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Civil Aircraft Aero-thermo-propulsive Performance Assessment by an Exergy Analysis of High-fidelity CFD-RANS Flow Solutions

Abstract : A new exergy-based formulation is derived for the assessment of the aerothermopropulsive performance of civil aircraft. The choice of exergy is motivated by its ability to provide a well-established and consistent framework for the design of aerospace vehicles. The output of the derivation process is an exergy balance between the exergy supplied by a propulsion system or by heat transfer, the mechanical equilibrium of the aircraft, and the exergy outflow and destruction within the control volume. The theoretical formulation is subsequently numerically implemented in a Fortran code named ffx for the post-processing of CFD-RANS flow solutions. Unpowered airframe configurations are examined with grid refinement studies and a turbulence model sensitivity analysis is performed. A numerical correction is introduced and calibrated to obtain an accuracy similar to the near-field drag method. The code is thereby validated against well-tried methods of drag prediction and wind-tunnel tests, when available. The investigation of powered configurations demonstrates the ability of the approach for assessing the performance of configurations with aerothermopropulsive interactions. First, the formulation is validated for the simple case of a turbojet engine for which consistent figures of merit are exhibited. The method is also proved robust for assessing the overall performance of a boundary layer ingesting propulsion system placed on the upper surface of a simplified blended wing-body architecture. Moreover, this configuration enables the investigation of thermopropulsive interactions by the transfer of heat upstream of the propulsion system. Subsequently, the integration of a heat exchanger on a commercial aircraft is examined for which the exergy point of view provides guidelines for an efficient design. The ability of the formulation to consistently assess all these types of subsystems is a clear benefit of this method.
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Submitted on : Wednesday, February 4, 2015 - 2:40:36 PM
Last modification on : Thursday, October 28, 2021 - 3:16:37 PM
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  • HAL Id : tel-01113135, version 1



A. Arntz. Civil Aircraft Aero-thermo-propulsive Performance Assessment by an Exergy Analysis of High-fidelity CFD-RANS Flow Solutions. Fluids mechanics [physics.class-ph]. Université de Lille 1, 2014. English. ⟨tel-01113135⟩



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