"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”

基本信息

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

项目摘要

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.

爆炸波是自我维持的超音速反应波，可以在反应性气体和凝结相的能量材料（推进剂，炸药，尘埃等）中维持。气体爆炸后发生的大型过压使其对推进应用有用。这些应用需要准确控制波启动和波稳定性。对于安全应用，每当意外释放出令人着迷的气体时，都希望能够预测最终的点火和传播限制和大规模效应，以制定适当的缓解策略。不幸的是，在典型的工程应用中无法预测爆炸波动力学。本研究的目标是开发这样的预测模型。为了达到此建模能力，我们将分两个步骤进行。首先，使用一种新型的实验技术研究了控制能量释放速率的爆炸结构内发生的小尺度物理现象。该技术在良好的可重复实验中分离出爆炸波的规范特征，即反应性三重冲击构型。同时对这种现象的高保真数值模拟使我们能够量化管理局部和全球流放率的各种物理不稳定性。其次，我们制定和测试适当的反应区模型，以使我们能够进行工程计算，并在用户尺度上以足够的忠诚度预测爆炸现象，这些现象通常比反应区不稳定性大六个数量级以上。这些模型是通过数学上以小尺度上观察到的物理观测来获得的，并根据关键实验对其进行校准。