کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6593746 | 1423546 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Combustion of sonochemically-generated TiâAlâB nanopowders in a premixed methane/air dust flame
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Sonochemically-generated TiâAlâB reactive mixed-metal nanopowders were tested by seeding them into a premixed, fuel-lean (Φâ¯=â¯0.63), methane/air flame to investigate their combustion characteristics. Tests were conducted on powders with and without cryogenic milling. The attenuation of a diode laser beam was measured to calculate the time-resolved concentration of the powder in the flame. Radiant heat flux was measured with three gauges at different heights (1â¯cm, 6â¯cm, and 12â¯cm) along the axis of the flame. Flame spectra were collected to monitor chemiluminescence of intermediate species, and a multi-wavelength pyrometry method was applied to the spectra to calculate the temperature of the hot particulates in the flame. Commercially available metal powders were tested as a benchmark. These included micron-scale aluminum, nano-scale aluminum, micron-scale boron, and inert nano-scale alumina powders. The spectra from flames seeded with the sonochemically-generated TiâAlâB powder show strong chemiluminescence from the BO2, an indicator of boron oxidation. Peak temperatures measured with flame pyrometry were approximately 2100â¯K, which is below the vaporization point of B2O3. The radiant heat flux from the seeded flame increased with concentration faster for the TiâAlâB material than for any of the commercial powders, suggesting a greater gravimetric power density. Based on these results, the TiâAlâB powders show promising combustion and heat-release characteristics, and therefore warrant further examination as a high-performance solid fuel.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 191, May 2018, Pages 187-194
Journal: Combustion and Flame - Volume 191, May 2018, Pages 187-194
نویسندگان
Michael R. Weismiller, Zachary J. Huba, Albert Epshteyn, Brian T. Fisher,