Browsing by Author "Babinsky, Holger"

Browsing by Author "Babinsky, Holger"

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  • Characteristics of shock-induced boundary layer separation on nacelles under windmilling diversion conditions 
    Boscagli, Boscagli; MacManus, David G.; Tejero, Fernando; Sabnis, Kshitij; Babinsky, Holger; Sheaf, Christopher T. (AIAA, 2023-06-08)
    The boundary layer on the external cowl of an aero-engine 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 ...
  • Design of a new test rig to investigate transonic external fan cowl separation 
    Sabnis, Kshitij; Boscagli, Luca; Swarthout, Avery; Babinsky, Holger; MacManus, David; Sheaf, Christopher T. (Association Aeronautique Astronautique de France, 2022-03-28)
    Ultra high-bypass ratio engines, which show considerable promise in reducing the environmental impact of commercial aviation, generally adopt slim fan cowl profiles. These geometries can be more sensitive to separation on ...
  • Design of a quasi-2D rig configuration to assess nacelle aerodynamics under windmilling conditions 
    Boscagli, Luca; Tejero, Fernando; Swarthout, Avery; MacManus, David G.; Sabnis, Kshitij; Babinsky, Holger; Sheaf, Christopher T. (AIAA, 2023-06-08)
    Aero-engine nacelles are typically designed to fulfil both design and off-design aircraft manoeuvres. Under-off design conditions one of the objective is to avoid large flow separation either on the external cowl or within ...
  • Experimental investigation of external fan cowl separation for compact nacelles in windmilling scenarios 
    Sabnis, Kshitij; Boscagl, Luca; Babinsky, Holger; MacManus, David G.; Sheaf, Christopher T. (AIAA, 2023-06-08)
    The slim fan cowl profiles used for ultra-high bypass ratio aircraft engines are designed considering off-design operating conditions, such as engine windmilling during take-off climb out or during cruise. The current paper ...
  • Experimental investigation of transonic external fan cowl separation 
    Sabnis, Kshitij; Boscagli, Luca; Babinsky, Holger; MacManus, David; Sheaf, Christopher T. (Association Aeronautique Astronautique de France, 2023-03-29)
    When a civil aircraft engine is shut down during the cruise phase of flight and thus begins to windmill, a supersonic region forms on the external surface of the fan cowl. The terminating normal shock can separate the ...
  • Flow studies at hypersonic speeds 
    Babinsky, Holger (1991)
    Approximate methods for calculating the surface pressures including the effects of viscous interactionare introduced for laminar and turbulent boundary layers. Experiments were performed with various models taking Schlieren ...
  • A study of roughness in turbulent hypersonic boundary-layers 
    Babinsky, Holger (Cranfield University, 1993-12)
    The influence of large scale regular roughness on a Mach 5 turbulent boundary layer and a compression corner was investigated on axisymmetric wind tunnel models. Three types of roughness were examined; a series of square ...
  • 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 ...