Investigation initiation, transition and extinction of detonation instability

爆炸不稳定性的启动、转变和消除研究

• 批准号: 15560190
• 负责人: MATSUO Akiko
• 金额: $ 2.37万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560190/
• 关键词: detonation; computational fluid dynamics; explosion; 再着火

I investigated initiation, transition and extinction of detonation instability.One of the studies aimed at revealing the unsteadiness of one-dimensional unsteady detonation wave front and the explosion nature behind the shock wave. Based on the results of numerical study of one-dimensional unsteady detonation. I investigated an analogy between one-dimensional piston-supported unsteady detonations and two-dimensional wedge-induced steady oblique detonations, and the analogy was applied to a prediction of the wave structure of the wedge-induced steady oblique detonation. The detailed features of one-dimensional detonation were indicated. A one-step chemical reaction obeying an Arrhenius rate expression and 19 forward and backward chemical reactions for hydrogen-oxygen combustion mechanism were used. The unsteadiness of the detonation wave front and the features of the explosion behind the shock were investigated using each reaction model. When the detailed chemical reaction model was used, the induction region can be reproduced regardless of gas conditions. Furthermore, the features related to the second explosion limit appeared in the flow field because the detailed chemical reaction model can reproduce the production and deactivation of OH radical.The other of the studies revealed the characteristics of longitudinal oscillations due to the interaction between the shock front and the reaction front. One- and two-dimensional detonation simulations were performed with a simplified reaction mechanism to compare their oscillations. I have treated two-dimensional detonations with a detailed reaction mechanism to clarify the characteristics of transverse oscillations that play a prominent rule in detonation propagation. According to the results, transverse wave intensity was newly proposed for a guide to understand the mixture properties. It gave us the insight into control of detonation in safety engineering, and application in aerospace engineering.

我研究了爆轰不稳定性的引发、转变和消失。其中一项研究旨在揭示一维非定常爆轰波前的不稳定性以及冲击波背后的爆炸本质。基于一维非定常爆轰数值研究的结果。我研究了一维活塞支撑的非定常爆炸和二维楔形诱发的稳定倾斜爆炸之间的类比，并将该类比应用于楔形诱发的稳定倾斜爆炸的波结构的预测。指出了一维爆轰的详细特征。采用遵循阿累尼乌斯速率表达式的一步化学反应和 19 个氢氧燃烧机制的正向和反向化学反应。使用每种反应模型研究了爆轰波前的不稳定性和冲击后爆炸的特征。当使用详细的化学反应模型时，无论气体条件如何，都可以再现感应区域。此外，由于详细的化学反应模型可以再现OH自由基的产生和失活，流场中出现了与第二爆炸极限相关的特征。另一项研究揭示了由于激波前沿与反应前沿之间的相互作用而产生的纵向振荡特征。使用简化的反应机制进行一维和二维爆炸模拟，以比较它们的振荡。我用详细的反应机制处理了二维爆炸，以阐明在爆炸传播中起着重要作用的横向振荡的特征。根据结果​​，新提出了横波强度来指导了解混合物特性。它让我们深入了解安全工程中的爆炸控制以及在航空航天工程中的应用。

项目成果

Oscillation Transition in Decay Process of Overdriven Detonation

超速爆震衰变过程中的振荡转变

• 发表时间: 2004
• 期刊: Science and Technology of Energetic Materials Vol.65,No.4
• 作者: Inaba;K.
• 通讯作者: K.

Numerical Investigation on Acoustic Coupling of Transverse Waves in Two-Dimensional H_2-O_2-Diluent Detonations

二维H_2-O_2-稀释爆炸中横波声耦合的数值研究

• 发表时间: 2005
• 期刊: Transactions of the Japan Society for Aeronautical and Space Sciences Vol.47,No.158
• 作者: Inaba;K.
• 通讯作者: K.

Numerical Investigation on Acoustic Coupling of Transverse Waves in Two-Dimensional H2-O2-Diluent Detonations

二维H2-O2-稀释剂爆炸中横波声耦合的数值研究

• 发表时间: 2005
• 期刊: Transactions of the Japan Society for Aeronautical and Space Sciences Vol.47,No.158
• 作者: Inaba;K.
• 通讯作者: K.

Analogy between Wedge-Induced steady Oblique Detonation and One- Dimensional Piston-Supported Unsteady Detonation

楔块诱发稳态斜爆与一维活塞支撑非稳态爆轰的类比

• 发表时间: 2004
• 期刊: Science and Technology of Energetic Materials Vol.65,No.4
• 作者: Daimon;Y.
• 通讯作者: Y.