Browsing by Author "MacManus, David"

Browsing by Author "MacManus, David"

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  • Aerodynamic design of separate-jet exhausts for future civil aero-engines, Part II: design space exploration, surrogate modeling, and optimization 
    Goulos, Ioannis; Otter, John; Stankowski, Tomaz; MacManus, David; Grech, Nicholas; Sheaf, Christopher (American Society of Mechanical Engineers, 2016-03-15)
    The aerodynamic performance of the bypass exhaust system is key to the success of future civil turbofan engines. This is due to current design trends in civil aviation dictating continuous improvement in propulsive efficiency ...
  • Aerodynamics of a short intake in crosswind 
    Boscagli, Luca; Christie, Robert; MacManus, David; Piovesan, Tommaso (Elsevier, 2022-09-05)
    The next generation of turbofan aero-engines are likely to have an increase in fan diameter to reduce the specific thrust and increase the overall propulsive efficiency. More compact nacelles with possibly shorter intakes ...
  • Characteristics of shock-induced boundary-layer separation on nacelles under windmilling diversion conditions 
    Boscagli, Luca; MacManus, David; Tejero, Fernando; Sabnis, Kshitij; Babinsky, H.; Sheaf, Christopher T. (AIAA, 2023-11-02)
    The boundary layer on the external cowl of an aeroengine nacelle under windmilling diversion conditions is subjected to a notable adverse pressure gradient due to the interaction with a near-normal shock wave. Within the ...
  • Characterization of unsteady distortion events for S-duct intakes under non-uniform inlet conditions 
    Migliorini, Matteo; Zachos, Pavlos K.; MacManus, David (AIAA, 2023-01-19)
    The use of convoluted intakes is expected to grow in novel aircraft configurations as designers seek to integrate more closely the propulsion system with the airframe. Previous research highlighted considerable unsteady ...
  • A comparative assessment of multi-objective optimisation methodologies for aero-engine nacelles 
    Swarthout, Avery; MacManus, David; Tejero, Fernando; Matesanz García, Jesús; Boscagli, Luca; Sheaf, Christopher T. (ICAS, 2022-09-09)
    There are significant environmental and economic drivers for the development of more fuel-efficient commercial aircraft engines. The propulsive efficiency benefits of ultra-high bypass ratio turbofans may be counteracted ...
  • Deep-learning for flow-field prediction of 3D non-axisymmetric aero-engine nacelles 
    Tejero, Fernando; MacManus, David; Matesanz García, Jesús; Boscagli, Luca; Hueso Rebassa, Josep; Sheaf, Christopher T. (AIAA, 2023-06-08)
    Computational fluid dynamics (CFD) methods have been widely used for the design and optimisation of complex non-linear systems. Within this context, the overall process can typically have a large computational overhead. ...
  • Deep-learning methods for non-linear transonic flow-field prediction 
    Sureshbabu, Sanjeeth; Tejero, Fernando; Sánchez Moreno, Francisco; MacManus, David; Sheaf, Christopher T. (AIAA, 2023-05-08)
    It is envisaged that the next generation of ultra-high bypass ratio engines will use compact aero-engine nacelles. The design and optimisation process of these new configurations have been typically driven by numerical ...
  • Design and optimisation of a Mach 2.5 wind tunnel nozzle 
    Moreno, Miguel; Migliorini, Matteo; Zachos, Pavlos K.; Haslam, Anthony; MacManus, David (AIAA, 2023-01-19)
    The paper presents a methodology for the numerical design and optimization of a distortion-free two-dimensional Mach 2.5 nozzle based on a parametric model. The non-uniformities generated at the Mach wave reflections ...
  • Design of a high-speed intake distortion simulator for propulsion integration research 
    Migliorini, Matteo; Szymanski, Artur; Zachos, Pavlos K.; MacManus, David; Martin, Peter G. (AIAA, 2023-01-19)
    High levels of inlet flow distortion can be a critical aspect in supersonic air induction systems due to the complex spatial nature and notable temporal unsteadiness. This can affect the operability and performance of the ...
  • Design optimisation of non-axisymmetric exhausts for installed civil aero-engines 
    Hueso Rebassa, Josep; MacManus, David; Tejero, Fernando; Goulos, Ioannis; Sánchez-Moreno, F.; Sheaf, Christopher T. (Elsevier, 2023-10-31)
    Future civil aero-engines are likely to operate with higher bypass-ratios (BPR) than current power-plants to improve propulsive efficiency and reduce specific thrust. This will probably be accompanied by an increase of fan ...
  • Fan-intake aerodynamic interactions under crosswind conditions 
    Boscagli, Luca; MacManus, David; Christie, Robert (European Turbomachinery Society, 2023-04-28)
    The aerodynamics of an aero-engine intake under off-design conditions is characterized by a range of steady and unsteady mechanisms that can adversely affect the fan operability. A hierarchical computational fluid dynamics ...
  • Heat exchanger integration with an aero-engine bypass duct 
    Bajimaya, Raul; MacManus, David; Abdessemed, Chawki; Goulos, Ioannis; Matesanz García, Jesús; Sheaf, Christopher; Kyritsis, Vasileios (Council of European Aerospace Societies (CEAS), 2023-07-13)
    The development of aero engines with geared fans may require the use of a heat exchanger system embedded within the bypass duct to dissipate heat due to the losses within the power gearbox of the fan. It is pertinent that ...
  • High-resolution turbofan intake flow characterization by automated stereoscopic-PIV in an industrial wind tunnel environment 
    Kempaiah, Kushal U.; Piovesan, Tommaso; Zachos, Pavlos K.; Michaelis, Dirk; Gebbink, Roy; van Rooijen, Bart; Prieto, Daniel Gil; MacManus, David; Sciacchitano, Andrea; Sheaf, Christopher (IOP Publishing, 2023-11-30)
    Unsteady inlet flow distortion can influence the stability and performance of any propulsion system, in particular for more novel, short and slim intakes of future aero-engine configurations. As such, the requirement for ...
  • Impact of installation on the performance of an aero-engine exhaust at wind-milling flow conditions 
    Goulos, Ioannis; MacManus, David; Hueso Rebassa, Josep; Tejero, Fernando; Au, Andy; Sheaf, Christopher (American Society of Mechanical Engineers, 2024-02-01)
    This paper presents a numerical investigation of the effect of wing integration on the aerodynamic behavior of a typical large civil aero-engine exhaust system at wind-milling flow conditions. The work is based on the dual ...
  • Optimization of installed compact and robust nacelles using surrogate models 
    Sanchez Moreno, Francisco; MacManus, David; Hueso Rebassa, Josep; Tejero, Fernando; Sheaf, Christopher T. (ICAS, 2022)
    The design and optimization of aero-engine nacelles in a configuration installed on the airframe may be an important consideration to realize the cycle benefits of new ultra-high bypass ratio aero-engines. However, this is ...
  • Propulsion integration study of civil aero-engine nacelles 
    Tejero, Fernando; MacManus, David; Goulos, Ioannis; Sheaf, Christopher T. (Cambridge University Press, 2023-06-13)
    It is envisaged that future civil aero-engines will operate with ultra-high bypass ratios to reduce the specific fuel consumption. To achieve the expected benefits from the new engine cycles, these new powerplants may mount ...
  • Towards the design and optimisation of future compact aero-engines: intake/fancowl trade-off investigation 
    Tejero, Fernando; MacManus, David; Matesanz García, Jesús; Swarthout, Avery; Sheaf, Christopher T. (Emerald, 2022-12-09)
    Purpose Relative to in-service aero-engines, the bypass ratio of future civil architectures may increase further. If traditional design rules are applied to these new configurations and the housing components are scaled, ...
  • Transonic nacelle design for future medium range aero-engines 
    Schreiner, B. Deneys J.; MacManus, David; Tejero, Fernando; Sánchez Moreno, Francisco; Sheaf, Christopher T. (ICAS, 2022-09-09)
    It is expected that future civil aero-engines will operate at low specific thrust and high-bypass ratios to improve propulsive efficiency. This may result in an increment in fan diameter and associated weight and nacelle ...
  • A wind tunnel rig to study the external fan cowl separation experienced by compact nacelles in windmilling scenarios 
    Sabnis, Kshitij; Babinsky, Holger; Boscagli, Luca; Swarthout, Avery; Tejero, Fernando; MacManus, David; Sheaf, Christopher T. (AIAA, 2023-01-19)
    Ultra high-bypass ratio aircraft engines adopt slim fan cowl profiles which are sensitive to separation on their external surfaces under diversion windmilling conditions, when engine shutdown occurs during cruise. A ...