Modes of mild ignition in shock tubes: Origins and classification

被引:15
作者
Kiverin, Alexey D. [1 ]
Minaev, Kirill O. [1 ]
Yakovenko, Ivan S. [1 ]
机构
[1] Russian Acad Sci, Joint Inst High Temp, Izhorskaya St 13 Bd 2, Moscow 125412, Russia
关键词
Shock tube; Ignition; Mild ignition; Temperature non-uniformity; Boundary layer; Flow development; HYDROGEN-AIR MIXTURES; DELAY TIMES; DETONATION; MECHANISM; WAVE; WEAK; TEMPERATURES; TRANSITION;
D O I
10.1016/j.combustflame.2020.08.013
中图分类号
O414.1 [热力学];
学科分类号
摘要
The paper analyses numerically the scenarios of ignition kernels formation in the shock tube in the intermediate temperature range. Three modes of mild ignition are distinguished among which are: ignition related to the shear heating in the developed boundary layer, ignition due to the shear heating in the re-circulation zone behind the reflected shock and ignition in the central region of the tube due to the axial compression. All three modes define short ignition delays at low temperatures compared to the ideal shock-tube values. Moreover, it is shown that the gas-dynamic mechanisms responsible for additional local heating of the test mixture provide close rates of heating. As a result, all the data on ignition delays fall in a certain range defined by the mixture composition and pressure, independent on the particular mode of mild ignition. (C) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码:420 / 428
页数:9
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