The microstructures of carbon/carbon composites (C/C) and refractory metal carbide-doped carbon/carbon composites (C/C+MC) were compared to elucidate their ablation mechanism in an arc jet heater.
Discontinuous Cf/Cu composite, with its peculiar properties of high electrical-conductivity, high thermal-conductivity, self-lubricating, resisting electric-arc erosion and so on, is a prospectively functional composite.
Carbon fiber reinforced copper matrix composite, with its excellent properties of high electrical conductivity, high thermal conductivity, self-lubricating, resisting electric-arc erosion and so on, is a promising functional composite.
Let Γ be a smooth compact convex planar curve with arc length dm and let dσ=ψ dm where ψ is a cutoff function.
The circulant digraphDCn(S) is a directed graph with vertex setZn and arc set {(i,i+s): i ∈ Zn, s ∈ S}.
ThenCn(S) is arc-transitive if and only if Xoacts transitively onS.
A packing of the complete directed symmetric graph DKv with m-circuits, denoted by (v,m)-DCP, is defined to be a family of arc-disjoint m-circuits of DKv such that any one arc of DKv occurs in at most one m-circuit.
It is proved that there is no chaotic group actions on any topological space with free arc.
The structure of the front of an arc in a magnetohydrodynamic accelerator
In the second problem the motion of the contour takes place near a cylindrical wall, and it consists of an arc of a circle and a straight segment.
It is shown that an arc burning in a channel with insulated walls is much more stable under these conditions than an arc with the same parameters burning in free space.
Investigation of characteristics of an arc column in laser arc welding using numerical simulation
The effect of transverse magnetic field on the characteristics of an arc in a cylindrical channel
Special characteristics of experimental investigations of the high-temperature flow of gas in units with an electric-arc heater
Three-Dimensional Mathematical Model for the Calculation of Electric-Arc Plasma Flows
It is proposed to develop a three-dimensional mathematical model of electric-arc plasma with due regard for its deviation from thermal and ionization equilibrium.
The combined solution of the equations of electric-arc column and of the thermal problem in electrodes enables one to estimate the effect of the magnetic field of the electrodes on the characteristics of the arc column.
Modeling of the Structure of Plasma Flows in Three-Jet Electric-Arc Reactors
The possible role of certain carrier (Ga2O3, Na,CO3) on the intensity of spectral lines in various matrices such as graphite, U3O8, ZrO2, etc., was investigated. The results
Electric arcs in combustible gas mixtures, as a high temperature source in combustion and plasma technology, have a great deal of advantages in comparison with those in noble gases. In this paper the influence of the mixing ratio, mass flow rates and arc current on the voltage of longitudinally blown arcs in LPG-air mixtures with fixed arc lenth has been studied. In experiments it was observed, that the arc voltage in combustible mixtures is almost 3/2 time of that of pure N2 or air under the same conditions,...
Electric arcs in combustible gas mixtures, as a high temperature source in combustion and plasma technology, have a great deal of advantages in comparison with those in noble gases. In this paper the influence of the mixing ratio, mass flow rates and arc current on the voltage of longitudinally blown arcs in LPG-air mixtures with fixed arc lenth has been studied. In experiments it was observed, that the arc voltage in combustible mixtures is almost 3/2 time of that of pure N2 or air under the same conditions, and that for constant current and mass flow rate as equivalence ratio a increased from 0 to 3, the arc voltage rapidly decreased at first, then almost kept unchanged or slightly increased, and finally fall down to a value corresponding to that of pure air. It was also observed, that on the cathod tip may deposit a stable graphite layer, protecting the cathode from further erosion. In theoretical analysis have been proposed the basic equations of a reacting multicomponent two-demensional axisymmetric MHD flow with arc heating, its three-zone simplified model solution and four-zone model solution. Based on the theoretical analysis, it can be concluded, that the S-shaped relationship of U with a is probably the combined effect of transport properties of gas mixtures and endothermic reactions, which raise the - enthalpy of the gas mixtures to a higher value than that of pure air.
电弧
arc 
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