Výsledky vyhledávání

Akademický článek

On the Efficiency of a Piezoelectric Energy Harvester under Combined Aeroelastic and Base Excitation

Autor: Antiopi-Malvina Stamatellou, Anestis I. Kalfas

Publikováno v: Micromachines, Vol 12, Iss 8, p 962 (2021)

A flutter-type, nonlinear piezoelectric energy harvester was tested in various combinations of aerodynamic and harmonic base excitation to study its power output and efficiency. The commercial polyvinylidene fluoride film transducer LDT1-028K was use

Externí odkaz: https://doaj.org/article/43e40d39b7ba4c818af5537669d2cefb

Zobrazit plný text záznamu

Akademický článek

A novel 4-sensor fast-response aerodynamic probe for non-isotropic turbulence measurement in turbomachinery flows

Autor: Alexandros C. Chasoglou, Michel Mansour, Anestis I. Kalfas, Reza S. Abhari

Publikováno v: Journal of the Global Power and Propulsion Society, Vol 2, Iss 1 (2018)

In modern computational studies for turbomachinery applications, time, length scales and isotropy of turbulent structures are important for representative modelling. To this end, experimental data are essential to validate the numerical tools. The cu

Externí odkaz: https://doaj.org/article/b5b91fbed5ac43389a70ecc3cdddffaa

Zobrazit plný text záznamu

Akademický článek

Effect of purge air on rotor endwall heat transfer of an axial turbine

Autor: Sebastiano Lazzi Gazzini, Rainer Schädler, Anestis I. Kalfas, Reza S. Abhari, Sebastian Hohenstein, Gregor Schmid, Ewald Lutum

Publikováno v: Journal of the Global Power and Propulsion Society, Vol 1, Iss 1 (2017)

In order to gain in cycle efficiency, turbine inlet temperatures tend to rise, posing the challenge for designers to cool components more effectively. Purge flow injection through the rim seal is regularly used in gas turbines to limit the ingestion

Externí odkaz: https://doaj.org/article/95e2db6b253b4408ad1e89e650693bcd

Zobrazit plný text záznamu

Akademický článek

Novel high-pressure turbine purge control features for increased stage efficiency

Autor: Rainer Schädler, Anestis I. Kalfas, Reza S. Abhari, Gregor Schmid, Tipmann auf dem Kampe, Sanjay B. Prabhu

Publikováno v: Journal of the Global Power and Propulsion Society, Vol 1, Iss 1 (2017)

Rim seals throttle flow and have shown to impact the aerodynamic performance of gas turbines. The results of an experimental investigation of a rim seal exit geometry variation and its impact on the high-pressure turbine flow field are presented. A o

Externí odkaz: https://doaj.org/article/57e9063aca1d4b5c94c60ac1d5f5a316

Zobrazit plný text záznamu

Akademický článek

Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine

Autor: Konstantinos G. Barmpalias, Ndaona Chokani, Anestis I. Kalfas, Reza S. Abhari

Publikováno v: International Journal of Rotating Machinery, Vol 2012 (2012)

A data adaptive spectral analysis method is applied to characterize the unsteady loss generation in the leakage flow of an axial turbine. Unlike conventional spectral analysis, this method adapts a model dataset to the actual data. The method is illu

Externí odkaz: https://doaj.org/article/24d9ebfecc034f82bc1d794b985514d4

Zobrazit plný text záznamu