金属粉末燃烧装置凝相产物反弹特性实验研究

Experimental Study on Rebound Characteristics of Condensed Products in Metal Powder Combustion Device

关键词:  金属粉末燃烧装置  铁粉燃烧产物  反弹系数  石墨板  实验研究

Key words:  Metal powder combustion device  Iron powder combustion products  Rebound coefficient  Graphite plate  Experimental study

摘要:

为获得金属粉末燃烧装置燃烧产物的反弹特性，进而为金属凝相燃烧产物收集装置的设计提供指导，在收集并分析了铁粉燃烧产物特性的基础上，搭建了壁面碰撞反弹装置，开展了凝相燃烧产物与石墨板反弹特性实验研究，获得了法向反弹系数（e_n）与切向反弹系数（e_t）随粒子入射速度、入射角度的影响规律，并拟合了反弹系数多项式。结果表明：真实燃烧产物实验条件下，铁粉凝相燃烧产物的入射速度对e_n和e_t影响不显著，但入射角度对e_n和e_t的影响较大，表现为e_n随入射角度的增加而增大，e_t随入射角度的增加先减后增，但增幅较小，当入射角度大于58°时，e_t又出现减小的趋势。

Abstract:

In order to study the rebound characteristic of combustion products in metal powder combustion device， and provide guidance for the design of metal condensed combustion product collection device， on the basis of collecting and analyzing the characteristics of combustion products of iron powder， a wall impact rebound device was built. The rebound characteristics experiment of condensed combustion products and graphite plates was carried out. The effects of incident velocity and incident angle on the normal rebound coefficient （e_n） and the tangential rebound coefficient （e_t） were obtained. Meanwhile， the rebound coefficient polynomial was fitted. The experimental results show that under the realistic combustor conditions in this paper， the incident velocity of metal condensed combustion product has no significant influence on e_n and e_t， while incident angle has significant influence on the rebound coefficients. With the increase of incident angle， e_n increases， e_t decreases initially and increases afterwards. However， the added value of e_t is small， and e_t decreases again when the incident angle is greater than 58°.