Browsing by Author "Zachos, Pavlos K."

Browsing by Author "Zachos, Pavlos K."

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  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Grech, N.; Mehdi, A.; Zachos, Pavlos K.; Pachidis, Vassilios; Singh, R. (2012-06-30)
  • Zachos, Pavlos K.; Grech, N.; Charnley, B.; Pachidis, Vassilios; Singh, R. (2011-03-31)
    The performance prediction of axial flow compressors and turbines still relies on the stationary testing of blade cascades. Most of the blade testing studies are done for operating conditions close to the design point ...
  • 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 ...
  • Zachos, Pavlos K. (Cranfield University, 2010-02)
    Sub-idle is a very challenging operating region, as the performance of a gas tur¬bine engine changes significantly compared to design conditions. In addition, the regulations for new and existing engines are becoming ...
  • 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 ...
  • Brighenti, Giovanni D.; Zachos, Pavlos K.; Orts-Gonzalez, Pau Lluis (Elsevier, 2018-04-11)
    Humid air turbines have previously demonstrated the potential to deliver high efficiency and power output combined with low emissions. This paper investigates the part-load performance of a 40 MW class advanced humid air ...
  • Tanguy, Geoffrey; MacManus, David G.; Zachos, Pavlos K.; Gil-Prieto, Daniel; Garnier, Eric (American Institute of Aeronautics and Astronautics, 2016-08-31)
    The ability of vortex generators (VG) to reduce the unsteady distortion at the exit plane of an S-duct (AIP) is investigated. The 3 components of the velocity at the AIP were measured using a Stereo Particle Velocimetry ...
  • Tanguy, Geoffrey; MacManus, David G.; Zachos, Pavlos K.; Gil-Prieto, Daniel; Garnier, Eric (American Institute of Aeronautics and Astronautics, 2017-05-08)
    The ability of vortex generators to reduce the unsteady distortion at the exit plane of an S duct is investigated. The three components of the velocity at the aerodynamic interface plane were measured using a stereo particle ...
  • Frascella, Michele; Zachos, Pavlos K.; Gil-Prieto, Daniel; MacManus, David G. (American Institute of Aeronautics and Astronautics, 2016-06-30)
    Complex engine intakes are susceptible to unsteady flow distortions that may compromise the propulsion system operability. Hence, the need for high spatial and temporal resolution flow information is essential to aid the ...
  • Zachos, Pavlos K.; Frascella, Michele; MacManus, David; Gil-Prieto, Daniel (AIAA, 2017-06-26)
    Complex engine intakes are susceptible to unsteady flow distortions that may compromise the propulsion system operability. Hence, the need for high spatial and temporal resolution flow information is essential to aid the ...
  • Orts-Gonzalez, Pau Lluis; Zachos, Pavlos K.; Brighenti, Giovanni D. (Elsevier, 2018-03-30)
    The purpose of this paper is to identify the economic potential of a reheated humid air turbine system for power generation applications. A parametric analysis is performed to correlate the technology level of the system ...
  • Gil-Prieto, Daniel; Zachos, Pavlos K.; MacManus, David G.; McLelland, Grant (Elsevier, 2018-10-18)
    The unsteady distorted flow fields generated within convoluted intakes can have a detrimental effect on the stability of an aero-engine. The frequency signature in the distorted flow field is of key importance to the ...