A Design Method for Alloy Melt Atomizer with Supersonic Laval Nozzle Structure
A Laval nozzle and design method technology, applied in design optimization/simulation, computer-aided design, instruments, etc., can solve the problems of insufficient system depth, less research on the flow field of supersonic nozzle atomization nozzle, etc., and achieve reduction The effect of energy loss, reduction of shock wave and turbulence, and improvement of efficiency
Active Publication Date: 2020-05-12
UNIV OF SCI & TECH BEIJING
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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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[0034] The simulation calculation found that when the atomization pressure is 1.7MPa, the gas does not expand after spraying when the atomization pressure is low, and when the atomization pressure increases to 3.2MPa, only a small expansion occurs after the gas exits. The increase of the atomizing gas pressure makes the velocity of the flow field gradually increase, and the maximum velocity increases from 615m / s to 674m / s, but the structure of the flow field is basically similar. Unlike ordinary gas nozzles, the Laval nozzle atomizer does not appear the so-called "closed vortex structure" when the pressure is increased. This is due to the special contraction-expansion structure of the Laval tube. The gas has been fully expanded and accelerated in the tube. The high-speed gas is ejected tangentially along the outlet, and no periodic expansion-compression waves are formed. When the atomization pressure is low, the static pressure in the recirculation area changes little and rema...
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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...
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IPC IPC(8): B22F9/08G06F30/23G06F30/17G06F119/14
CPCB22F9/082B22F2009/088G06F30/17G06F30/23G06F2119/06Y02T90/00
Inventor 周香林徐良辉李景昊胡云飞祁航
Owner UNIV OF SCI & TECH BEIJING
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