铝基粉末燃料层流火焰传播速度实验研究

Experimental Investigation on Laminar Flame Speed of Aluminum Based Powder Fuel

关键词:  层流火焰  本生灯  铝粉  燃料  颗粒粒径

Key words:  Laminar flame  Bunsen burner  Aluminum powder  Fuel  Particle size

摘要:

为研究铝基粉末燃料火焰传播特性，设计了气固两相本生灯型层流火焰实验装置，开展了铝基粉末燃料层流火焰传播速度的实验研究；获得了气流流速、颗粒相浓度等因素对空气中铝颗粒层流火焰传播的影响规律，并研究不同级配比例下的铝基粉末燃料的火焰传播性能。研究结果表明：在相同颗粒浓度条件下，提高气流速度会显著增加铝基粉末燃料层流火焰传播速度；在相同气流速度条件下，铝基粉末燃料层流火焰传播速度在铝颗粒浓度接近600g/m³时达到最大值，而当铝颗粒浓度过低时，层流火焰无法稳定传播；此外试验结果还表明，利用小粒径颗粒填充大颗粒间的孔隙，能显著提高铝基粉末燃料层流火焰传播速度。

Abstract:

The Bunsen type gas-solid two-phase experimenter for laminar flame was designed and applied to investigate the flame spreading characteristics of aluminum based powder fuel. The experimental investigations were proposed to illustrate the laminar flame speed for aluminum based powder fuel. Both the variations of the laminar flame speed influenced by air speed and particle concentration were obtained. Furthermore， the flame spreading characteristics of the aluminum based powder fuel with different grading ratios were also investigated. The results show that the increasing in air speed deeply improves the laminar flame speed of aluminum based powder fuel in the same particle concentration condition. However， the laminar flame speed of aluminum based powder fuel reaches the maximum while the particle concentration nearly equaling to 600g/m³ in the same air speed condition. Further more， the spreading process of laminar flame can not keep stable while the particle concentration is too low. The further results also show that flame spreading performance of the aluminum based powder fuel can be significantly improved through filling the gap between large aluminum particles by small aluminum particle appropriately.