铝粉尘激波点火的实验研究

介绍了用铝粉氧化反应所生成的中间产物的特征光谱来测量铝粉尘受激波点火延迟的新的测量方法．测量了三种不同形状和粒度的铝粉尘激波点火延迟。由实验证实，当环境温度在Ａｌ２Ｏ３的熔点左右时，铝粒都可以被点火；由于机制的不同，点火延迟相差很大；点火延迟与铝粉颗粒的比表面积和活性铝的含量有关，而与环境的氧含量基本无关；但当氧含量小于１％时，铝粉尘不能被点火。

EXPERIMENTAL STUDY OF SHOCK WAVE IGNITION OF ALUMINUM DUST

The paper describes how to measure the delay of shock wave ignition of alumiaum dust with a new method which makes use of AIO emission spectrum of Aluminum-Oxygen reaction in a shock tube. The delayed times of three kinds of aluminum granule in different shapes and diameters are measured by the method. We have made the conclusions that aluminum dust can be ignited by a shock wave when its temperature behind it is near 2200 K which is near the melting temperature of Al_2O_3,,but the delayed time is rather different due to different of mechanics. By the experiments, we have proved that the delayed time of ignition is not only dependent on the surface-to-mass ratio of aluminum dust,but also on the content of pure aluminum in an aluminum particle. The experiments have indicated that the delayed time of ignition is independent on oxygen concentration down to 1 percent oxygen,ignltion is not observed in pure nitrogen.