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O stopě turbulence a tišině
Jonáš, Pavel
The purpose of the contribution is to collect information on the generation, propagation and coalescence of turbulent spots and calmed regions in a transitional boundary layer. The appreciation of the behaviour of both turbulent spot and calmed region under turbulent free stream is the focus of this study.
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Pasivní a aktivní metody řízení mezní vrstvy
Matějka, Milan ; Popelka, Lukáš
The paper deals with influence of the passive and active method of control on the flow field. It is well known fact that boundary layer separation has a fundamental effect on aircraft airfoil performance, compressors and turbines performance and other bodies, subject to study of internal and external aerodynamics. By the boundary layer control, it is possible to obtain both operational economy and extension of efficient operational region. Traditional methods of active boundary layer control are very complex and their application needs complex facilities. Modern methods based on the control by synthetic jets or plasma actuator are simpler, but their design has to be carried out at rather well experience and detailed knowledge about boundary layer and its interaction with the actuator.
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Reference Film Temperature in the Hot-wire Anemometry
Antoš, Pavel
Dimensionless parameters in the cooling law are referred to the reference film temperature. In case of the mean film temperature there is necessary to use a temperature loading factor. There were found such reference temperatures that the loading factor is eliminated.
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