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Browsing by Author "Goulos, Ioannis"

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Aerodynamic analysis of civil aeroengine exhaust systems using computational fluid dynamics

Otter, John J.; Goulos, Ioannis; MacManus, David G.; Slaby, Michal (AIAA, 2018-06-25)

As the specific thrust of civil aeroengines reduces, the aerodynamic performance of the exhaust system will become of paramount importance in the drive to reduce engine fuel burn. This paper presents an aerodynamic analysis ...
Aerodynamic design of separate-jet exhausts for future civil aero engines, Part I: parametric geometry definition and CFD approach

Goulos, Ioannis; Stankowski, Tomasz; Otter, John; MacManus, David G.; Grech, Nicholas; Sheaf, Christopher T. (ASME, 2016-03-15)

This paper presents the development of an integrated approach which targets the aerodynamic design of separate-jet exhaust systems for future gas-turbine aero-engines. The proposed framework comprises a series of fundamental ...
Aerodynamic design of separate-jet exhausts for future civil aero-engines, Part II: design space exploration, surrogate modeling, and optimization

Goulos, Ioannis; Otter, John; Stankowski, Tomaz; MacManus, David; Grech, Nicholas; Sheaf, Christopher (American Society of Mechanical Engineers, 2016-03-15)

The aerodynamic performance of the bypass exhaust system is key to the success of future civil turbofan engines. This is due to current design trends in civil aviation dictating continuous improvement in propulsive efficiency ...
Aerodynamic optimisation of civil aero-engine nacelles by dimensionality reduction and multi-fidelity techniques

Tejero, Fernando; MacManus, David G.; Hueso Rebassa, Josep; Sanchez Moreno, Francisco; Goulos, Ioannis; Sheaf, Christopher T. (Emerald, 2022-09-30)

Purpose - Aerodynamic shape optimisation is complex due to the high dimensionality of the problem, the associated non-linearity and its large computational cost. These three aspects have an impact on the overall time of ...
Aerodynamic optimisation of civil aero-engine nacelles by dimensionality reduction and multi-fidelity techniques

Tejero, Fernando; MacManus, David G.; Hueso Rebassa, Josep; Sanchez Moreno, Francisco; Goulos, Ioannis; Sheaf, Christopher T. (Unknown, 2022-03-30)

Aerodynamic shape optimisation is complex due to the high dimensionality of the problem, the associated nonlinearity and its large computational cost. These three aspects have an impact on the overall time of the design ...
Aerodynamics of a compact nacelle at take-off conditions

Swarthout, Avery E.; MacManus, David G.; Tejero, Fernando; Matesanz García, Jesús; Goulos, Ioannis; Boscagli, Luca; Sheaf, Christopher T. (IEEE, 2023-06-08)

Next generation ultra-high bypass ratio turbofans may have larger fan diameters than the previous generation of aircraft engines. This will potentially increase the nacelle diameter and may incur penalties to the weight ...
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 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 ...
Civil turbofan engine exhaust aerodynamics: impact of bypass nozzle after-body design

Goulos, Ioannis; Stankowski, Tomasz; MacManus, David G.; Woodrow, Philip; Sheaf, Christopher T. (Elsevier, 2017-09-11)

It is envisaged that the next generation of civil large turbofan engines will be designed for greater bypass ratios when compared to contemporary architectures. The underlying motivation is to reduce specific thrust and ...
Civil turbofan engine exhaust aerodynamics: impact of fan exit flow characteristics

Goulos, Ioannis; MacManus, David G. (Elsevier, 2019-05-17)

It is envisaged that future civil aero-engines will operate with greater bypass ratios compared to contemporary configurations to lower specific thrust and improve propulsive efficiency. This trend is likely to be accompanied ...
Civil turbofan propulsion aerodynamics: thrust-Drag accounting and impact of engine installation position

Goulos, Ioannis; John Otter, John J.; Tejero, Fernando; Hueso Rebassa, Josep; MacManus, David G. (Elsevier, 2021-01-28)

It is envisaged that the next generation of civil aero-engines will employ high bypass ratios to lower specific thrust and improve propulsive efficiency. This trend is likely to be accompanied with the integration of compact ...
Computational assessment of non-axisymmetric separate-jet exhausts on test rig configurations

Hueso Rebassa, Josep; MacManus, David G.; Goulos, Ioannis (AIAA, 2023-06-08)

The next generation of civil turbofan engines are likely to have increased bypass ratios and lower fan pressure ratios to improve propulsive efficiency and to reduce specific fuel consumption. However, the larger size of ...
Coupled propulsive and aerodynamic analysis of an installed ultra-high bypass ratio powerplant at high-speed and high-lift conditions

Matesanz García, Jesús Matesanz; MacManus, David G.; Tejero, Fernando; Goulos, Ioannis; Hueso Rebassa, Josep; Swarthout, Avery E.; Christie, Robert (AIAA, 2023-06-08)

To achieve the targets proposed in the Flightpath 2050 for the aviation industry, more efficient propulsive systems are required. One possible solution is to increase the bypass ratio of the engines to increase the propulsive ...
Design and analysis of non-axisymmetric installed aero-engine exhaust systems

Otter, John J.; Goulos, Ioannis; Christie, Robert; MacManus, David G. (Elsevier, 2020-09-17)

In order to increase propulsive efficiency, and hence reduce fuel consumption, future aero-engines are expected to operate with higher bypass ratios and larger fan diameters relative to current in-service engines. As such, ...
Design considerations of non-axisymmetric exhausts for large civil aero-engines

Hueso Rebassa, Josep; MacManus, David G.; Goulos, Ioannis; Tejero, Fernando (AIAA, 2023-06-08)

In order to reduce fuel consumption, the next generation of aero-engines are expected to operate with higher bypass ratios and lower fan pressure ratios. This will improve the propulsive efficiency of the power plant and ...
Design exploration and performance assessment of advanced recuperated hybrid-electric UAM rotorcraft

Saias, Chana Anna; Roumeliotis, Ioannis; Goulos, Ioannis; Pachidis, Vassilios; Bacic, Marko (American Society of Mechanical Engineers, 2021-11-09)

The design of efficient, environmentally friendly and quiet powerplant for rotorcraft architectures constitutes a key enabler for Urban Air Mobility application. This work focuses on the development and application of a ...
Design optimisation of non-axisymmetric exhausts for installed civil aero-engines

Hueso Rebassa, Josep; MacManus, David; Tejero, Fernando; Goulos, Ioannis; Sánchez-Moreno, F.; Sheaf, Christopher T. (Elsevier, 2023-10-31)

Future civil aero-engines are likely to operate with higher bypass-ratios (BPR) than current power-plants to improve propulsive efficiency and reduce specific thrust. This will probably be accompanied by an increase of fan ...
Design optimisation of separate-jet exhausts for the next generation of civil aero-engines

Goulos, Ioannis; Otter, John J.; Stankowski, Tomasz; MacManus, David G.; Grech, Nicholas; Sheaf, Christopher T. (ISABE, 2017-09-08)

This paper presents the development and application of a computational framework for the aerodynamic design of separate-jet exhaust systems for Very-High-Bypass-Ratio (VHBR) gas-turbine aero-engines. An analytical approach ...
Design optimisation of separate-jet exhausts with CFD in-the-loop and dimensionality reduction techniques

Hueso-Rebassa, Josep; MacManus, David G.; Tejero, Fernando; Goulos, Ioannis; Abdessemed, Chawki; Sheaf, Christopher (AIAA, 2024-01-04)

For Ultra-High Bypass Ratio aero-engines, the exhaust system is likely to play a significant role on the aerodynamics and performance of the aircraft. For this reason, relatively rapid methods for the aerodynamic design ...
Effects of aircraft integration on compact nacelle aerodynamics

Tejero, Fernando; Goulos, Ioannis; MacManus, David G.; Sheaf, Christopher T. (AIAA, 2020-01-05)

To reduce specific fuel consumption, it is expected that the next generation of aero-engines will operate with higher bypass-ratios, and therefore fan diameters, than current in-service architectures. These new propulsion ...

Browsing by Author "Goulos, Ioannis"

Browsing by Author "Goulos, Ioannis"

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