A Design Method for Alloy Melt Atomizer with Supersonic Laval Nozzle Structure

Abstract

The invention relates to a design method of a supersonic laval nozzle structural alloy melt atomizer, and belongs to the field of alloy powder atomizing preparation. According to the design method, asupersonic laval wall curve is researched, the characteristic of close coupled atomization is combined, the supersonic laval nozzle structural atomizer is designed according to the suction pressure criterion, the close coupled criterion and the flow velocity criterion, and the influence of five main factors including the atomization gas pressure, the atomization gas temperature, the gas nozzle hole heart distance, the gas injection angle and the extended length of a diversion pipe on the flow field structure is simulated and researched by utilizing computational fluid dynamics software. Thus,structural parameters of a nozzle can be optimized, the phenomena of gas backflow and back spray are avoided, the atomizing efficiency is improved, and a guarantee is provided for the production of alloy powder. According to the atomizer, the phenomena of blockage of the diversion pipe, gas back spray and the like of the atomizer can be prevented, shock wave and turbulent flow are reduced, the flying distance of gas can be reduced, the flow velocity can be increased, and the loss of energy is reduced.

Description

technical field [0001] The invention belongs to the technical field of alloy powder atomization preparation, in particular to a design method of an alloy melt atomizer with a supersonic Laval nozzle structure. Background technique [0002] Gas atomization method is an important method for preparing high-performance metal and alloy powders. Compared with traditional grinding and crushing methods and electrochemical methods, it mainly has narrow particle size distribution, high cooling rate, high powder sphericity and low impurity content, etc. Advantages: The gas atomization method has a wide range of applicability, except for refractory metals such as tungsten and molybdenum and very active metals, it is suitable for the preparation of most metals and alloy powders. In recent years, there have been more and more researches on gas atomization, mainly focusing on the structure of atomization flow field, factors affecting powder particle size and melt fragmentation behavior. F...

AI Technical Summary

Problems solved by technology

At present, there are many researches on the flow field of slit nozzles at home and abroad, but there are few researches on the flow field of supersonic nozzle atomizing nozzles, and they are not systematic enough.

The relevant patents are mainly based on the qualitative improvement of nozzle design based on solving specific problems, rather than the quantitative design method of the key structural dimensions of the atomizer nozzle by proposing design criteria and conducting reasonable simulation techniques based on basic principles and problem-oriented

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