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Mechanisms of detonation initiation in multi-focusing systems
Shock Waves ( IF 2.2 ) Pub Date : 2020-09-08 , DOI: 10.1007/s00193-020-00969-6 P. S. Utkin , A. I. Lopato , A. A. Vasil’ev
Shock Waves ( IF 2.2 ) Pub Date : 2020-09-08 , DOI: 10.1007/s00193-020-00969-6 P. S. Utkin , A. I. Lopato , A. A. Vasil’ev
The work is dedicated to the experimental and numerical study of the mechanisms of gaseous detonation initiation in a stoichiometric hydrogen–oxygen mixture due to the reflection of a shock wave from a complex-shaped end wall. Several elliptic surfaces of different geometries, including distributed ones, were considered. We refer to such reflectors with multiple elliptical surfaces as multi-focusing systems. The experiments were carried out in a shock tube. Visualization of the process was carried out with a high-speed schlieren system. In the experiments, the ignition delay times and the critical incident shock wave Mach number for detonation initiation were measured. Two-dimensional Euler simulations, on a fully unstructured computational grid, were carried out to determine the mechanism of detonation initiation. The numerical approach was verified using the experimentally measured ignition delay times. Reasonable agreement between the simulations and experiments for the critical Mach number of detonation initiation and for the efficiency of various multi-focusing systems for detonation initiation was achieved. Different regimes of detonation initiation depending on the incident shock wave Mach number were observed.
中文翻译:
多聚焦系统起爆机理
这项工作致力于对化学计量的氢氧混合物中由于冲击波从复杂形状的端壁反射而引发气态爆轰的机制进行实验和数值研究。考虑了不同几何形状的几个椭圆表面,包括分布式的。我们将这种具有多个椭圆表面的反射器称为多聚焦系统。实验在激波管中进行。过程的可视化是用高速纹影系统进行的。在实验中,测量了引爆的点火延迟时间和临界入射冲击波马赫数。在完全非结构化的计算网格上进行二维欧拉模拟,以确定起爆机制。使用实验测量的点火延迟时间来验证数值方法。爆轰起爆临界马赫数和各种多聚焦系统起爆效率的模拟和实验之间取得了合理的一致性。观察到取决于入射冲击波马赫数的不同起爆机制。
更新日期:2020-09-08
中文翻译:
多聚焦系统起爆机理
这项工作致力于对化学计量的氢氧混合物中由于冲击波从复杂形状的端壁反射而引发气态爆轰的机制进行实验和数值研究。考虑了不同几何形状的几个椭圆表面,包括分布式的。我们将这种具有多个椭圆表面的反射器称为多聚焦系统。实验在激波管中进行。过程的可视化是用高速纹影系统进行的。在实验中,测量了引爆的点火延迟时间和临界入射冲击波马赫数。在完全非结构化的计算网格上进行二维欧拉模拟,以确定起爆机制。使用实验测量的点火延迟时间来验证数值方法。爆轰起爆临界马赫数和各种多聚焦系统起爆效率的模拟和实验之间取得了合理的一致性。观察到取决于入射冲击波马赫数的不同起爆机制。