannis
dc.contributor.authorPachidis, Vassilios
dc.date.accessioned2020-11-19T17:57:06Z
dc.date.available2020-11-19T17:57:06Z
dc.date.issued2020-11-17
dc.description.abstractThe concepts of variable rotor speed and active blade twist are emerging technologies for the next generation of civil rotorcraft. Previous research has focused on the optimum implementation of these technologies for improved fuel economy and environmental impact. Within this work, an integrated approach is deployed to quantify the concurrent reductions in rotor noise and NOx emissions. A relaxation-based free-wake inflow model, coupled with unsteady blade aerodynamics modeling, resolves the flow-field around the main rotor. Aero-acoustic predictions are performed through an acoustic-analogy-based formulation. Gaseous emissions are then predicted via stirred-reactor modeling, coupled with zero-dimensional engine performance analysis method. This strategy is incorporated into a multi-disciplinary genetic algorithm optimization process based on surrogate modeling. Optimal schedules of combined variable rotor speed and active blade twist controls are derived for a twin-engine light helicopter in descent. The accrued schedules suggest NOx reductions between 6% and 21%, simultaneously with source-noise reductions of the order of 2–8 dB, relative to the non-morphing rotor case. The developed strategy constitutes an enabling methodology for the holistic and multi-disciplinary assessment of morphing helicopter rotor configurations.en_UK
dc.identifier.citationPolyzos ND, Vouros S, Goulos I, Pachidis V. (2020) Multi-disciplinary optimization of variable rotor speed and active blade twist rotorcraft: Trade-off between noise and emissions. Aerospace Science and Technology, Volume 107, December 2020, Article number 106356en_UK
dc.identifier.issn1270-9638
dc.identifier.urihttps://doi.org/10.1016/j.ast.2020.106356
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16018
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectHelicoptersen_UK
dc.subjectAerodynamicsen_UK
dc.subjectAeroacousticsen_UK
dc.subjectGas turbinesen_UK
dc.subjectMulti-disciplinary optimizationen_UK
dc.subjectEnvironmental impacten_UK
dc.titleMulti-disciplinary optimization of variable rotor speed and active blade twist rotorcraft: Trade-off between noise and emissionsen_UK
dc.typeArticleen_UK

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