强点火条件下RP-3航空煤油燃爆特性实验研究

摘要

为进一步探究影响RP-3航空煤油燃爆特性参数的因素,在内径为200mm、高度为5400mm的立式激波管中,采用强点火方式,测定了其在不同浓度下的临界起爆能以及不同起爆能量、浓度当量比、喷雾压力下RP-3航空煤油的爆速和爆压.实验结果表明:航空煤油的临界起爆能随浓度当量比的增加先急剧降低,达到最小值后又缓慢上升,基本呈"L"形变化;在喷雾压力为0.20~0.60MPa、同一浓度条件下,RP-3航空煤油的爆速、爆压随喷雾压力的变化曲线呈倒"U"形;随着起爆能量升高,爆速、爆压均呈直线上升趋势,并且当起爆能量小于1.68MJ/m2时,煤油未达到直接爆轰状态;燃料的爆速、爆压随浓度当量比的增加先上升后下降,其变化趋势也基本呈倒"U"形.%In this study,the deflagration and detonation parameters of RP-3 aviation kerosene in a vertical shock tube,200 mm in inner diameter and 5 400 mm in height,was measured at different initiation energies, spray pressures and equivalence ratios in direct ignition by a high explosive to further explore the influencing factors of the combustion characteristics of the RP-3 aviation kerosene.The results show that the critical initi-ation energy of the aviation kerosene decreases sharply at first and then rises slowly with the increase of the equivalence ratio,and its changing trends are basically in an"L"shape.When the spray pressure varies from 0.20 MPa to 0.60 MPa,the detonation velocity and the explosion pressure are both in the shape of an inverted"U"along with the changing of the spray pressure at the same fuel concentration.The detonation velocity and the explosion pressure curves have a linear ascending tendency with the increase of the initiation energy.More-over,when the initiation energy ranges from 0.37 MJ/m2to 1.68 MJ/m2,the aviation kerosene cannot reach the state of detonation.The detonation velocity and the explosion pressure of the fuel at first increase and then decrease along with the rising of the equivalence ratio,also in an inverted"U"shape.