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Numerical investigation of detonation initiation by a focusing shock wave
Shock Waves ( IF 2.2 ) Pub Date : 2020-10-06 , DOI: 10.1007/s00193-020-00962-z
S. Bengoechea , J. Reiss , M. Lemke , J. Sesterhenn

This work presents a numerical study of detonation initiation by means of a focusing shock wave. The investigated geometry is a part of a pulsed detonation combustion chamber, consisting of a circular pipe in which the flow is obstructed by a single convergent–divergent axisymmetric nozzle. This obstacle acts as a focusing device for an incoming shock wave, serving as a low-energy detonation initiator. The chamber is filled with stoichiometric premixed hydrogen-enriched air. The simulation uses a one-step chemical model with variable parameters optimized by the adjoint approach in terms of the induction time $$\tau _{\text {c}}$$ . The model reproduces $$\tau _{\text {c}}$$ of a complex kinetics model in the range of pressures and temperatures appearing at the focusing point. The results give a comprehensive description of the shock-induced detonation initiation, which is the mechanism for the deflagration-to-detonation transition in this type of configurations. Potential geometry design improvements for technical applications are discussed. The first attempt to parameterize the transition process is also undertaken.

中文翻译:

聚焦激波起爆数值研究

这项工作通过聚焦冲击波对爆震起爆进行了数值研究。所研究的几何形状是脉冲爆震燃烧室的一部分,由一个圆形管道组成,其中的流动被单个会聚-发散轴对称喷嘴阻碍。该障碍物充当入射冲击波的聚焦装置,充当低能量起爆器。腔室充满化学计量的预混合富氢空气。模拟使用一步化学模型,其中变量参数通过伴随方法在诱导时间 $$\tau _{\text {c}}$$ 方面进行优化。该模型在焦点处出现的压力和温度范围内再现了复杂动力学模型的 $$\tau _{\text {c}}$$。结果给出了冲击引起的爆轰起爆的综合描述,这是这种配置中爆燃到爆轰转变的机制。讨论了技术应用的潜在几何设计改进。还进行了对转换过程进行参数化的第一次尝试。
更新日期:2020-10-06
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