"Predictability of detonation wave phenomena: influence of diffusive processes, hydrodynamic instabilities and relaxation effects on the hydrodynamic description"

“爆轰波现象的可预测性：扩散过程、流体动力学不稳定性和弛豫效应对流体动力学描述的影响”

• 批准号: 341897-2012
• 负责人: Radulescu, Matei
• 金额: $ 2.77万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572403
• 关键词: Predictability; detonation; wave; phenomena; influence

Detonation waves are self-sustained supersonic reaction waves, which can be sustained in reactive gases and condensed phase energetic materials (propellants, explosives, dusts, etc...). The large overpressures occurring behind gaseous detonations make them useful for propulsion applications. These applications require accurate control of the wave initiation and wave stability. For safety applications, whenever a detonable gas is accidentally released, it is desirable to have the capability for predicting the eventual ignition and propagation limits and the large-scale effects in order to develop the appropriate mitigation strategies. Unfortunately, the detonation wave dynamics cannot be predicted in typical engineering applications. The present research's objective is to develop such a predictive model. To arrive at this modeling capability, we proceed in two steps. First, the small-scale physical phenomena occurring within the detonation structure, which control the rate of energy release, are investigated using a novel experimental technique. This technique isolates in well-posed reproducible experiments the canonical feature of detonations waves, namely the reactive triple shock configuration. Simultaneous high-fidelity numerical simulations of this phenomenon permit us to quantify the various physical instabilities governing the local and global rates of exothermicity. Secondly, we formulate and test the appropriate reaction zone models that will permit us to conduct engineering calculations and predict detonation phenomena with sufficient fidelity at user scales, which are typically more than six orders of magnitude larger than reaction zone instabilities. These models are obtained by mathematically formulating the physical observations observed in the experiments at small scales and calibrating them against critical experiments.

爆轰波是自持的超声反应波，其可以在反应气体和凝聚相高能材料（推进剂、炸药、粉尘等）中维持。 在气体爆炸之后发生的大的超压使它们对于推进应用是有用的。 这些应用需要精确控制波浪的起始和波浪稳定性。就安全应用而言，每当意外释放可引爆气体时，最好有能力预测最终的点火和传播极限以及大规模影响，以便制定适当的缓解战略。 不幸的是，爆轰波动力学不能在典型的工程应用中预测。 本研究的目的是开发这样一个预测模型。 为了达到这种建模能力，我们分两步进行。 首先，小尺度的物理现象内发生的爆轰结构，控制的能量释放率，使用一种新的实验技术进行了研究。 这种技术隔离在良好的可重复实验的典型特征的爆轰波，即反应性三重冲击配置。同时高保真的数值模拟这种现象使我们能够量化的各种物理不稳定性的本地和全球的利率bromicity。 其次，我们制定和测试适当的反应区模型，这将使我们能够进行工程计算，并预测爆震现象与足够的保真度在用户规模，这通常是超过6个数量级大于反应区的不稳定性。这些模型是通过在小尺度实验中观察到的物理观测的数学公式化并根据临界实验对其进行校准而获得的。