The behavior of detonation waves at concentration gradients
The behavior of detonation waves at concentration gradients
复制标题
DOI：
10.1016/0010-2180(91)90008-y
复制
发表时间：
1991-04
影响因子：
4.4
通讯作者：
G. Thomas;P. Sutton;D. Edwards
中科院分区：
文献类型：
--
作者：
G. Thomas;P. Sutton;D. Edwards
利用两个爆震管研究了浓度梯度下的爆震波传播。每个管的横截面直径分别为22 × 10 mm和50 mm，装有滑阀，垂直安装的管允许通过扩散形成已知的浓度梯度。当爆轰波入射到与惰性气体的突然平面界面上时，峰值透射激波强度与简单的Paterson-Glass模型相当吻合。一个显着的改善被发现在预测值时，津贴泰勒膨胀和能量和动量损失的管壁。在一定条件下，在传输的冲击波后面观察到二次压力脉冲;该脉冲的起源是传输的冲击波和未燃烧气体之间的未反应气体的爆炸。当入射到燃料浓度梯度上时，所传输的爆震波速度和单元格尺寸迅速调整到适合于局部气体成分和壁边界层损失的值。最后，它表明，在较弱的混合物中的爆轰引发的机制，由一个入射的爆轰传播通过浓度梯度在一个重要的方面不同于在一个均匀的混合物中，在形成二次冲击作为一个中间阶段。
Two detonation tubes were used to study detonation propagation in concentration gradients. Each tube, 22 × 10 mm and 50 mm diameter in cross section, respectively, was fitted with slide valves that with the tubes mounted vertically allowed known concentration gradients to form by diffusion. The peak-transmitted shock strength when a detonation is incident on an abrupt planar interface with an inert gas was found to agree reasonably well with the simple Paterson-Glass model. A significant improvement was found in the predicted values when allowance was made for the Taylor expansion and energy and momentum losses to the tube walls. Under certain conditions a secondary pressure pulse was observed behind the transmitted shock; the origin of this pulse is the explosion of the unreacted gas between the transmitted shock and the unburned gas. When incident on gradients of fuel concentration, the transmitted detonation wave velocity and cell size adjusted rapidly, to values appropriate to the local gas composition and wall boundary layer losses. Finally, it was shown that the mechanism of detonation initiation in a weaker mixture by an incident detonation propagated across a concentration gradient differs in one important respect from that in a homogeneous mixture in that a secondary shock is formed as an intermediate stage.