【作者】 许卓； 董刚；

【Author】 Xu Zhuo;Dong Gang;National Key Laboratory of Transient Physics of Nanjing University of Science and Technology;

【机构】 南京理工大学瞬态物理实验室；

【摘要】 爆轰波存在于工业和民用燃烧、爆轰推进技术等各个领域,开展与爆轰波相关的数值模拟具有广泛的应用前景。近来与爆轰波相关的数值模拟基本都集中在理想爆轰的研究上,事实上,在实际中存在着非理想爆轰的情况,探究非理想爆轰对爆轰波结构的影响具有重要的科学意义。本文采用二维无粘Euler方程和两步连续反应模型对楔面诱导产生的斜爆轰进行数值模拟,在保证总放热量不变的情况下,通过使第二个反应由放热反应转化为吸热反应,从而形成非理想爆轰。将理想爆轰与非理想爆轰的结果进行了比较,重点考察了斜爆轰结构的变化。数值模拟结果显示,与理想爆轰稳定后的流场结构相比,非理想爆轰的诱导区长度增大,非理想爆轰波面更容易失稳,易形成胞格结构。当第一个反应的放热量越多,爆轰波阵面结构会越不稳定。更多还原

【Abstract】 Detonations exist in industrial and civil combustion, detonation propulsion technology and other fields.Numerical simulation of detonations contains good application value in future. Recently, the numerical simulation related to detonations is mainly focused on the study of ideal detonations. In fact, there are pathological detonations in practice. It is of great scientific significance to explore the influence of pathological detonations on detonation structure. In this paper, the two-dimensional in-viscid Euler equation and two-step consecutive irreversible reactions are used to simulate the oblique detonation induced by wedge surface. With keeping the total heat release constant, the second reaction is transformed from exothermic reaction to endothermic reaction to form pathological detonation. The results of ideal detonation and pathological detonation are compared, and the change of oblique detonation structure is mainly investigated. The numerical simulation results show that the length of the induced zone of the pathological detonation is increased compared with the flow field structure of ideal detonation.The pathological detonation surface is more prone to instability, and the cell structure is easy to form. The more heat released in the first reaction, the more unstable the detonation structure will be.更多还原