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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
P.C:
310009
E-mail:
meem_contribute@163.com
Abstract: In order to effectively reduce the loss of gas energy of the nozzle, it is necessary to carry out the simulation analysis of the atomization speed and pressure flow field of the overall structure of the pneumatic atomization device, and reduce unnecessary energy loss by improving the local design, so as to improve the utilization rate of gas energy and improve the nozzle atomization performance.Therefore, a numerical study of the internal and external flow fields of the externally-mixed pneumatic atomization device was carried out.Firstly, numerical simulations of the internal gas-phase channel of the device were carried out, and the reasons of the maximum energy loss in the original design were found. Then, according to the pressure and velocity distribution of the flow field, the local structure of the gas-phase channel at the connection between the pot and the nozzle was optimized, and the pressure and velocity changes of the internal and external flow field before and after the optimization of the device were analyzed. Finally, the atomization characteristics of the internal and external flow fields of the original nozzle and the optimized nozzle were compared by simulating the spraying process at different air pressures, and the rationality of the nozzle local structure improvement and the superiority of the performance of the improved pneumatic atomization device were verified. The research results show that, hollowing out the atomizing nozzle body and changing the shape of the atomizing nozzle inlet can effectively improve the throttling of the gas-phase channel and reduce gas energy loss. The improved nozzle gas phase channel inside the highspeed gas path is shortened, and the flow field velocity near the nozzle gasphase outlet increase, the maximum increase is 11.49 %. The improved nozzle atomization performance is improved. When the air pressure near 0.3MPa, the atomization effect is the best.
Key words: pneumatic atomizing device; atomization performance of nozzles; atomization speed; pressure flow field; throttling phenomenon; structural improvement; gas channel
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