![]() Since increasing arc current enhances the heat loss to the anode, torches are being developed to operate under high voltage and low current. To increase the plasma power and electrothermal efficiency, conventional torches are being modified to operate with molecular gases such as air and nitrogen. High power plasma torches with higher electro-thermal efficiency are required for industrial applications. Hiremath, Gavisiddayya Kandasamy, Ramachandran Ganesh, Ravi Numerical simulation of a novel non-transferred arc plasma torch operating with nitrogen These studies will be useful to decide the design criteria for ICP torches required for different material processing applications. The plasma impedance of ICP torch varies with different operating parameters and plays an important role for RF oscillator design and power coupling. The plasma resistance, inductance of the torch, and the heat distribution for various plasma gases have also been investigated. The temperature contours, flow field, axial, and radial velocity profiles were investigated under different operating conditions. The operating parameters varied here are central gas flow, sheath gas flow, RF-power dissipated in plasma, and plasma gas. A two dimensional numerical simulation of RF-ICP torch using argon, nitrogen, oxygen, and air as plasma gas has been investigated using computational fluid dynamic (CFD) software fluent (c). C.Ī numerical study is done to understand the possible operating regimes of RF-ICP torch (3 MHz, 50 kW) using different gases for plasma formation at atmospheric pressure. Ignition of ethylene fuel injected through the centre of a tungsten carbide tube acting as the central electrode is demonstratedĪ comprehensive study of different gases in inductively coupled plasma torch operating at one atmosphere In addition, the present design allows the torch to be operated as both a fuel injector and igniter. The addition of microwave energy enhances the height, volume and enthalpy of the plasma torch when the torch operates at a low airflow rate, and even when the flow speed is supersonic, a noticeable microwave effect on the plasma torch is observed. Operational tests of the device indicate that the microwave power is coupled to the plasma torch and that the arc discharge power is increased. The numerical results indicate that the microwave power coupling efficiency exceeds 80%. A theoretical study of the microwave coupling from the cavity to the plasma torch, as the load, is presented. A cylindrical-shaped plasma torch module is integrated into a tapered rectangular cavity to form a microwave adaptor at one end, which couples the microwave power injected into the cavity from the other end to the arc plasma generated by the torch module. Kuo, S P Bivolaru, Daniel Williams, Skip Carter, Campbell DĪ new plasma torch device which combines arc and microwave discharges to enhance the size and enthalpy of the plasma torch is described. As a practically useful result of this analysis, carried out through this numerical and experimental work, it is suggested that low input current, high gas flow rate and relatively large electrode diameter are more favourable as appropriate operating conditions of the torch for the efficient treatment of hazardous organic wastesĪ microwave-augmented plasma torch module The validity of this method is confirmed by comparison of the calculated and measured net powers. For the numerical modelling of the interior region of the torch, a cold flow analysis is employed along with a simplified balance equation of the Lorentz and gas dynamic drag forces in order to determine a cathode spot position on the cathode surface. From the fact that these criteria successfully describe both the arc voltage and thermal efficiency behaviour of the torch, depending on its operating and geometrical parameters, it is proved that they can be usefully applied to the design and operation of high power torches. The newly modified similarity criteria are derived from the measured data related to torch performances. A plasma torch with a hollow cathode and anode has been designed and fabricated, and the arc voltages and thermal efficiencies are measured from its discharge. The operational features and thermal plasma characteristics of a plasma torch with hollow electrodes are investigated based on their dependence on input current, gas flow rate and electrode diameter when air is used as a plasma gas. International Nuclear Information System (INIS) Operational features and air plasma characteristics of a thermal plasma torch with hollow electrodes
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