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Pneumatic Measurements Downstream of a Radial Turbine Nozzle Cascade

Journal of Thermal Science 2010年第1期19卷 42-46页

作者： Martin LUXA rudolf dvorak David SIMURDA Jan VIMMR Department of Fluid Dynamics Institute of Thermomechanicsv.v.i.Academy of Science of the Czech RepublicPragueCzech Republic Department of Mechanics University of West Bohemia in PilsenPlzeňCzech Republic

This paper deals mainly with pneumatic measurements on a radial turbine nozzle cascade. The fill radial cascade guarantees the exit flow field periodicity downstream of it. A special traversing mechanism with a five - hole conical probe moving along a circular path behind the cascade was used for flow field investigation in this type of cascade with very low aspect ratio. The analyses of results of 2D and 3D pneumatic measurements including loss coefficient values are presented.

关键词： radial turbine cascade aspect ratio pneumatic measurement loss coefficient

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Supersonic-Subsonic Transition in Relatively Narrow Channels

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Journal of Thermal Science 2000年第4期9卷 311-315页

作者： rudolf dvorak (Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Prague, The Czech Republic) Institute of Thermomechanics Academy of Sciences of the Czech Republic Prague The Czech Republic

The flow structure in relatively narrow channels has a strong three-dimensional character with complex flow phenomena, including regions of localized separation, various vortical smictures, etc., all of which have to be considered when dealing with the problem of supersonic-subsonic transition. In this paper only the following three problems are considered: 1. the effect of channel width on transition from supersonic to subsonic velocities, 2. transition from supersonic to subsonic velocities in a system of shock waves - pseudoshock wave, 3. transition from subsonic to supersonic velocities in a critical cross section at the end of a duct with fully developed turbulent channel flow. Problems connected with vortical structures and flow separation were discussed by the same author elsewhere (see References).

关键词： internal aerodynamics compressible now channel now shock waves

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Vortices and Vortical Structures in Internal Aerodynamcs

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Journal of Thermal Science 1997年第2期6卷 86-89页

作者： rudolf dvorak (Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Prague, Czech Republic) Institute of Thermomechanics Academy of Sciences of the Czech Republic Prague Czech Republic

The paper aims at summarizing the author’s recent phenomenological study of the orthe, developmeot and identification of vortical structures in internal aerodynamics.A connection between evolution of these structures and flow separation in closed cUrVed channels is also discussed. It has been shown that in real fluids the individual vortex cores very soon lose their identity and merge into a new dissipative structure, the properties of which still have to be defined.

关键词： vortical structures flow separation internal aerodynamics

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