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Small Icing Wind Tunnel
Horák, V. ; Hoření, Bohumír ; Rozehnal, D. ; Svoboda, E.
The paper deals with a small icing wind tunnel realized at the Department of Aerospace and Rocket Technologies in conjunction with the aircraft icing simulation project. There are presented some results of the airfoil ice accretion prediction and various resulting ice shapes from icing wind tunnel. Appropriate consideration is given to the ice shape geometry measurement either.
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Numerické řešení nárůstu glazového ledu
Hoření, Bohumír ; Horák, V.
The paper presents the main problem of the wing airfoil glaze ice accretion prediction: theoretical solution of the flow of a thin layer on a cold surface and gradual freezing. There are formally arranged the conservative equations using for the solution of water flow in open channels. The flux terms are evaluated using a discontinuous Galerkin method, which could be considered as a generalized finite volumes classical method.
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Modelování klasické námrazy na profilu křídla
Horák, V. ; Hoření, Bohumír
The paper presents the rime ice accretion prediction code. Model includes the calculation of a velocity distribution, droplet motion equations and detetrmination of a water mass flux impacting on the wing airfoil surface. Changing the airfoil shape is illustrated in compare of experimental results.
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Lokální odpory na stěně umístěných překážek
Chára, Zdeněk ; Hoření, Bohumír
The influence of surface mounted obstacles on free level of channel flow is discussed. The obstacles of square cross section are placed sequentially along a hydraulic flume and perpendicularly to the flow direction across the whole channel width. Three various spacing between the obstacles - 5H, 11H and 23H (H is height of the obstacle) were tested for different flow discharges. The surface levels were recorded and the results were compared with numerical simulations. Based on the experimental data and numerical simulations the resistance coefficients of the individual obstacles were determined.
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Numerical simulation of flow in a backward step channel
Hoření, Bohumír ; Chára, Zdeněk
The contribution deals with numerical simulations of flow in a backward step channel of step height 2 cm and channel cross section 2x20 cm. The simulations are performed with help of three turbulent models – k-w SST, standard k-e and Reynolds Stress Model on three different types of grid. The results are compared with experimental observation. The best results were achieved for k-w SST model.
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