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Archives of Acoustics
EN Instantaneous acoustic heating of a viscous fluid flow in a boundary layer is the subject of investigation. The governing equation of acoustic heating is derived by means of a special linear combination of conser- vation equations in the differential form, which reduces all acoustic terms in the lin[...]
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Journal of KONES
EN Lubricating oils are characterized by improving quality. It is obtained by additives which are the integral part of the lubricants. Nevertheless, in extreme hard working conditions of the tribological systems (high pressures, velocities and temperatures, temporary lubricating lack during starting) t[...]
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Journal of Theoretical and Applied Mechanics
2007 Vol. 45 nr 3 539-556
PL Artykuł poświęcony jest zagadnieniom modelowania warstwy przyściennej w maszynach przepływowych, w których występują różne mechanizmy przejścia laminarnoturbulentnego, w tym obecne zwłaszcza w warunkach napływających śladów. W artykule przedstawiono przegląd najnowszych osiągnięć w interpretacji prz[...]
EN The paper deals with the problems of boundary layer modelling in turbomachinery applications, where various mechanisms are present, especially under the conditions of upstream wakes. The paper presents a review of recent achievements in interpretation of by-pass, wake induced and separation induced [...]
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Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
1999 nr 115 81--85
EN This paper concerns experimental research using LDV laser anemometry technique developed in Ecole Centrale de Lyon . The research work is relative to separated boundary layer on the pressure side of an impulse turbine blade. The large dimension of the blade (1.4m chord) permits detailed studies of t[...]
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Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
1999 nr 115 91--98
EN The bladerow interactions contain variety of forms related to potential and viscous mechanisms which affect the behaviour of flowfield. All these phenomena exert a distinct influence upon the efficiency and energy losses of flowpath through the blading. Therefore this subject has been a matter of in[...]
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Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
1999 nr 115 107--114
EN The paper considers the effects of wake interaction on the profile loss for plane cascade flows. It was stated that the changes in profile loss have been caused by periodically forcing of the laminar-turbulent transition in a boundary layer. Measurements have been performed with the use of pressure [...]
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Modelowanie Inżynierskie
2012 T. 12, nr 43 177-184
PL Prezentowane badania dotyczą wykrywania a posteriori warstwy brzegowej w analizie numerycznej struktur cienkościennych na przykładzie powłok zdominowanych giętnie. Poprzednie badania dotyczyły płyt. W niniejszej pracy przedstawione będą metody wykrywania a posteriori efektu brzegu w przypadku dwóch [...]
EN The presented research concerns a posteriori detection of boundary layers in the numerical analysis of thin-walled structures. Our previous research dealt with plates. Here we address the case of bending-dominated shells.In this paper we are interested in the a posteriori methods for detecting the e[...]
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Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
PL Artykuł dotyczy eksperymentalnej analizy rozwoju warstwy przyściennej na powierzchni turbinowej łopatki kierowniczej Na wlocie do palisady zainstalowany został wieniec prętów cylindrycznych mający za zadanie symulację warunków przepływowych panujących w rzeczywistym stopniu turbinowym. Zasadniczym z[...]
EN The paper presents an experimental analysis of the boundary layer developing on the surface of blade profile of a stator cascade. At the inlet to the cascade the conditions existing in real stage have been simulated by means of rotating wheel of cylindrical bars. The main aim of this work was to ana[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN The paper presents a new extension of the -Ret model to account for both the laminar-turbulent transition and the surface roughness. The new modeling approach takes into account the pressure gradient, turbulence intensity and roughness height and density. In the transition region both the intermitt[...]
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Acta Geophysica
EN The article reviews past accomplishments and recent advances in conceptual understanding, numerical simulation, and physical interpretation of the wind shear phenomena in the atmospheric convective boundary layer.
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Turbulence : international journal
2002 Vol. 8-9 189-198
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Archives of Thermodynamics
EN In the work presented is a new approach to modelling the bubble flow in a boundary layer. The approach is based on summation of the dissipation energy coming from the shearing turbulent flow in the absence of bubbles and the dissipation contribution from the bubble motion. As a result we obtain the [...]
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Archives of Thermodynamics
EN The heat mass transfer processes were studied in a boundary layer over the porous flat plate using the two-parameter turbulence model. The flows with evaporation of ethyl alcohol, and water and also flows with injection of hydrogen (helium) into the laminar and turbulent outer air flow were calculat[...]
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Applied Mechanics and Engineering
2000 Vol. 5, no 4 923-957
EN A theoretical, high Reynolds number, investigation into the combined influence of surface cooling and curvature on the stability and transition properties of a compressible axisymmetric boundary-layer is presented. Here we consider the boundary-layer flow along a semi-infinite circular cylinder wher[...]
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Applied Mechanics and Engineering
1999 Vol. 4, no 1 113-120
EN A theoretical study is carried out to investigate the steady laminar boundary layer flow due to a rotating frustum of a cone. The effects of the streamwise coordinate and half cone angle on the velocity field and local skin friction coefficient are examined.
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International Journal of Applied Mechanics and Engineering
2004 Vol. 9, no 4 687-699
EN A calculation method for the subsonic and transonic viscous flow over airfoil using the displacement surface concept is described. This modelling technique uses a finite volume method for the time-dependent Euler equations and laminar and turbulent boundary-layer integral methods. Additionally speci[...]
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Journal of KONES
2015 Vol. 22, No. 2 233--239
EN There are problems associated with flight of objects such as rockets after exceeding sound barrier. One of them is heating up their body during the flight, especially at low altitudes. Overheated surface of rocket leads to serious consequences, such as rapid destruction of material components of mis[...]
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Archives of Acoustics
EN The modes of the thermoviscous flow over a strongly non-uniform background have been obtained. Corresponding matrix projecting operators that decompose every mode, or every possible type of the hydrodynamic motion, from the overall field perturbation have been written in the explicit form. Projectin[...]
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Tribologia
2004 nr 1 31-44
PL W artykule opisano doświadczenie, które dodatkowo potwierdziło istnienie warstwy przyściennej w smarach plastycznych na powierzchni ścianki metalowej. Smar plastyczny, zagęszczony mydłem polarnym, który ściskano pomiędzy płytkami miedzianymi zachowywał się inaczej, aniżeli podczas ściskania go pomię[...]
EN The aim of presented paper was experimental confirmation of boundary layer in grease on metalic surface existence. The investiga tions have proved that crease with polar thickener had other beha- vior during compression between copper plates and polipropylene plates. The results of experiments showe[...]
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Machine Dynamics Problems
EN The requirements for brake systems are basically a high and a stable coefficient of friction at a minimum of wear. From the brake manufacturers' point of view, the prediction of performance or noise behaviour of brake systems is necessary to lower the development costs of brake pads. The current dev[...]
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