Design and Atomization Characteristic of Laval-style Annular Slot Nozzle
Chao-Run Si, Xian-Jie Zhang, Jun-Biao Wang, Yu-Jun Li
(Shannxi Engineering Research Center for Digital Manufacturing Technology, Northwestern Polytechnical University, Xi’an 710072, China)
Abstract:
Gas mass flux rate, metal mass flux rate and outlet gas velocity are three atomization scale parameters which greatly affect the atomization efficiency. A Laval-style annual slot supersonic nozzle is designed by optimizing the geometric parameters of delivery tube outlet and gas outlet to obtain applicable atomization scale parameters. A computational fluid flow model is adopted to investigate the effect of atomization gas pressure (P0) on the gas flow field in gas atomization progress. The numerical results show that the outlet gas velocity of the nozzle is not affected by P0 and the maximum gas velocity reaches 452 m/s. The alternation of aspiration pressure (ΔP) is caused by the variations of stagnation pressure and location of Mach shock disk, and hardly by the location of stagnation point. The aspiration pressure is found to decrease as P0 increases when P0<1.3 MPa. However, at a higher atomization gas pressure increasing P0 causes an opposite: the aspiration pressure atomization increases with the gas pressure, and keeps a plateau when P0>2.0 MPa. The minimum aspiration pressure ΔP=-70 kPa is obtained at P0=1.3 MPa. The results indicate that the designed Laval-style annual slot nozzle has well atomization characteristic at lower atomization pressure.
Key words: spray forming gas atomization laval nozzle annular slot nozzle
DOI：10.11916/j.issn.1005-9113.2013.03.007
Clc Number:TK 263.4
Fund:
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Design and Atomization Characteristic of Laval-style Annular Slot Nozzle
本站小编 哈尔滨工业大学/2019-10-24
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