Numerical modeling of core compressor discharge for a windmilling aero engine

Ferrer-Vidal, Luis E.; Pachidis, Vassilios

doi:10.1016/j.ast.2020.106365

Cited by 9 publications

(1 citation statement)

References 19 publications

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“…The existing literature is predominantly focused on midcruise conditions [12,23,24,26], with the exception of the work of Rao et al [13], which tackled the idledescent phase. With regard to wind-milling conditions, recent studies focused on nacelle drag [16], internal drag [9], and fan stage aerodynamics [27][28][29][30]. To the authors' knowledge there are currently no published works that quantify the impact of the installed suppression effect on exhaust performance at windmilling.…”

Section: Introductionmentioning

confidence: 99%

Impact of Installation on the Performance of an Aero-Engine Exhaust at Wind-Milling Flow Conditions

Goulos,

MacManus,

Rebassa

et al. 2024

Journal of Engineering for Gas Turbines and Power

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This paper presents a numerical investigation of the effect of wing integration on the aerodynamic behaviour of a typical large civil aero-engine exhaust system at wind-milling flow conditions. The work is based on the Dual Stream Jet Propulsion (DSJP) test rig, as will be tested within the Transonic Wind Tunnel (TWT) located at the Aircraft Research Association (ARA) in the UK. The DSJP rig was designed to measure the impact of the installed pressure field due to the effect of the wing on the aerodynamic performance of separate-jet exhausts. The rig is equipped with the Dual Separate Flow Reference Nozzle (DSFRN), installed under a swept wing. Computational fluid dynamic simulations were carried out for representative ranges of fan and core nozzle pressure ratios for “engine-out” wind-milling scenarios at End of Runway (EOR) take-off, diversion, and cruise conditions. Analyses were done for both isolated and installed configurations to quantify the impact of the installed pressure field on the fan and core nozzle discharge coefficients. The impact of fan and core nozzle pressure ratios, as well as free-stream Mach number and high-lift surfaces on the installed suppression effect were also evaluated. It is shown that the installed pressure field can reduce the fan nozzle discharge coefficient by up to 16%, relative to the isolated configuration for EOR wind-milling conditions. The results were used to inform the design and set-up of the experimental activity which is planned for 2023.

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Section: Introductionmentioning

confidence: 99%

Impact of Installation on the Performance of an Aero-Engine Exhaust at Wind-Milling Flow Conditions

Goulos,

MacManus,

Rebassa

et al. 2024

Journal of Engineering for Gas Turbines and Power

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A Numerical Study of Aero Engine Sub-idle Operation: From a Realistic Representation of Spray Injection to Detailed Chemistry LES-CMC

Okraschevski

Mesquita

Koch

et al. 2023

Flow Turbulence Combust

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High altitude relight is a matter of increasing importance for aero engine manufacturers, in which combustion plays literally a vital role. In this paper we want to evaluate the predictive capability of a combined Smoothed Particle Hydrodynamics (SPH) and Large Eddy Simulation with Conditional Moment Closure (LES-CMC) approach for a spray combustion process at these extreme conditions. The focus is on the SPH modelling of the kerosene primary atomization, the extraction of realistic spray boundary conditions for LES-CMC and the effect of the spray on combustion. Interestingly, it will be demonstrated that the fragment size distributions resulting from the airblast atomization are characterized by bimodal behaviour during the relight process and that small and large fragments differ significantly in their dynamical behavior. This is shown to affect the combustion in the Central Recirculation Zone (CRZ). Very large fragments are even able to supersede the flame from the CRZ, such that endothermic pyrolysis becomes dominant, but simultaneously essential to sustain and stabilize the remaining flame with reactive pyrolysis species. The study proves the ability of our methodology for extreme operating conditions, in which experimental insights are hardly possible.

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Performance and flow evolution of windmilling utilizing a combination of semi-empirical speed and CFD models during mode transition of the wide-chord fan

Zhang

Chen

Jin

et al. 2022

Aerospace Science and Technology

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Numerical modeling of core compressor discharge for a windmilling aero engine

Cited by 9 publications

References 19 publications

Impact of Installation on the Performance of an Aero-Engine Exhaust at Wind-Milling Flow Conditions

Impact of Installation on the Performance of an Aero-Engine Exhaust at Wind-Milling Flow Conditions

A Numerical Study of Aero Engine Sub-idle Operation: From a Realistic Representation of Spray Injection to Detailed Chemistry LES-CMC

Performance and flow evolution of windmilling utilizing a combination of semi-empirical speed and CFD models during mode transition of the wide-chord fan

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