Browsing by Author "Pachidis, Vassilios"

Browsing by Author "Pachidis, Vassilios"

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  • Three-dimensional low-order surge model for high-speed axial compressors 
    Righi, Mauro; Pachidis, Vassilios; Könözsy, László Z.; Zhao, Fanzhou; Vahdati, Mehdi (Global Power and Propulsion Society, 2020-07-21)
    Surge in modern aero-engines can lead to violent disruption of the flow, damage to the blade structures and eventually engine shutdown. Knowledge of unsteady performance and loading during surge is crucial for compressor ...
  • Three-dimensional low-order surge model for high-speed axial compressors 
    Righi, Mauro; Pachidis, Vassilios; Könözsy, László Z.; Zhao, Fanzhou; Vahdati, Mehdi (Global Power & Propulsion Society, 2020-12-18)
    Surge in modern aero-engines can lead to violent disruption of the flow, damage to the blade structures and eventually engine shutdown. Knowledge of unsteady performance and loading during surge is crucial for compressor ...
  • Three-dimensional through-flow modelling of axial compressor rotating stall and surge. 
    Righi, Mauro (2018-01)
    The operation of an aero-engine is limited by the occurrence of compressor stall, and compressor performance is sacrificed to maintain a sufficient margin of operation. Compressor stall also plays an important part in the ...
  • Three-dimensional through-flow modelling of axial flow compressor rotating stall and surge 
    Righi, Mauro; Pachidis, Vassilios; Könözsy, László Z.; Pawsey, Lucas (Elsevier, 2018-04-17)
    This paper presents a three-dimensional through-flow approach based on the cylindrical Euler equations incorporating a body force method. Blade performance is captured through a mixture of empirical correlations and a novel ...
  • Three-spool turbofan pass-off test data analysis using an optimization-based diagnostic technique 
    Saias, Chana Anna; Pellegrini, Alvise; Brown, Stephen; Pachidis, Vassilios (Sage, 2021-04-15)
    Production engine pass-off testing is a compulsory technique adopted to ensure that each engine meets the required performance criteria before entering into service. Gas turbine performance analysis greatly supports this ...
  • Tightly-wound vortex and self-generated intake distortion effects on turbomachinery performance 
    di Cugno, Domenico (2013-07)
    Current developments of civil and military applications may require the installation of aero-engines embedded into the aircraft structure. Consequently, complex diffusing Sducts are necessary to convey air from the intake ...
  • Turbine thermomechanical modelling during excessive axial movement and overspeed 
    Eryilmaz, Ibrahim; Pachidis, Vassilios (Cambridge University Press, 2019-03-14)
    This manuscript discusses the numerical (finite element) and analytical modelling of structural interactions between gas turbine components in case of excessive axial movement and overspeed. Excessive axial movement, which ...
  • Update of the sCO2-test rig at Cranfield University 
    Anselmi, Eduardo; Belleoud, Pierre; Roumeliotis, Ioannis; Pachidis, Vassilios (American Society of Mechanical Engineers, 2022-10-28)
    Since 2018, there is an experimental supercritical carbon dioxide (sCO2) facility operating at Cranfield University. The purpose of this rig is to enable the exploration of supercritical carbon dioxide as a working fluid ...
  • Wind tunnel installation effects on the base flow for a high-speed exhaust system 
    Tsentis, Spyros; Goulos, Ioannis; Prince, Simon; Pachidis, Vassilios; Zmijanovic, Vladeta; Saavedra, Josè (AIAA, 2024-01-04)
    It is envisaged that future propulsion concepts will enable high-speed flight and improve space access. However, their aerodynamic behavior is not yet well understood, especially at the base where severe flow separation ...