Controlling the form of strong converging shocks by means of disturbances
Controlling the form of strong converging shocks by means of disturbances
复制标题
通过扰动控制强汇聚激波的形式
DOI：
10.1007/s00193-007-0087-9
复制
发表时间：
2007
期刊：
影响因子：
2.2
通讯作者：
N. Tillmark
中科院分区：
文献类型：
--
作者：
V. Eliasson;N. Apazidis;N. Tillmark
通过实验和数值模拟研究了人工扰动对强会聚圆柱激波特性的影响。在环形截面激波管中产生的环形激波在安装在激波管后端的薄圆柱形试验段中转化为会聚圆柱形激波。收敛圆柱激波被放置在不同位置的小圆柱扰动，并在试验段中的各种模式。研究了它们对激波收敛和反射过程的影响。结果表明，对称分布的扰动将使会聚激波阵面产生对称变形。例如，一个正方形的编队产生一个类似正方形的激波，而一个八角形的编队产生一个具有八角形前缘的激波。这引入了一种定制会聚激波形式的替代方法，而不是使用特定形式的反射器边界。本文还研究了非对称扰动对激波阵面形状的影响。
The influence of artificial disturbances on the behavior of strong converging cylindrical shocks is investigated experimentally and numerically. Ring-shaped shocks, generated in an annular cross sectional shock tube are transformed to converging cylindrical shocks in a thin cylindrical test section, mounted at the rear end of the shock tube. The converging cylindrical shocks are perturbed by small cylinders placed at different locations and in various patterns in the test section. Their influence on the shock convergence and reflection process is investigated. It is found that disturbances arranged in a symmetrical pattern will produce a symmetrical deformation of the converging shockfront. For example, a square formation produces a square-like shock and an octagon formation a shock with an octagonal front. This introduces an alternative way of tailoring the form of a converging shock, instead of using a specific form of a reflector boundary. The influence of disturbances arranged in non-symmetric patterns on the shape of the shockfront is also investigated.