Browsing by Author "Pachidis, Vassilios"

Browsing by Author "Pachidis, Vassilios"

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  • Numerical modeling of core compressor discharge for a windmilling aero engine 
    Ferrer-Vidal, Luis E.; Pachidis, Vassilios (Elsevier, 2020-11-30)
    A gas turbine engine’s ability to relight in flight depends heavily on the combustion chamber’s inlet conditions. These conditions are dictated by the core compression system located immediately upstream of the combustor, ...
  • On the effects of optimal implementation of variable rotor speed and power management on hybrid-electric rotorcraft 
    Saias, Chana Anna; Goulos, Ioannis; Pachidis, Vassilios; Bacic, Marko (American Society of Mechanical Engineers, 2023-02-08)
    The concept of Variable Rotor Speed (VRS) has been recognized as an efficient means to improve rotorcraft operational performance and environmental impact, with electrification being a potential technology to further ...
  • On the flow physics during the transition of a variable pitch fan from nominal operation to reverse thrust mode 
    Vitlaris, Dimitrios; Rajendran, David John; Tunstall, Richard; Whurr, John; Pachidis, Vassilios (American Society of Mechanical Engineers, 2023-12-01)
    The flow field during the transition of variable pitch fans (VPFs) from nominal operation to reverse thrust mode at typical “Approach Idle” engine power setting and aircraft touchdown speed of 140 knots is described in ...
  • On the performance of simulation of inter-stage turbine reheat 
    Pellegrini, Alvise; Nikolaidis, Theoklis; Pachidis, Vassilios; Köhler, Stephan (Elsevier, 2016-10-11)
    Several authors have suggested the implementation of reheat in high By-Pass Ratio (BPR) aero engines, to improve engine performance. In contrast to military afterburning, civil aero engines would aim at reducing Specific ...
  • On the prediction of the reverse flow and rotating stall characteristics of high-speed axial compressors using a three-dimensional through-flow code 
    Righi, Mauro; Pachidis, Vassilios; Könözsy, László Z. (Elsevier, 2019-11-22)
    This paper presents the development of a low-order three-dimensional through-flow code created at Cranfield University in the UK, named ACROSS (Axial Compressor Rotating Stall and Surge simulator), and its application to ...
  • On the use of an inflatable rubber lip to improve the reverse thrust flow field in a variable pitch fan 
    Rajendran, David John; Pachidis, Vassilios (American Society of Mechanical Engineers, 2021-07-29)
    The installed Variable Pitch Fan (VPF) reverse thrust flow field is obtained from the flow solution of an integrated airframe-engine-VPF research model for the complete reverser engagement regime during the aircraft landing ...
  • Optimal control of a compound rotorcraft for engine performance enhancement 
    Scullion, Calum; Vouros, Stavros; Goulos, Ioannis; Nalianda, Devaiah; Pachidis, Vassilios (ASME, 2021-01-11)
    Demands for rotorcraft with increased flight speed, improved operational performance and reduced environmental impact have led to a drive in research and development of alternative concepts. Compound rotorcraft overcome ...
  • Optimal control of a compound rotorcraft for engine performance enhancement 
    Scullion, Calum; Vouros, Stavros; Goulos, Ioannis; Nalianda, Devaiah; Pachidis, Vassilios (ASME, 2020-11-19)
    Demands for rotorcraft with increased flight speed, improved operational performance and reduced environmental impact have led to a drive in research and development of alternative concepts. Compound rotorcraft overcome ...
  • Optimized powerplant configurations for improved rotorcraft operational performance 
    Fakhre, Ali; Tzanidakis, Konstantinos; Goulos, Ioannis; Pachidis, Vassilios; d'Ippolito, Roberto (American Helicopter Society International (AHS), 2015-07-30)
    This paper presents an integrated multidisciplinary rotorcraft design and optimization framework, deployed for the design and assessment of a conceptual rotorcraft powerplant configuration at mission level. The proposed ...
  • An overview of the Rolls-Royce sCO2-test rig project at Cranfield University 
    Anselmi, Eduardo; Bunce, Ian; Pachidis, Vassilios; Zachos, Pavlos; Johnston, Michael (Southwest Research Institute, 2018-04-08)
    An experimental facility is currently under development at Cranfield University, aiming to explore supercritical carbon dioxide as a working fluid for future bottoming power cycle applications for Rolls- Royce. The initial ...
  • 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 ...