Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Pekka Röyttä"'
Publikováno v:
International Journal of Rotating Machinery, Vol 2009 (2009)
A centrifugal compressor with three different shrouded 2D impellers is studied numerically. All impellers have the same dimensions, and they only differ in channel length and geometry. Noticeable differences in efficiency are observed. Two different
Externí odkaz:
https://doaj.org/article/5e1113b8255c4aeebd40bacdf394e1a8
Publikováno v:
International Journal of Information Systems and Social Change. 7:1-19
Despite of increasing interest in social cognitive research in strategic management during recent years, few studies have examined the relationship between cognitive structures of top management and middle management. This study represents the inform
Publikováno v:
Journal of Non-Newtonian Fluid Mechanics. 229:1-7
A numerical model based on the Fokker-Planck equation for studying the orientation of paper fibers in a suspension is presented. The model is implemented in a finite volume framework. The rotational operators are discretized on a triangulated half sp
Autor:
Pavel Ponomarev, Scott Semken, Maria Polikarpova, Juha Pyrhonen, Yulia Alexandrova, Pekka Röyttä
Publikováno v:
IET Electric Power Applications. 9:523-532
Offshore applications, which call for the largest and most powerful wind turbines, demand a higher standard of reliability and maintainability. Direct-drive permanent-magnet synchronous generators (DD-PMSGs) are increasingly being specified for these
Publikováno v:
Journal of Mechanical Science and Technology. 27:1011-1020
Seven different vaneless diffuser designs for a centrifugal compressor, varying only in diffuser width, were studied experimentally. The studied diffuser widths versus impeller exit width were 1.0, 0.903, 0.854, and 0.806. Three of the narrowed diffu
Publikováno v:
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy. 227:285-294
The increasing demand of energy efficiency and the utilisation of small-scale energy sources require efficient, small and versatile turbines. Supersonic turbines have a high power density and therefore small size and fewer stages than the subsonic on
Publikováno v:
Renewable Energy and Power Quality Journal. :992-997
Publikováno v:
International Journal of Refrigeration. 33:1152-1160
A modern refrigeration process requires constant control to provide required cooling for the user. To properly and economically accommodate this need, a wide operation range of the compressor is necessary. Therefore, it is of interest to investigate
Publikováno v:
International Journal of Refrigeration. 32:1366-1375
The optimisation of a refrigeration process with a two-stage centrifugal compressor and flash intercooler is presented in this paper. The two-stage centrifugal compressor stages are on the same shaft and the electric motor is cooled with the refriger
The drive towards lower emissions in aerospace engines promotes more efficient and physically smaller engines. One way to decrease the size of the axial turbine is to minimize the distance between successive stator and rotor rows. This can usually ha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2c6bae0d91785f0b83f190cf7fb82e4d
http://lutpub.lut.fi/handle/10024/156678
http://lutpub.lut.fi/handle/10024/156678