两相爆震波多管同步点火技术的实验研究

Experimental investigation on multi-pipe synchronous ignition technique using two-phase detonation wave

关键词:  火箭发动机  爆震波  两相  点火  多管

Key words:  Rocket engine  Detonation wave  Two-phase  Ignition  Multi-pipe

摘要:

为了研究基于液态燃料的爆震波点火技术,进行了一系列液态煤油/氧气爆震波点火实验。实验中氧气和煤油的供给压力分别为1.0 MPa和0.7 MPa,火花塞点火能量为50 mJ。研究了两相爆震波点火技术的基本特性,实验表明:采用低点火能量能够快速产生充分发展的爆震波,煤油/氧气爆震压力可达4.0 MPa,爆震波速度可达1500 m/s到2001 m/s,尾焰温度约为2075 K。开展了两相爆震波由单管向多管传播的实验,验证了两相爆震波多管点火技术的可行性,目前可实现四管同步点火。实验显示两相爆震波点火技术重复性强,多管点火具有较好的同步性,时间差别为几十个微秒量级,适用于多燃烧室液态火箭发动机的同步点火。

Abstract:

To investigate the detonation wave ignition technique based on the liquid fuel,a series of detonation wave ignition experiments utilizing liquid kerosene as fuel and oxygen as oxidizer were conducted.The supply pressure of oxygen and kerosene were around 1.0 MPa and 0.7 MPa,respectively.The ignition energy of spark plug was only round 50 mJ.The primary characteristic of two-phase detonation wave ignition technique was investigated.The experiment demonstrated that a fully developed detonation wave could be rapidly produced with low ignition energy.The detonation pressure of kerosene/ oxygen reaches 4.0 MPa and the velocity of detonation wave is in the range of 1500 m/s to 2001 m/s as well as the temperature in the exhaust flow is approximately 2075 K.Experiments of two-phase detonation propagation from a single pipe to multi-pipe were carried out to verify the feasibility of multi-pipe ignition technique using two-phase detonation wave.Up to now,synchronous ignition in four pipes using detonation wave ignition technique has been successfully achieved.The results suggested that the reduplication of two-phase detonation wave ignition technique is reliable.The synchronization in multi-pipe ignition is excellent,and the time deviation is in the order of 10-5s.The kerosene/oxygen detonation wave ignition technique is suitable to synchronous ignition for rocket engines with multi-combustor.