3D model of plasma processes in radio frequency inductively coupled plasma torch of 30 kW, 5.28 MHz for powder treatment

Аннотация

The paper presents a 3D stationary model of plasma processes in the radio frequency inductively coupled plasma torch of 30 kW, 5.28 MHz for powder treatment and shows the results of calculations for various flow rates of the plasma­forming gas (air). A short review of existing models has been made. The basic equations of the model are presented. The geometry of the studied plasma torch is shown. The calculation results are presented in the form of plasma temperature and axial velocity distributions in two mutually perpendicular sections. The distributed results of calculations made it possible to obtain integral parameters of the plasma torch, such as the plasma jet power, torch wall power losses, and radiation power losses. The analysis of the received results is carried out.The use of a three­dimensional model made it possible to observe the features of the plasma temperature and velocity distributions that could not be seen within the framework of a two­dimensional axisymmetric model. It can be seen that the plasma is tilted in relation to the axis of the plasma torch. This effect is observed in a cross­section perpendicular to the direction of the inductor ends. This phenomenon can be explained by the spiral shape of the inductor, in which the axisymmetric shape of the electromagnetic field is disturbed