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Arc–Anode Attachment Area in DC Arc Plasma Torch at Low Pressure
Ondáč, Peter; Mašláni, Alan; Hrabovský, Milan
2016 - anglický
Studying the processes in the anode attachment area of a DC arc plasma torch helps to extend the lifetime of the anode, stabilize the plasma flow for plasma spraying and better understand the movement of the anode attachment. In this work, such processes were studied at low pressure, by a non-disturbing method, using a high-speed camera and a high voltage probe. We also found pressure ranges, in which the following transitions were observed: the constricted/diffuse anode attachment, and subsonic/supersonic plasma jet\n
Klíčová slova:
Arc Plasma Torch; Arc–Anode Attachment; Low Pressure
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Arc–Anode Attachment Area in DC Arc Plasma Torch at Low Pressure
Studying the processes in the anode attachment area of a DC arc plasma torch helps to extend the lifetime of the anode, stabilize the plasma flow for plasma spraying and better understand the movement ...
NEOSTEL Fly-Eye Optics Alignment Aid System (AAS) - design
Budasz, Jiří; Lédl, Vít; Pleštil, Jan; Steiger, Kateřina; Steiger, Lukáš; Václavík, Jan; Veselý, Martin; Vít, T.
2016 - anglický
The aim of this document is to describe the design of the Fly-Eye Optics Alignment Aid System.
Klíčová slova:
laser source; Alignment; References; FEM analysis
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
NEOSTEL Fly-Eye Optics Alignment Aid System (AAS) - design
The aim of this document is to describe the design of the Fly-Eye Optics Alignment Aid System.
Infrared measurements in medium and long wavelength on COMPASS
Vondráček, Petr; Horáček, Jan; Pánek, Radomír; Gauthier, E.
2016 - anglický
The experimental study of radial profiles of parallel heat flux in the scrape-off layer (SOL) of the COMPASS tokamak shows a systematic discrepancy between medium (MWIR) and long (LWIR) wavelength infrared (IR) thermographic measurements. Significant temperature and heat flux overestimation is observed in the MWIR range, whilst the LWIR range is almost not affected. It is assumed to be caused by a presence of dust particles creating sub-pixel sized micro hot-spots. Significant inhomogeneity of the surface conditions across the limiter is observed, resulting in local disturbance of the derived heat flux profiles (decay length variation up to ~ few tens of percent). Influence of the inhomogeneously distributed micro hot-spots is suppressed using correction factors (the heat transmission coefficient α) for each pixel separately in the heat flux calculation. Procedure of the α coefficient estimation is described.
Klíčová slova:
IR; MWIR; LWIR; Dust; COMPASS; SOL
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Infrared measurements in medium and long wavelength on COMPASS
The experimental study of radial profiles of parallel heat flux in the scrape-off layer (SOL) of the COMPASS tokamak shows a systematic discrepancy between medium (MWIR) and long (LWIR) wavelength ...
METIS mirror M0 FM
Lédl, Vít; Melich, Radek; Vít, Tomáš
2016 - anglický
Scope of the document is to provide required test results with respect to the structure of M0 mirror, FM version. The mirror has a unique numbering M0-C19-22.
Klíčová slova:
METSI M0 FM mirror
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
METIS mirror M0 FM
Scope of the document is to provide required test results with respect to the structure of M0 mirror, FM version. The mirror has a unique numbering M0-C19-22.
Photocatalytic Decomposition of Wastewater from the Production of Explosives
Brom, Petr; Brožek, Vlastimil; Březina, Václav; Hlína, Michal; Mastný, L.; Novák, M.
2016 - anglický
Water stabilized plasma generator WSP® H-500, operating on the principle of Gerdien arc was used for the photocatalytic decomposition of furazan- and picraminate-based explosives. The generator emits intensive radiation in the range of 300-660 nm, which allows not only to activate photocatalysts based on TiO2, but also other semiconductor oxides with a narrower band gap, such as tungsten oxide. The photocatalytic decomposition of sewage and slurries containing the potassium salt of 4-hydroxy-4,6-dihydro-5,7- dinitrobenzofurazane-3-oxide (KDNBF) or sodium picraminate (NaC6H4N3O5) was performed using the anatase paste and newly developed photocatalyst produced by the company Precheza a.s. The photocatalytic reactor was built using a quartz tube coil with an internal volume of 650 ml, with a nominal size of the irradiated area of 7.5 dm2 (value reduced by the area of the gaps between coil turns) to enable the flow the processing solution or suspension of up to 10 l / min. The centre of the coil is exposed to the plasma jet with the intensity\nof 80 kW; of which 15 kW is transformed into the light radiation. 11% of the radiation output was used for the presented experiments. The time of exposition was 45 mins and 20 l of solution were treated. In the case of KDNBF, 90% of the compound was decomposed. Moreover, 100% of sodium picraminate were decomposed after 15 minutes into low-molecular inorganic compounds. Advantage of the assembly is the ability to treat highly dangerous chemical compounds in a closed cycle and test selective catalyst
Klíčová slova:
plasma generator; photocatalytic decomposition; sodium picraminate; dinitrobenzofurazane
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Photocatalytic Decomposition of Wastewater from the Production of Explosives
Water stabilized plasma generator WSP® H-500, operating on the principle of Gerdien arc was used for the photocatalytic decomposition of furazan- and picraminate-based explosives. The generator emits ...
NEOSTEL Collimator Realization Detailed Optical Design.
Melich, Radek; Steiger, Lukáš; Václavík, Jan; Vít, T.
2016 - anglický
The aim of this document is to describe the optical design of the Alignment Collimator for the NEOSTEL telescope. The document describes proposed optical and mechanical design. It consists of several parts:\n• Optical design and its tolerance analysis\n• Ghost image analysis\n• Stray light analysis\n• Mechanical design and FEM analysis
Klíčová slova:
Alignment Collimator; NEOSTEL; Optical design
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
NEOSTEL Collimator Realization Detailed Optical Design.
The aim of this document is to describe the optical design of the Alignment Collimator for the NEOSTEL telescope. The document describes proposed optical and mechanical design. It consists of several ...
COMPARISON OF S-CO2 POWER CYCLES FOR NUCLEAR ENERGY
Veselý, L.; Dostál, V.; Entler, Slavomír
2016 - anglický
The supercritical carbon dioxide (S-CO2) is a possible cooling system for the new generations of nuclear reactors and fusion reactors. The S-CO2 power cycles have several advantages over other possible coolants such as water and helium. The advantages are the compression work, which is lower than in the case of helium, near the critical point and the S-CO2 is more compact than water and helium. The disadvantage is so called Pinch point which occurs in the regenerative heat exchanger. The pinch point can be eliminated by an arrangement of the cycle or using a mixture of CO2. This paper describes the S-CO2 power cycles for nuclear fission and fusion reactors.
Klíčová slova:
S-CO2; power cycle; fusion
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
COMPARISON OF S-CO2 POWER CYCLES FOR NUCLEAR ENERGY
The supercritical carbon dioxide (S-CO2) is a possible cooling system for the new generations of nuclear reactors and fusion reactors. The S-CO2 power cycles have several advantages over other ...
Measurement of camera spectral response
Melich, Radek; Václavík, Jan; Žídek, Karel
2016 - anglický
Spectral response of the camera will be measured using monochromator in conjunction with an integration sphere. Camera without objective will be placed in one port of the integrating sphere and light beam from monochromator will be fed into perpendicular port. Sensor of the camera sensor will be therefore uniformly illuminated by diffused light from monochromator. Proposed FWHM of the monochromator is 15 nm as a trade-off between light intensity provided by monochromator and deformation of spectral characteristic (Picture XY). Diameter of the integrating sphere has to be larger than 100 mm to ensure uniform illumination over sensor area.
Klíčová slova:
Camera spectral response
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurement of camera spectral response
Spectral response of the camera will be measured using monochromator in conjunction with an integration sphere. Camera without objective will be placed in one port of the integrating sphere and light ...
METIS mirror M0 EQM
Lédl, Vít; Melich, Radek; Vít, Tomáš
2016 - anglický
Scope of the document is to provide required test results with respect to the structure of M0 mirror, EQM version. The mirror has a unique numbering M0-C09-12.
Klíčová slova:
METIS mirror Mé EQM
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
METIS mirror M0 EQM
Scope of the document is to provide required test results with respect to the structure of M0 mirror, EQM version. The mirror has a unique numbering M0-C09-12.
ELECTRON BEAM REMELTING OF PLASMA SPRAYED ALUMINA COATINGS
Matějíček, Jiří; Veverka, J.; Čížek, J.; Kouřil, J.
2016 - anglický
Plasma sprayed alumina coatings find numerous applications in various fields, where they enhance the properties of the base material. Examples include thermal barriers, wear resistance, electrical insulation, and diffusion and corrosion barriers. A typical structure of plasma sprayed coatings, containing a multitude of voids and imperfectly bonded interfaces, gives them unique properties - particularly low thermal conductivity, high strain tolerance, etc. However, for certain applications such as permeation barriers or wear resistance, these voids may be detrimental.\nThis paper reports on the first experiments with remelting of plasma sprayed alumina coatings by electron beam technology, with the purpose of densifying the coatings and thereby eliminating the voids. Throughout the study, several parameters of the e-beam device were varied - beam current, traverse velocity and number of passes. The treated coatings were observed by light and electron microscopy and the thickness, structure and surface morphology of the remelted layer were determined and correlated with the process parameters. Based on the first series of experiments, the e-beam settings leading to dense and smooth remelted layer of sufficient thickness were obtained. In this layer, a change of phase composition and a marked increase in hardness were observed.\n
Klíčová slova:
Plasma sprayed coating; alumina; electron beam; remelting; post-treatment
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
ELECTRON BEAM REMELTING OF PLASMA SPRAYED ALUMINA COATINGS
Plasma sprayed alumina coatings find numerous applications in various fields, where they enhance the properties of the base material. Examples include thermal barriers, wear resistance, electrical ...
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