水平排布方式预爆轰点火过程的数值模拟  

The Numerical Simulation of Level Arrangement Pre-Detonation's Ignition Progress

作　　者：魏雁昕 翁春生[1] 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《莆田学院学报》2016年第5期86-91,共6页Journal of putian University

基　　金：国家自然科学基金资助项目(11472138)

摘　　要：为了研究预爆轰点火对脉冲爆轰发动机燃烧转爆轰过程的影响,采用二维CE/SE计算方法对脉冲爆轰发动机预爆轰点火过程进行数值模拟研究。分析了预爆轰点火方式和管径比对主爆轰管内起爆过程的影响。数值计算表明:采用预爆轰点火方式可以有效实现燃烧向爆轰的转捩,最终形成可以稳定传播的爆轰波,在此过程中激波在管壁和中心轴线上的反射起到了非常重要的作用。预爆轰管和主爆轰管的管径比对燃烧转爆轰有显著的影响,增大管径比可以有效缩短DDT距离和时间,对爆轰波强度影响甚小。In order to study the influence of pre-detonation＇s ignition on the transition from deflagration to detonation in pulse-detonation-engine, two-dimensional CE/SE method was used to simulate this process. The mode of the pre- detonation＇s ignition was analyzed. In addition, the effect of pipe diameter ratio in the ignition was involved in this article. The results from the numerical calculation showed that： the method of pre-detonation＇s ignition could be used to achieve the transition from deflagration to detonation; furthermore,it could form the detonation wave which could propagate stably. During this process, the reflection of the shock waves on the tube wall and the central axis plays a very important role. The ratio of the diameters between the pre-detonation＇s tube and the main detonation＇s tube has a significant influence on this transition process. More specifically, increasing the ratio could shorten the DDT distance and time significantly, with very small effect on the intensity of the detonation wave.

关 键 词：脉冲爆轰发动机 预爆轰 点火过程 CE/SE方法 管径比 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]