Coaxial local exhaust device

Purpose of research. For the geometric parameters of the device obtained as a result of studies, which improve the conditions for the formation of the suction flow. and the proposed design solutions of an exhaust device for local ventilation systems to remove harmful emissions during plasma metalworking, which make it possible to improve working conditions and perform industrial tests of the device sample.

Methods. Numerical modeling was performed to obtain a spatial representation of the current lines and velocity fields. Physical modeling methods were used to obtain dependencies that formulate methods for calculating the aerodynamic and ecological-energy parameters of the resulting flow during the interaction of the flow, the resulting hazards with the suction flow and the radial limiting ramjet.

Results. Confirmation of theoretical studies of the design of a local exhaust device with a limiter diffuser designed to form a limiting radial jet and experimental studies on tests of an industrial sample of a local exhaust device of the proposed design have been obtained.

Conclusion. The recommended local coaxial exhaust device of the proposed design can significantly improve the microclimate parameters at stationary plasma cutting sites for a wide range of machines for automated processing of various metals during plasma cutting of metals. Based on experimental and theoretical studies of a coaxial exhaust device, which implements the principle of removing hazards from the plane below the workpiece being processed, limited by a radially directed distributing flow, axial velocity values for various air flow rates with an optimal ratio of suction and limiting flows β for the patented design of a local exhaust device were obtained for the first time.

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