Browsing by Author "Christie, Robert"

Browsing by Author "Christie, Robert"

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  • 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 ...
  • Aerodynamics of aero-engine installation 
    Stankowski, Tomasz P.; MacManus, David G.; Sheaf, Christopher T.; Christie, Robert (Sage Publications, 2016-02-24)
    This paper describes current progress in the development of methods to assess aero-engine airframe installation effects. The aerodynamic characteristics of isolated intakes, a typical transonic transport aircraft as well ...
  • An automated approach for the aerodynamic design of close-coupled propulsion/airframe configurations 
    Matesanz García, Jesús; Christie, Robert; Tejero, Fernando; MacManus, David G.; Heidebrecht, Alexander (Council of European Aerospace Societies, 2020-02-28)
    Reducing aircraft emissions is a key element in mitigating the environmental impact of aviation. Within this context, different novel aircraft propulsion configurations have been proposed. A common feature of many of these ...
  • An automated approach to nacelle parameterization using intuitive class shape transformation curves 
    Christie, Robert; Heidebrecht, A.; MacManus, David G. (American Society of Mechanical Engineers (ASME), 2017-01-18)
    A tool to create parametric aerodynamic shapes using intuitive design variables based on class shape transformation (CST) curves is presented. To enable this, a system has been developed which accepts arbitrary constraints ...
  • Coupled propulsive and aerodynamic analysis of an installed ultra-high bypass ratio powerplant at high-speed and high-lift conditions 
    Matesanz García, Jesús Matesanz; MacManus, David G.; Tejero, Fernando; Goulos, Ioannis; Hueso Rebassa, Josep; Swarthout, Avery E.; Christie, Robert (AIAA, 2023-06-08)
    To achieve the targets proposed in the Flightpath 2050 for the aviation industry, more efficient propulsive systems are required. One possible solution is to increase the bypass ratio of the engines to increase the propulsive ...
  • Design and analysis of non-axisymmetric installed aero-engine exhaust systems 
    Otter, John J.; Goulos, Ioannis; Christie, Robert; MacManus, David G. (Elsevier, 2020-09-17)
    In order to increase propulsive efficiency, and hence reduce fuel consumption, future aero-engines are expected to operate with higher bypass ratios and larger fan diameters relative to current in-service engines. As such, ...
  • Effect of unsteady fan-intake interaction on short intake design 
    Boscagli, Luca; MacManus, David G.; Christie, Robert; Sheaf, Christopher T. J. (American Society of Mechanical Engineers, 2023-10-13)
    The next generation of ultra-high bypass ratio civil aero-engines promises notable engine cycle benefits. However, these benefits can be significantly eroded by a possible increase in nacelle weight and drag due to the ...
  • 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 ...
  • Lateral jet interaction with a supersonic crossflow 
    Christie, Robert (Cranfield University, 2010-10)
    A lateral jet in a supersonic crossflow creates a highly complex three-dimensional flow field which is not easily predicted. The aim of this research was to assess the use of a RANS based CFD method to simulate a lateral ...
  • Low order models for transonic afterbody aerodynamic characteristics 
    Zuccolo, Giovanni; Christie, Robert; MacManus, David G.; Goulos, Ioannis; Martin, Peter (AIAA, 2020-01-05)
    A key aspect in the preliminary design of new combat aircraft is the prediction of the afterbody and exhaust system aerodynamic drag. To meet the various operating conditions requirements for a multi-role vehicle the ...
  • Methodology assessment for the design and analysis of aero-engine short intakes 
    Boscagli, Luca; Christie, Robert; MacManus, David G. (CEAS, 2020-02-28)
    A key aspect for the design of an aero-engine intake is that it must operate at off-design conditions such as high incidence. For short intake design the interaction with the fan cannot be neglected. This work establishes ...
  • Nacelle design for ultra-high bypass ratio engines with CFD based optimisation 
    Robinson, Matthew; MacManus, David G.; Christie, Robert; Sheaf, Christopher T.; Grech, Nicholas (Elsevier, 2020-09-09)
    As the size of aero-engines has increased in recent years, the need for slimmer and shorter nacelles has become more pressing. A more aggressive design space must therefore be explored for nacelle designs which are expected ...
  • Non-axisymmetric aero-engine nacelle design by surrogate-based methods 
    Tejero, Fernando; Christie, Robert; MacManus, David G.; Sheaf, Christopher T. (Elsevier, 2021-06-15)
    For many aerodynamic design tasks, a key challenge is the balance between the non-linearity of the transonic flow, the inherent 3D nature of the geometry and flow field, the computational cost and the level of accuracy. ...
  • Parametric design of non-axisymmetric separate-jet aero-engine exhaust systems 
    Otter, John J.; Christie, Robert; Goulos, Ioannis; MacManus, David G.; Grech, Nicholas (Elsevier, 2019-07-16)
    Future civil air vehicles are likely to feature propulsion systems which are more closely integrated with the airframe. For a podded underwing configuration, this close coupling is expected to require non-axisymmetric ...
  • Propulsion system integration and modelling synthesis 
    Christie, Robert (Cranfield University, 2016-07)
    Concerns over fuel costs, along with the ever increasing requirement to reduce the impact of emissions, means that the world's airlines continue to introduce low-noise and more fuel-efficient aircraft into their fleet. ...
  • The use of hybrid intuitive class shape transformation curves in aerodynamic design 
    Christie, Robert; Robinson, Matthew; Tejero, Fernando; MacManus, David G. (Elsevier, 2019-10-23)
    The inherent mathematical smoothness of intuitive class shape transformation (iCST) curves has been shown to be suitable for the design of aerodynamic shapes. However, this property means that any changes to a constraint ...