کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10417383 902360 2014 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical simulation on syphonage effect of laval nozzle for low pressure cold spray system
ترجمه فارسی عنوان
شبیه سازی عددی در مورد اثر سیفونگ نازل لیوان برای سیستم اسپری سرد کم فشار
کلمات کلیدی
اسپری سرد کم فشار، اثر سینوژنی، لال نازل، شبیه سازی محاسباتی،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
Instead of injected by high pressure powder feeder, powders can be drawn into the nozzle by syphonage effect generated by supersonic gas flow in low pressure cold spray. This characteristic makes low pressure cold spray conveniently for on-site operation. However, no data have ever been reported on the relationship between the nozzle structures and the gas flow in the powder feeder pipe. In this paper, a CFD software (STAR CCM+) was used to calculate the gas flow in nozzle of the DYMET 413 commercial low pressure cold spray system. Variation of structures and process parameters based on the commercial system were also investigated. The syphonage effect is strongly influenced by the powder feeding location, the temperature and pressure in prechamber has little effect on syphonage effect in powder feeder pipe. The syphonaged gas will decelerate the gas velocity and low down the gas temperature in nozzle, so it is best to control the mass flow rate of powder feeding gas by selecting the location. One of the disadvantages is that the particles will collide with the nozzle wall which makes the nozzle a short service life.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Processing Technology - Volume 214, Issue 11, November 2014, Pages 2497-2504
نویسندگان
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