Initiation of chain and thermal explosions by the reactor surface. Criterion for the participation of branching chains in a thermal explosion

被引：8

作者：

Aleksandrov, E. N. ^{[1
]}

Kuznetsov, N. M. ^{[1
]}

Kozlov, S. N. ^{[1
]}

机构：

[1] Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119991, Russia

来源：

COMBUSTION EXPLOSION AND SHOCK WAVES | 2007年 / 43卷 / 05期

基金：

俄罗斯基础研究基金会;

关键词：

chain explosion; thermal explosion; chain branching; atoms; radicals; third ignition limit; criterion for the participation of branching chains in processes;

D O I：

10.1007/s10573-007-0071-9

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The combustion of hydrogen and silane is studied. It is established that the chain initiation reaction on quartz in the zone of hydrogen and silane combustion is manifested as an autocatalytic reaction which is able to initiate a chain explosion and participate in the initiation of a thermal explosion. It is shown that in the case of an oxyhydrogen gas, the assumption of a branching-chain nature of the third limit is inconsistent with Semenov's law, which includes double exponential dependences of the chain reaction rate on time and temperature. A criterion for the participation of branching chains in complex processes is proposed based on the presence or absence of short delays of a thermal explosion (approximate to 1 sec). According to the criterion, the explosion of an oxyhydrogen gas at atmospheric pressure with delays markedly exceeding 1 sec proceeds without the participation of branching chains and is consistently explained by the joint action of autocatalytic processes on the reactor wall and gas-phase processes.

引用

页码：530 / 537

页数：8