乙烯对煤粉-氧气爆轰波起爆特性影响机制的实验研究  

Experimental Study on the Effect of Ethylene on the Detonation Wave Initiation of Coal Powder/oxygen Mixture

作　　者：罗永晨 续晗 张锋 郑权[1] 翁春生[1] LUO Yongchen;XU Han;ZHANG Feng;ZHENG Quan;WENG Chunsheng(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

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：《兵工学报》2024年第3期754-762,共9页Acta Armamentarii

基　　金：国家自然科学基金项目(12002167);中央高校基本科研业务费专项资金项目(30919011259)。

摘　　要：为实现煤粉连续旋转爆轰发动机的可靠点火,开展乙烯对煤粉-氧气起爆特性的影响机制研究。在初始压力p 0=100 kPa下,采用高能电点火对有无0.5当量比乙烯氛围下的煤粉-氧气混合物开展直接起爆实验研究。点火能量通过测定在空气中高能电火花产生的爆炸波压强进行计算。计算后发现:采用6.3 J的有效点火能量,煤粉-氧气在不含乙烯的氛围下无法起爆;在此能量下,煤粉-氧气在0.5当量比的乙烯氛围条件下可实现直接起爆;将能量降低为3.6 J,使其低于乙烯-氧气(0.5当量比)混合物的临界起爆能量,虽然乙烯-氧气无法直接起爆,但是在加入煤粉后却可以形成稳定的自持爆轰波。研究结果表明:若要实现煤粉-氧气的直接起爆,则需要添加一定量的助爆气体(如乙烯);煤粉的加入还可以拓宽乙烯-氧气混合物的起爆极限。所得结果可以为煤粉连续旋转爆轰发动机的点火起爆提供理论依据并提供技术支撑。The influence mechanism of ethylene on the detonation initiation characteristics of coal powder/oxygen mixture is studied to realize the reliable ignition of the coal powder continuous rotating detonation engine.At the initial pressure of 100 kPa,an electric ignition with high energy is used to carry out the direct detonation initiation experiments on the coal powder/oxygen mixture with and without the ethylene.The ignition energy is calculated by measuring the pressure of explosive wave produced via a high-energy electric spark in air.The coal powder/oxygen mixture cannot detonate without ethylene under the action of effective ignition energy of 6.3 J.In this energy,if the ethylene with the equivalence ratio of 0.5 is added,the coal powder/oxygen mixture can be successfully initiated.If the effective ignition energy is reduced to 3.6 J to made it be lower thanthe critical initiation energy of ethylene/oxygen mixture with an equivalent ratio of 0.5.the detonationcould be onset after adding coal powder.The above studies show that a certain amount of detonable gas(such as ethylene)needs to be added for the dirct detonation initiation of coal powder/oxygen mixture.On the other hand,the addition of coal powder can also broaden the detonation limit of ethylene/oxygen mixture.The results of this study can provide theoretical basis and technical support for the ignition of coal continuous rotating detonation engine.

关 键 词：粉末连续旋转爆轰发动机 爆轰 煤粉 直接起爆 临界起爆能量 气-固两相爆轰 

分 类 号：O381[理学—流体力学]