Browsing by Author "Pachidis, Vassilios"

Browsing by Author "Pachidis, Vassilios"

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  • Achieving rotorcraft noise and emissions reduction for 'Clean Sky' - The measurement of success 
    Smith, Chrissy; Pachidis, Vassilios; Castillo Pardo, Alejandro; Gires, Ezanee; Stevens, Jos; Thevenot, Laurent; d'Ippolito, Roberto (2015-12-31)
    This paper describes the work done and strong interaction between Cranfield University as member of the Technology Evaluator (TE) team , Green Rotorcraft (GRC) Integrated Technology Demonstrator (ITD) ...
  • Aeroacoustic simulation of rotorcraft propulsion systems. 
    Vouros, Stavros (Cranfield UniversitySATM, 2019-11)
    Rotorcraft constitute air vehicles with unique capabilities, including vertical take- off and landing, hover and forward/backward/lateral flight. The efficiency of rotorcraft operations is expected to improve rapidly, ...
  • Aerodynamic performance of an un-located high-pressure turbine rotor 
    Pawsey, Lucas; Rajendran, David John; Pachidis, Vassilios (Cambridge University Press, 2017-07-13)
    The rotor sub-assembly of the high-pressure turbine of a modern turbofan engine is typically free to move downstream because of the force imbalance acting on the disc and blades following an un-located shaft failure. This ...
  • Aeroelastic simulation of rotorcraft propulsion systems 
    Castillo Pardo, Alejandro (2017)
    A close relationship between the aerospace technology level and the capability to model and simulate the physics involved during the flight has been identified throughout the aviation history. The continuous improvement ...
  • Analytical modeling of rotating stall and surge 
    Zoppellari, Serena (Cranfield University, 2014-03)
    The life and performance of axial compressors are limited by the occurrence of instabilities such as rotating stall and surge. Indeed, in the course of the design phase a great effort is usually devoted to guarantee an ...
  • Assessment of engine operability and overall performance for parallel hybrid electric propulsion systems for a single-aisle aircraft 
    Kang, Sangkeun; Roumeliotis, Ioannis; Zhang, Jinning; Broca, Olivier; Pachidis, Vassilios (American Society of Mechanical Engineers, 2022-01-04)
    This paper aims to assess the gas turbine operability and overall hybrid electric propulsion system (HEPS) performance for a parallel configuration applied to a 150 passenger single-aisle aircraft. Two arrangements are ...
  • Assessment of engine operability and overall performance for parallel hybrid electric propulsion systems for a single-aisle aircraft 
    Kang, Sangkeun; Roumeliotis, Ioannis; Zhang, Jinning; Pachidis, Vassilios; Broca, Olivier (American Society of Mechanical Engineers, 2021-09-16)
    This paper aims to assess the gas turbine operability and overall hybrid electric propulsion system performance for a parallel configuration applied to a 150 passenger single-aisle aircraft. Two arrangements are considered: ...
  • Assessment of hydrogen fuel for rotorcraft applications 
    Saias, Chana Anna; Roumeliotis, Ioannis; Goulos, Ioannis; Pachidis, Vassilios; Bacic, Marko (Elsevier, 2022-09-19)
    This paper presents the application of a multidisciplinary approach for the preliminary design and evaluation of the potential improvements in performance and environmental impact through the utilization of compressed ...
  • Assessment of hydrogen gas turbine-fuel cell powerplant for rotorcraft 
    Baena Mejıas, Rafael; Saias, Chana Anna; Roumeliotis, Ioannis; Pachidis, Vassilios; Bacic, Marko (Elsevier, 2023-12-11)
    Conventional turboshaft engines are high power density movers suffering from low efficiency at part power operation and producing significant emissions. This paper presents a design exploration and feasibility assessment ...
  • Assessment of the effect of environmental conditions on rotorcraft pollutant emissions at mission level 
    Ortiz-Carretero, Jesús; Castillo Pardo, Alejandro; Pachidis, Vassilios; Goulos, Ioannis (American Society of Mechanical Engineers, 2017-08-17)
    It is anticipated that the contribution of rotorcraft activities to the environmental impact of civil aviation will increase in the forthcoming future. Due to their versatility and robustness, helicopters are often operated ...
  • Assessment of the performance boundaries of very low specific thrust direct-drive turbofan engines at aircraft level for EIS 2025 
    Kissoon, Sajal; Zhang, Fan; Mourouzidis, Christos; Roumeliotis, Ioannis; Pachidis, Vassilios (GPPS Chania20, 2020-09-07)
    Within the past decade, concerns over the environmental impact of civil aviation have pushed the research community towards the development of more efficient propulsion technology, which delivers a lower carbon and NOx ...
  • Assessment of thermo-electric power plants for rotorcraft application 
    Roumeliotis, Ioannis; Mourouzidis, Christos; Zafferetti, Mirko; Deniz, Unlu; Broca, Olivier; Pachidis, Vassilios (ASME, 2019-10-01)
    This paper assesses a parallel electric hybrid propulsion system utilizing simple and recuperated cycle gas turbine configurations. An adapted engine model capable to reproduce a turboshaft engine steady state and transient ...
  • Body-force and mean-line models for the generation of axial compressor sub-idle characteristics 
    Righi, Mauro; Ferrer-Vidal, Espana-Heredia Luis; Pachidis, Vassilios (Cambridge University Press, 2020-07-07)
    This paper describes the application of low-order models to the prediction of the steady performance of axial compressors at sub-idle conditions. An Euler body-force method employing sub-idle performance correlations is ...
  • Characterisation of turbine behaviour for an engine overspeed prediction model 
    Pawsey, Lucas; Rajendran, David John; Pachidis, Vassilios (Elsevier, 2017-11-28)
    This paper focuses on the characterisation of turbine overspeed behaviour to be integrated into an engine overspeed model capable of predicting the terminal speed of the high pressure turbine (HPT) in the event of a high ...
  • A characteristic-based 1D axial compressor model for stall and surge simulations 
    Kissoon, Sajal; Righi, Mauro; Pawsey, Lucas; Pachidis, Vassilios; Tunstall, Richard; Roumeliotis, Ioannis (American Society of Mechanical Engineers (ASME), 2023-09-09)
    A low-order unsteady one-dimensional axial compressor and combustor model has been developed at Cranfield University as part of a larger unsteady gas turbine engine model, with the ability to simulate compressor stall and ...
  • Characterization of axial compressor performance at locked rotor and torque-free windmill conditions 
    Ferrer-Vidal, Luis E.; Iglesias-Pérez, Alejandro; Pachidis, Vassilios (Elsevier, 2020-04-28)
    Prediction of aero-engine performance in the sub-idle regime is becoming increasingly important. Performance prediction tools rely on component maps to enable system-level simulations. Methods to obtain compressor sub-idle ...
  • Comparative assessment of fouling scenarios in an axial flow compressor 
    Templalexis, Ioannis; Pachidis, Vassilios; Azamar, Hasani (American Society of Mechanical Engineers, 2020-12-05)
    It is commonly accepted that fouling degrades severely axial compressor performance. Deposits build up as operating hours sum up, causing a decrease in the compressor's delivery pressure, efficiency and flow capacity. ...
  • Comparative assessment of fouling scenarios in an axial flow compressor (Conf) 
    Templalexis, Ioannis; Pachidis, Vassilios; Hasani, Azamar (American Society of Mechanical Engineers, 2021-01-11)
    It is commonly accepted that fouling degrades severely axial compressor performance. Deposits build up throughout the compressor’s operating life, causing a decrease in its delivery pressure, efficiency and flow capacity. ...
  • Considerations on axial compressor bleed for sub-idle performance models 
    Roig Tió, Ferran; Ferrer-Vidal, Luis E.; Azamar Aguirre, Hasani; Pachidis, Vassilios (American Society of Mechanical Engineers, 2021-01-11)
    The trend towards increased bypass ratio and reduced core size in civil aero-engines puts a strain on ground-start and relight capability, prompting renewed interest in sub-idle performance modelling. While a number of ...
  • Control of flow separation in a high-speed compressor cascade through acoustic excitation 
    Coskun, Seyfettin; Rajendran, David John; Pachidis, Vassilios; Bacic, Marko (AIAA, 2023-06-08)
    The use of acoustic excitation for controlling flow separation in a NACA65-K48 linear compressor cascade operating at aircraft engine representative Ma = 0.67 and chord-based Re = 560,000 is investigated numerically. ...