冷等离子体放电区长度对爆震特性影响的实验研究  

Experimental Study on Detonation Characteristics Influenced by Discharge Area in Low Temperature Plasma Generators

作　　者：郑殿峰[1] 王兵[2] ZHENG Dian-feng;WANG Bing(College of Engineering,Peking University,Beijing 100871,China;School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京大学工学院,北京100871 [2]清华大学航天航空学院,北京100084

出　　处：《气体物理》2020年第1期34-41,共8页Physics of Gases

摘　　要：快速高效的起爆对脉冲爆震发动机工作特性的作用十分关键.文章以乙炔为燃料、空气为氧化剂,使用双爆震管研究冷等离子体和火花塞两种点火方式对起爆特性的影响规律.冷等离子体发生器采用自主设计产品,研究中通过改变冷等离子体放电区长度,测试爆震波的传播过程,给出了放电区体积大小对爆震特性的影响.实验结果表明:冷等离子体点火起爆特性明显优于火花塞;在基本保证放电功率不变时,放电区长度的变化对火焰传播时间、火焰传播速度、爆震波峰值压力影响不大.因此,在工程实践中,采用小区域放电能够减少冷等离子的体积且不影响起爆性能.Fast initiation is the key technology to ensure the working characteristics of pulse detonation engines.This paper investigated the influence of two types of igniter,low temperature plasma generator and spark plug,on initiation properties in dual detonation pipes using acetylene and air mixture.The low temperature plasma generator is an in-house design product.The discharge area was changed to examine the propagation process of detonation wave.The effects of discharge area on propogation of detonation waves were summarized.It is shown that the initiating features by the cold plasma generator are superior to those by the spark plug.With the discharge power fixed,the varation of discharge area has slight influences on flame propagation speed,and detonation wave pressure peaks.Therefore,the use of smaller discharge area in the cold plasma generator can reduce the ignitor volume and ensure the initiation property.

关 键 词：冷等离子体 爆震波 火花塞 爆震管 脉冲爆震发动机 

分 类 号：V231.22[航空宇航科学与技术—航空宇航推进理论与工程]