Browsing Staff publications (SATM) by Author "Zachos, Pavlos K."

Browsing Staff publications (SATM) by Author "Zachos, Pavlos K."

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  • Aerodynamic instabilities in high-speed air intakes and their role in propulsion system integration 
    Philippou, Aristia L.; Zachos, Pavlos K.; MacManus, David G. (MDPI, 2024-01-12)
    High-speed air intakes often exhibit intricate flow patterns, with a specific type of flow instability known as ‘buzz’, characterized by unsteady shock oscillations at the inlet. This paper presents a comprehensive review ...
  • Assessment methods for unsteady flow distortion in aero-engine intakes 
    Gil-Prieto, Daniel; MacManus, David G.; Zachos, Pavlos K.; Bautista, Abian (Elsevier, 2017-10-27)
    Peak events of unsteady total pressure and swirl distortion generated within S-duct intakes can affect the engine stability, even when within acceptable mean distortion levels. Even though the distortion descriptors have ...
  • 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 ...
  • Complex aero-engine intake ducts and dynamic distortion 
    MacManus, David G.; Chiereghin, Nicola; Gil-Prieto, Daniel; Zachos, Pavlos K. (AIAA, 2015-06-19)
    For many embedded and partially-embedded engine systems, the complexity of the flow field associated with convoluted intakes presents an area of notable research challenges. The convolution of the intake duct introduces ...
  • Complex aero-engine intake ducts and dynamic distortion 
    MacManus, David G.; Chiereghin, Nicola; Gil-Prieto, Daniel; Zachos, Pavlos K. (American Institute of Aeronautics and Astronautics, 2017-03-29)
    For many embedded engine systems, the intake duct geometry introduces flow distortion and unsteadiness, which must be understood when designing the turbomachinery components. The aim of this work is to investigate the ...
  • Convoluted intake distortion measurements using stereo particle image velocimetry 
    Gil-Prieto, Daniel; MacManus, David G.; Zachos, Pavlos K.; Tanguy, Geoffrey; Menzies, Kevin R. (2017-04-18)
    The unsteady distorted flowfields generated within convoluted aeroengine intakes can compromise the engine performance and operability. Therefore, there is a need for a better understanding of the complex characteristics ...
  • Delayed detached-eddy simulation and particle image velocimetry investigation of S-Duct flow distortion 
    Gil-Prieto, Daniel; MacManus, David G.; Zachos, Pavlos K.; Tanguy, Geoffrey; Wilson, François; Chiereghin, Nicola (American Institute of Aeronautics and Astronautics, 2017-03-31)
    The dynamic flow distortion generated within convoluted aeroengine intakes can affect the performance and operability of the engine. There is a need for a better understanding of the main flow mechanisms that promote flow ...
  • 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 point performance and optimization of humid air turbine power plants 
    Brighenti, Giovanni D.; Orts-Gonzalez, Pau Lluis; Sanchez-de-Leon, Luis; Zachos, Pavlos K. (2017-04-20)
    With the recent drive towards higher thermal efficiencies and lower emission levels in the power generation market, advanced cycle power plants have become an increasingly appealing option. Among these systems, humid air ...
  • Drag decomposition of a subsonic wing via a far-field, exergy-based method 
    Logothetis, Dimitrios K.; Zachos, Pavlos K.; Rogero, Jean-Michel (SAGE, 2022-10-13)
    This paper focuses on the aerodynamic analysis and drag decomposition of an unpowered, low aspect ratio wing, using a far-field, exergy-based method. As opposed to traditional drag accounting methods, exergy balance provides ...
  • Dynamic flow distortion investigation in an S-duct using DDES and SPIV data 
    Gil-Prieto, Daniel; MacManus, David G.; Zachos, Pavlos K.; Tanguy, Geoffrey; Wilson, Francois; Chiereghin, Nicola (American Institute of Aeronautics and Astronautics, 2016-06-30)
    The dynamic flow distortion generated within convoluted aero-engine intakes can affect the performance and operability of the engine. There is a need for a better understanding of the main flow mechanisms which promote ...
  • Dynamic swirl distortion characteristics in S-shaped diffusers using UCNS3D and time-resolved, stereo PIV methods 
    Piovesan, Tommaso; Migliorini, Matteo; Zachos, Pavlos K.; Tsoutsanis, Panagiotis (AIAA, 2024-01-04)
    Embedded propulsion systems are key enablers of future aircraft configurations with expected benefits in reduced environmental impact and enhanced performance. Such propulsion systems are typically integrated with convoluted, ...
  • Effect of a fan on the unsteady distortion of s-duct intakes 
    Migliorini, Matteo; Zachos, Pavlos K.; MacManus, David G.; Giannouloudis, Alexandros (Association Aeronautique et Astronautique de France (3AF), 2024-04)
    A key requirement for the integration of the propulsion and air induction systems is the assessment of the response of the fan to incoming flow distortion. This is especially crucial for the development of novel aircraft ...
  • Evaluation of extreme value predictions for unsteady flow distortion of aero-engine intakes 
    Migliorini, Matteo; Zachos, Pavlos K.; MacManus, David G. (American Society of Mechanical Engineers (ASME), 2024-02-13)
    Unsteady flow distortion is of interest for the development air-breathing propulsion systems. These stochastic fluctuations can generate incompatibilities between intakes and aero-engines. Observing the extreme flow ...
  • Flow distortion measurements in convoluted aero engine intakes 
    Zachos, Pavlos K.; MacManus, David G.; Chiereghin, Nicola (AIAA, 2015-06-19)
    The unsteady flow fields generated by convoluted aero engine intakes are major sources of instabilities that can compromise the performance of the down stream turbo machinery components. Hence, there exists a need for high ...
  • Flow distortion measurements in convoluted aero engine intakes 
    Zachos, Pavlos K.; MacManus, David G.; Chiereghin, Nicola (American Institute of Aeronautics and Astronautics, 2016-07-07)
    The unsteady flowfields generated by convoluted aero engine intakes are major sources of instabilities that can compromise the performance of the downstream turbomachinery components. Hence, there exists a need for high ...
  • 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 T. (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 ...
  • The impact of heat exchanger degradation on the performance of a humid air turbine system for power generation 
    Orts-Gonzalez, Pau Lluis; Zachos, Pavlos K.; Brighenti, Giovanni D. (Elsevier, 2018-12-13)
    This paper aims to analyse the impact of air-water heat exchanger’s degradation on the performance of a reheated humid air turbine system for power generation applications. A number of thermal models to simulate the ...
  • Influence of upstream total pressure profiles on S-duct intake flow distortion 
    McLelland, Grant; MacManus, David G.; Zachos, Pavlos K.; Gil-Prieto, Daniel; Migliorini, Matteo (AIAA, 2020-04-15)
    For some embedded engine arrangements, the nature of the inlet distortion is influenced by the boundary layer characteristics at the inlet plane of the intake. This research presents the first quantitative assessment on ...

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