可燃介质中高温火团诱导的爆炸及其抑制

本文对高温火团诱导的爆炸及惰性颗粒的抑爆过程进行了数值研究.这种带激波的两相化学反应流动,由于各种特征时间的差异,方程具有刚性.本文利用分裂格式处理方程刚性,用全耦合有限体积的TVD格式和Lax-Wendroff-Rubin格式分别求解气相和颗粒相方程.结果表明,仅当火团在其周围形成适当的温度梯度时,才可能导致爆炸,这要求火团初温不能过低或过高.抑爆剂加入时,浓度大于某值才有效,否则,无论多大的抑爆区域皆不能抑制爆炸.本文还对颗粒直径,颗粒密度等对抑爆效果的影响进行了讨论.

EXPLOSION INDUCED BY A HOT REACTIVE GAS POCKET AND ITS SUPPRESSION

The explosion induced by a uniform hot reactive gas pocket and its suppression by inert particles are discussed numerically in this paper A numerical technique is developed to integrate the governing equations based on a non steady two phase reacting flow with very disparate characteristic time It is shown that the transition process from combustion to explosion occurs only for a suitable initial temperature of the hot gas,neither very low nor very high, to establish a temperature gradient in cold reactive mixtures surrounding the hot gas Only if the particle concentration is larger than a critical value,can the shock waves be suppressed completely Otherwise it may become strong again after passing through the dusty flow or will propagate steadily inside it Small and light particles have a stronger effect on explosion suppression than large and heavy ones