Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Valeriu DRĂGAN"'
Publikováno v:
Aerospace, Vol 11, Iss 11, p 946 (2024)
Turbomachinery shock wave patterns occur as a natural result of operating at off-design points and are accountable for some of the loss in performance. In some cases, shock wave–boundary layer (SW-BLIs) interactions may even lead to map restriction
Externí odkaz:
https://doaj.org/article/6325c56e3b054f089e264510da28f96f
Publikováno v:
Inventions, Vol 9, Iss 5, p 110 (2024)
To alleviate the shock boundary layer interaction adverse effects, various active or passive flow control strategies have been investigated in the literature. This research sheds light on the behavior of perforated plates as passive flow control tech
Externí odkaz:
https://doaj.org/article/8ac2c35974614c60a3c870e328a48964
Autor:
Mihnea Gall, Valeriu Drăgan, Oana Dumitrescu, Emilia Georgiana Prisăcariu, Mihaela Raluca Condruz, Alexandru Paraschiv, Valentin Petrescu, Mihai Vlăduț
Publikováno v:
Journal of Manufacturing and Materials Processing, Vol 8, Iss 5, p 201 (2024)
Understanding shock wave behavior in supersonic flow environments is critical for optimizing the aerodynamic performance of turbomachinery components. This study introduces a novel transonic linear cascade design, focusing on advanced blade manufactu
Externí odkaz:
https://doaj.org/article/b9588ddfe7c240c7b47c5be675e48be9
Publikováno v:
Inventions, Vol 9, Iss 3, p 54 (2024)
This study presents a numerical approach to the design and optimization of centrifugal impellers used in the pumps of active thermal control systems of spacecraft. Although launch costs have shrunk in the last decade, the performance requirements, su
Externí odkaz:
https://doaj.org/article/c23cc71d4a964dca9687e6f162ff8aec
Publikováno v:
Inventions, Vol 9, Iss 2, p 28 (2024)
This research investigated a passive flow control technique to mitigate the adverse effects of shock wave–boundary layer interaction on a NACA 0012 airfoil. A perforated plate with a strategically positioned cavity beneath the shock wave anchoring
Externí odkaz:
https://doaj.org/article/9c58b01e7c89477f88312308770a01eb
Publikováno v:
Applied Sciences, Vol 13, Iss 19, p 11029 (2023)
This paper presents the development of high-specific-speed mixed flow/centrifugal compressor vaned diffusers. Specifically, the design of a test rig that will make the visualization of shock waves on diffuser vanes manageable is addressed in the curr
Externí odkaz:
https://doaj.org/article/731ecba96a4a4d25b1173df4d68ef82a
Autor:
Oana Dumitrescu, Valeriu Drăgan, Bogdan Gherman, Daniel Olaru, Nicolae Macrișoiu, Răzvan Nicoară
Publikováno v:
Journal of Marine Science and Engineering, Vol 11, Iss 2, p 304 (2023)
This paper describes the effort of designing an unconventional exhaust manifold for a marine gas turbine engine, with an integrated passive ventilation port for cooling the engine housing. The study is part of a larger program to substitute the propu
Externí odkaz:
https://doaj.org/article/ba3106435bcc4bd0b293bc52f87f913f
Autor:
Valeriu DRĂGAN
Publikováno v:
INCAS Bulletin, Vol 5, Iss 2, Pp 19-24 (2013)
The paper addresses the issue of thin jets subjected to the Coandă effect and in particular the boundary layer modeling. An existing semi-empirical Coandă effect mathematical model is modified, with a more complex boundary layer model, in order to
Externí odkaz:
https://doaj.org/article/85d1fd2bb1534959aed88c4ac18a8920
Autor:
Valeriu DRĂGAN
Publikováno v:
INCAS Bulletin, Vol 4, Iss 4, Pp 85-92 (2012)
This paper addresses the problem of obtaining a set of mathematical equations that can accurately describe the velocity flow field near a cylindrical surface influenced by the Coandă effect. The work is relevant since the current state of the art Re
Externí odkaz:
https://doaj.org/article/cdbf1b68255f4d8f9463b6e8385c1d77