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Magnesium alloy protection gas flow field simulation and Control System Research

Author: WangCongCong
Tutor: YingFuQiang
School: Zhejiang University of Technology
Course: Mechanical Design and Theory
Keywords: Magnesium alloy Protective gas Numerical Simulation Porous shunt PLC
CLC: TF822
Type: Master's thesis
Year: 2009
Downloads: 74
Quote: 0
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Abstract


Magnesium and magnesium alloy for its low density, high specific strength, high stiffness, excellent performance has been widely used in aerospace, automobile manufacturing and other fields. Because burning magnesium alloys are susceptible to oxidation, making magnesium alloy gas shielded application of magnesium alloy technology has become one of key technologies. Throughout the magnesium alloy shielding gas research status, mostly concentrated in the protection mechanism, rather on the protection of magnesium alloy furnace gas flow field characteristics and devices based on this research is still immature. This paper studies the protection of magnesium alloy furnace gas flow characteristics, and for the melting process designed to protect the gas control system, research has important theoretical and practical significance. This paper analyzes the protective gas in the flow of magnesium alloy furnace process, the establishment of a magnesium alloy shielding gas furnace mathematical model of turbulent flow, the application of FLUENT computational fluid dynamics software for the numerical simulation. Using the finite volume method to discretize equations, and then use the SIMPLE algorithm, and then analyzes the process parameters (inlet velocity, inlet concentration) and working conditions (temperature of molten magnesium, magnesium liquid height) on the shielding gas flow field. Use TECPLOT software simulation results obtained with the image interpreting evidence, and thus more intuitive demonstration of protective gas in the furnace and the distribution of the flow field and achieving results visualization. The results showed that: the flow rate of protective gas inlet should be controlled in a certain range, if the flow rate is too small, the shielding gas heated floatation buoyancy occurs, if the flow rate is too large, will cause the protective gas over the uneven distribution of the magnesium solution. Adjusting the concentration of the protective gas inlet can effectively regulate the active ingredient in the protective gas above the liquid magnesium content. When conditions change, changing the process parameters can get a good protective effect. For the top of the shielding gas in liquid magnesium uneven distribution is proposed to optimize the use of porous shunt shielding gas flow field. Theoretical analysis and computational fluid dynamics analysis method of combining, obtained porous shunt each orifice flow distribution law for porous shunt improved foundation. Studies show that: by increasing the diameter of the perforated shunt charge, effectively reducing the protective gas in a pressure drop in the shunt, thus improving the perforated shunt orifice flow uniformity. In order to ensure the protection of the gas flow rate stability and good performance, designed to PLC as the core control unit, touch screen human-machine communication platform for the protective gas controlled the overall program. Mass flow controller to control the device, the realization of the concentration of the shielding gas flow and precise control.

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Light metal smelting > Magnesium
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