The Study of the Suction Activated by the End Supply Jet from Plasma Cutting Area

The study of a local suction activated by perpendicular straight-flow jet from plasma cutting areas in the outlet space of the heterogeneous jet has been carried out. The results of the numerical simulation of various options for suction torch activation and experimental studies of the proposed suction apparatus design are presented. Axial velocity values at different air flow rates with the optimal flow rate ratio β are determined for the patented design of the local suction. It is revealed that the absence of negative factors of jets interaction during supply air jet formation in the form of radial air jet is achieved for the activating and removing jets ratio β = 0.8–1. It is also determined that schemes when the values of the flow ratios are β > 1 lead to an increase in the suction range, and the opening angle of the cutting radial air jet is close to 90°. Experimental data obtained by modelling the effects of suction and radially directed limiting flow has been obtained and substantiated. The geometrical parameters of the device at which an improvement in the conditions of the suction flow performance is observed have been obtained.