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Wyszukujesz frazę "Bar, W." wg kryterium: Autor


Wyświetlanie 1-8 z 8
Tytuł:
Design-point, off-design meanline performance analysis and CFD computations of the axial turbine to micro gasturbine engine
Autorzy:
Bar, W.
Czarnecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/245777.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
turbine
gasturbine
axial turbine
micro
CFD
Opis:
Presented paper consists detailed analysis of the turbine to micro gasturbine. Calculatios was made for axial turbine with given mass flow rate m=0.15 [kg/s] and total inlet temperature T3*=950 [K]. The results of Design-Point, Off-Design Meanline Performance analysis and CFD computation are presented. The differences between typical size gasturbine turbines and turbines to micro-gasturbines are highlighted and some guidelines for designers of microgasturbines are given. As a major conclusions for designers of microgasturbines there is a considerations that require to be very carefull and forewarn that typical corelations for commercial gas turbines could't be take it as granted. In particular, compression ratio — solution possibility, micro gasturbine rotor speed,turbine expansion ratio Pi T as a function of compressor and turbine efficiency, efficiency of turbine as a function of reynolds number for constant specific speed coefficient and constant specific diameter coefficient,turbine to micro gasturbine performance map for different normalized rotational speed, 2D and 3D contour plots of entropy, relative Mach number at middle cut of the blade, static pressure at middle cut of the blade are presented in the paper.
Źródło:
Journal of KONES; 2009, 16, 4; 9-16
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multidisciplinary design and optimization of gas turbine engine low pressure turbine at preliminary design stage
Autorzy:
Bar, W.
Orkisz, M.
Moustapha, H.
Powiązania:
https://bibliotekanauki.pl/articles/246241.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
design and optimization
turbomachinery
turbines
Opis:
The gas turbine engine has evolved rapidly during past decades to provide a reliable and efficient business solution for global transportation. The engine design process is clearly a large contributor to this evolution. This process is highly iterative, multidisciplinary and complex in nature. The success of an engine depends on a carefully balanced design that best exploits the interactions between numerous traditional engineering disciplines such as aerodynamics and structures as well as lifecycle analysis of cost, manufacturability, serviceability and supportability. To take into account all of these disciplines and optimization should be used. Currently most of present state-of-art numerical modelling methods, which are used mainly at detailed design stage, are unsuitable for this task due to very high computational time. The solution to this problem can be found in multidisciplinary design and optimization at preliminary design stage with use of simple 1-2D models. This paper presents current aero engine design process and indicates possibilities of future improvements by utilization of proposed methodology, which take into account aerodynamic, thermodynamic and structures (blade, fixing and disc) calculations, connected in one multidisciplinary model, which is suited for optimization. All disciplinary models are presented and described in this paper as well as connection between them, with study over design variable, goal function and constrains that should be used. Moreover, a strategy of optimization is proposed as well as methods for acceleration of optimization process by use of surrogate. The presentation of methodology is followed by example optimization of low-pressure aero engine turbine.
Źródło:
Journal of KONES; 2014, 21, 3; 15-22
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Borowicze.
Autorzy:
Bar, Roman W.
Grafowski, Roman Z.
Rawski, Feliks.
Powiązania:
Biuletyn Informacyjny Światowy Związek Żołnierzy Armii Krajowej. Zarząd Główny, 2004, nr 4, s. 9-15
Data publikacji:
2004
Tematy:
Armia Krajowa żołnierze represje 1944-1945 r. pamiętniki żołnierskie
NKWD (służba bezpieczeństwa) Polska 1944-1945 r. pamiętniki żołnierskie
Obóz stalinowski Borowicze 1944-1947 r. pamiętniki żołnierskie
Obozy stalinowskie Polska 1944-1947 r. pamiętniki żołnierskie
Pamiętniki żołnierskie polskie 1939-1945 r.
Pamiętniki polskie 1944-1989 r.
Opis:
Fot., mapa; Zawiera: Roman Władysław Bar wspomina; Tych mogił nie znajdziecie. Nie znajdzie ich także żadna komisja międzynarodowa / Roman Zdzisław Grafowski; O łagrach Nr 531 za Uralem / Feliks Rawicki.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Technology of Ultrathin NbN and NbTiN Films for Superconducting Photodetectors
Autorzy:
Guziewicz, M.
Slysz, W.
Borysiewicz, M.
Kruszka, R.
Sidor, Z.
Juchniewicz, M.
Golaszewska, K.
Domagala, J.
Rzodkiewicz, W.
Ratajczak, J.
Bar, J.
Wegrzecki, M.
Sobolewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1492719.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.62.Bf
74.78.-w
81.15.Cd
81.15.Jj
Opis:
We report fabrication and characterization of ultrathin NbN and NbTiN films designed for superconducting photodetectors. Our NbN and NbTiN films were deposited on $Al_2O_3$ and Si single-crystal wafers by a high-temperature, reactive magnetron sputtering method and, subsequently, annealed at 1000°C. The best, 18 nm thick NbN films deposited on sapphire exhibited the critical temperature of 15.0 K and the critical current density as high as ≈ 8 × $10^6$ A/$cm^2$ at 4.8 K.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-076-A-079
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrathin NbN Films for Superconducting Single-Photon Detectors
Autorzy:
Słysz, W.
Guziewicz, M.
Borysiewicz, M.
Domagała, J.
Pasternak, I.
Hejduk, K.
Rzodkiewicz, W.
Ratajczak, J.
Bar, J.
Węgrzecki, M.
Grabiec, P.
Grodecki, R.
Węgrzecka, I.
Sobolewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1504147.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.62.Bf
74.78.-w
81.15.Cd
81.15.Jj
Opis:
We present our research on fabrication and structural and transport characterization of ultrathin superconducting NbN layers deposited on both single-crystal $Al_2O_3$ and Si wafers, and $SiO_2$ and $Si_3N_4$ buffer layers grown directly on Si wafers. The thicknesses of our films varied from 6 nm to 50 nm and they were grown using reactive RF magnetron sputtering on substrates maintained at the temperature 850°C. We have performed extensive morphology characterization of our films using the X-ray diffraction method and atomic force microscopy, and related the results to the type of the substrate used for the film deposition. Our transport measurements showed that even the thinnest, 6 nm thick NbN films had the superconducting critical temperature of 10-12 K, which was increased to 14 K for thicker films.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 200-203
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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