悬浮铝粉尘爆轰波参数

Parameters of Detonation in Suspended Aluminum Dust

用两相流模型对爆轰波管中的悬浮铝粉尘的爆轰波进行了研究。数值模拟了管径为15.2cm的圆管中平均粒子直径为3.4μm、单位质量表面积为3m2·g-1的铝粉尘中爆轰波的传播和发展,得到了不同浓度时悬浮铝粉尘爆轰波参数,并得到了爆轰极限的下限为当量比=0.25。数值计算给出管径趋于无穷大时不同铝粉尘浓度时爆轰波的参数,得到悬浮铝粉尘爆轰极限的下限为当量比=0.16。数值模拟了当量比为=1、管径不同时爆轰波速度的变化,并得到产生爆轰的临界管径。

Detonation in suspended aluminum dust in tubes was analyzed with two-phase flow model. Development and propagation of aluminum dust detonation with diameter of particle 3.4 μm in detonation tube with inside diameter 15.2 cm was numerically simulated. The differences of velocity and temperature between gas and particles were considered. The dissipation by the convective heat transfer and viscosity through tube wall was taken into account. Velocity of detonation and ignition distance of particles was obtained in suspended aluminum dust with difference concentration of aluminum dust. Also the lower detonation limit was obtained which was equivalence ratio 0.25. Furthermore,detonation velocity in suspended aluminum dust with infinity tube diameter was calculated and lower detonation limit was determined which was 0.16. The detonation parameters of suspended aluminum dust in different tube diameters were obtained with equivalence 1 and critical diameter of tubes was determined.