Browsing by Author "Pachidis, Vassilios"

Browsing by Author "Pachidis, Vassilios"

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  • Performance and emission assessment of thermo-electric power plant for rotorcraft propulsion 
    Roumeliotis, Ioannis; Arena, Francesco; Liu, Yize; Vouros, Stavros; Pachidis, Vassilios; Broca, Olivier; Toure, Djiby; Unlu, Deniz (American Society of Mechanical Engineers, 2021-01-11)
    This paper assesses a gas turbine based parallel rotorcraft hybrid electric propulsion system in terms of overall performance and emissions. Three different electric power train technology levels and three different power ...
  • Performance and operability of an electrically driven propulsor 
    Eryilmaz, Ibrahim; Li, Huayang; Pachidis, Vassilios; Laskaridis, Panagiotis; Zhu, Zi-Qiang; Jewell, Geraint Wyn (Sage, 2021-12-29)
    This manuscript discusses the operation of an electrically driven fan for a hybrid-electric propulsion system for BAe-146 aircraft. The thrust requirement is fed into an integrated cycle and aerodynamic design tool for the ...
  • Preliminary Design of Hybrid-Electric Propulsion Systems for Emerging Urban Air Mobility Rotorcraft Architecture 
    Saias, Chana Anna; Goulos, Ioannis; Roumeliotis, Ioannis; Pachidis, Vassilios; Bacic, Marko (American Society of Mechanical Engineers, 2021-08-09)
    The increasing demands for air-taxi operations together with the ambitious targets for reduced environmental impact have driven significant interest in alternative rotorcraft architectures and propulsion systems. The design ...
  • Preliminary thermodynamic assessment for advanced-cycle marine gas turbines. 
    Sanchez de Leon, Luis (2014-12)
    Nowadays, around 80% to 90% of the international trade is made by sea, and the vast majority of the large merchant ships are powered by means of low-speed two-stroke diesel engines. Currently, gas turbines have only found ...
  • Propulsion aerodynamics for a novel high-speed exhaust system 
    Tsentis, Spyros; Goulos, Ioannis; Prince, Simon; Pachidis, Vassilios; Zmijanovic, Vladeta (American Society of Mechanical Engineers (ASME), 2023-09-28)
    A key requirement to achieve sustainable high-speed flight and efficiency improvements in space access, lies in the advanced performance of future propulsive architectures. Such concepts often feature high-speed nozzles, ...
  • Propulsion aerodynamics for a novel high-speed exhaust system 
    Tsentis, Spyros; Goulos, Ioannis; Prince, Simon; Pachidis, Vassilios; Zmijanovic, Vladeta (American Society of Mechanical Engineers, 2023-09-13)
    A key requirement to achieve sustainable high-speed flight and efficiency improvements in space access, lies in the advanced performance of future propulsive architectures. Such concepts often feature high-speed nozzles, ...
  • Reverse thrust aerodynamics of ultra-high bypass variable-pitch turbofans. 
    Bentley, David (2018-04)
    This thesis constitutes the first research project into reverse thrust aerodynamics of variable-pitch turbofans within the Cranfield Rolls-Royce UTC in Aero System Design, Integration & Performance. The study focussed on ...
  • Rotorcraft engine maintenance costs analysis based on flight profile and usage. 
    Chrysochoidis, Evangelos (2018-05)
    Rotorcraft cover all sectors of human activity, supporting military, civil and government needs. Their design allows them to: i) deploy at different operating environments, ii) support power-demanding flight profiles, and ...
  • Simulation framework development for helicopter mission analysis 
    Goulos, Ioannis; Mohseni, Martina; Pachidis, Vassilios; D’Ippolito, Roberto; Stevens, Jos (American Society of Mechanical Engineers (ASME), 2010-12-22)
    Helicopter mission performance analysis has always been an important topic for the helicopter industry. This topic is now raising even more interest as aspects related to emissions and noise gain more importance for ...
  • Simulation Framework Development for the Multidisciplinary Optimisation of Rotorcraft 
    Goulos, Ioannis (Cranfield University, 2012)
    The effective and efficient evaluation of conceptual product designs prior to manufacturing of prototypes, is of utmost importance for any industrial ac¬tivity. The rotorcraft industry is no different. Accurate, thorough ...
  • Stochastic axial compressor variable geometry schedule optimisation 
    Gallar, L.; Arias, M.; Pachidis, Vassilios; Singh, R. (Elsevier Science B.V., Amsterdam., 2011-07-01)
    The design of axial compressors is dictated by the maximisation of flow efficiency at on design conditions whereas at part speed the requirement for operation stability prevails. Among other stability aids, 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 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 ...