Numerical simulation of vectoring of arc plasma jet using Coanda effect
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The fluidic thrust vectoring method uses a curved surface and secondary flow to enhance the Coanda effect near the surface. This approach does not require mechanical parts, resulting in a lighter, simpler system with reduced maintenance and repair costs. In the present study, the outflow of a plasma torch controlled by the fluidic thrust vectoring method has been investigated. Numerical simulations were conducted over a 6-second flow period for operating conditions of 50 SLPM flow rate and 500 A electrical current. The fluidic thrust vectoring method was examined for three Coanda surfaces radius, three secondary flow heights, and three gaps between the secondary and primary jets. A 3D numerical simulation of the plasma torch was performed, obtaining velocity, temperature, and other properties at the torch outlet, which were then used as inputs for the final geometry. A two-dimensional solution was carried out to investigate the effects of the Coanda surface and secondary flow on the deflection of the plasma jet. The results demonstrate that increasing the mass flow ratio without considering the geometry leads to an increase in the thrust vector angle, which is also dependent on geometry. Changes in the dimensions can cause either a decrease or increase in the dead zone, thereby delaying the positive jet deflection angle.
