|
|
Modelování směšování plazmatu vodní páry s parní atmosférou v tepelném plazmovém reaktoru
Hirka, Ivan ; Jeništa, Jiří ; Hrabovský, Milan
Two-dimensional CFD modelling of mixing of steam plasma jet with steam atmosphere in thermal plasma reactor has been carried out. Temperature of steam plasma is approximately 15 000 K and temperature of steam atmosphere is 400 K. Standard, RNG, and realizable k-e models were used for all simulations. Steam plasma and steam atmospheric properties were generated by the ADEP code. Results for temperature, velocity and density distributions are discussed and presented as images obtained from the FLUENT code, for currently used reactor geometry setup and plasma flow.
|
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
Porovnání vlastností obloukových výbojů s hybridní a vodní vírovou stabilizovací
Jeništa, Jiří ; Bartlová, M. ; Aubrecht, V.
The paper deals with numerical modeling of the plasma torch electric arcs with water vortex stabilization and combined stabilization of arc by argon flow and water vortex. The axisymmetric model includes the arc discharge area between the near-cathode region and the outlet nozzle of the plasma torch. Thermal, electrical and fluid-dynamic characteristics as well as power losses of such arc has been studied for the range of currents 150-500 A. It was proved that addition of argon increases the plasma velocity but does not influence substantially the plasma temperature. The energy losses transferred radially from the arc by conduction and radiation range from 65 to 30 % of the input power. The amount of reabsorbed radiation, calculated by the partial characteristics method, divided to the total divergence of radiation flux is 35-26 % for hybrid torch and 25-16 % for water torch. The calculated velocities and temperatures show good agreement with experiments.
|
guest ::
RSS feed.