微米铝粉在声场中的振荡燃烧特性
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摘要
为了解声场中铝粉的燃烧特性,建立了甲烷平面燃烧器,利用外置喇叭产生振荡,进行了微米级铝粉的燃烧实验。研究了铝粉在不同振荡频率下的分布燃烧响应特性及粒径分别为10、20、30μm的3种铝粉颗粒的燃烧特性和产物的阻尼特性。结果表明,振荡频率不同时,铝粉燃烧对振荡压强的增益作用不同,粒径为20μm铝粉燃烧,在振荡频率200Hz和300Hz时增益作用明显。铝粉粒度越大,分布燃烧增益越大。粒径为10μm铝粉对燃烧器高频振荡阻尼最大。随着铝粉粒度增加,燃烧产物颗粒对高频压强振荡的阻尼减小。
To understand the combustion characteristics of aluminum powders in the sound field,a methane flat burner was established.The combustion experiment of micro-aluminum powders was carried out by an external horn to generate oscillation.The distribution and combustion response characteristics of aluminum powder under different oscillating frequency and the combustion characteristics and damping characteristics of products for aluminum powder with particle size of 10,20,30μm were studied.The results show that when the oscillation frequency changes,the gain effect of the aluminum powder combustion to the oscillating pressure is different,the gain effect of 20μm aluminum powder combustion is obvious when the oscillation frequency is 200 Hz and 300 Hz.The larger the particle size,the greater the gain of distribution combustion.The damping of aluminum powder with the particle size of10μm to high-frequency oscillation of burner is the maximum.With increasing the particle size of aluminum,the damping of combustion product particles on high frequency pressure oscillation reduces.
To understand the combustion characteristics of aluminum powders in the sound field,a methane flat burner was established.The combustion experiment of micro-aluminum powders was carried out by an external horn to generate oscillation.The distribution and combustion response characteristics of aluminum powder under different oscillating frequency and the combustion characteristics and damping characteristics of products for aluminum powder with particle size of 10,20,30μm were studied.The results show that when the oscillation frequency changes,the gain effect of the aluminum powder combustion to the oscillating pressure is different,the gain effect of 20μm aluminum powder combustion is obvious when the oscillation frequency is 200 Hz and 300 Hz.The larger the particle size,the greater the gain of distribution combustion.The damping of aluminum powder with the particle size of10μm to high-frequency oscillation of burner is the maximum.With increasing the particle size of aluminum,the damping of combustion product particles on high frequency pressure oscillation reduces.
引文
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[2]Deshmukh N N,Sharma S D.Suppression of thermoacoustic instability using air injection in horizontal Rijke tube[J].Journal of the Energy Institute,2016.
[3]邓哲,胡春波,杨建刚,等.金属/AP颗粒混合物燃烧特性的光谱分析[J].火炸药学报,2016,39(1):43-47.DENG Zhe,HU Chun-bo,YANG Jian-gang,et al.Analysis on the combustion characteristics of metal/AP mixtures by using emission spectroswpy[J].Chinese Journal of Explosives&Propellants(Huozhayao Xuebao),2016,39(1):43-47.
[4]Blomshield F S,Nguyen S,Matheke H,et al.Acoustic particle damping of propellants containing ultra-fine aluminum[J].AIAA Paper,2004:3722.
[5]Gallier S,Sibe F,Orlandi O.Combustion response of an aluminum droplet burning in air[J].Proceedings of the Combustion Institute,2011,33(2):1949-1956.
[6]Raun R L,Beckstead M W.A numerical model for temperature gradient and particle effects on Rijke burner oscillations[J].Combustion and Flame,1993,94(1/2):1-24.
[7]Brooks K P,Beckstead M W.Dynamics of aluminum combustion[J].Journal of Propulsion and Power,1995,11(4):769-780.
[8]Gallier S,Radenac E,Godfroy F.Thermo acoustic instabilities in solid rocket motors,AIAA2009-5252[R].New York:AIAA,2009.
[9]Gallier S,Godfroy F.Aluminum combustion driven instabilities in solid rocket motors[J].Journal of Propulsion and Power,2009,25(2):509-521.
[10]Hoeijmakers M,Kornilov V,Arteaga I L,et al.Flame dominated thermos acoustic instabilities in a system with high acoustic losses[J].Combustion and Flame,2016,169:209-215.
[11]Sundaram D S,Puri P,Yang V.A general theory of ignition and combustion of nano-and micron-sized aluminum particles[J].Combustion and Flame,2016,169:94-109.
[12]Law C K.Combustion Physics[M].Cambridge:Cambridge University Press,2010.
[13]DeLuca L.Nonsteady burning and combustion stability of solid propellants[R].New York:AIAA,1992.
[14]Leyer J C.Contribution to study of conmbustion instabilities and phenomena of heat transfer to walls in constant volume combustion[J].Revue Cenerale De Thermique,1970,9(98):121.
[15]Temkin S,Dobbins R A.Attenuation and dispersion of sound by particulate-relaxation processes[J].The Journal of the Acoustical Society of America,1966,40(2):317-324.
[16]Beckstead M W.Correlating aluminum burning times[J].Combustion,Explosion and Shock Waves,2005,41(5):533-546.