当量比及氧化剂含氧量对凝胶汽油爆轰过程的影响

Effects of stoichiometric ratio and oxygen content of oxidizer on detonation process of gel gasoline

为了研究化学当量比和氧化剂含氧量对凝胶汽油/气相氧化剂两相爆轰过程的影响,建立了考虑组分的凝胶汽油/空气三维两相爆轰模型,并采用守恒元与求解元方法对脉冲爆轰发动机管内爆轰过程进行了数值仿真,分析了当量比和氧化剂含氧量对爆轰波形成时间、形成距离、爆轰波压力峰值和爆轰波传播速度的影响。数值研究结果表明,当量比α小于1.15时,随着当量比的增大,脉冲爆轰发动机管内形成爆轰波所需的距离和时间缩短,爆轰波的压力峰值和传播速度增大,当量比α=1.15时形成爆轰波所需的距离和时间分别为0.288 m和278.0μs,爆轰波压力峰值和传播速度分别为1.85 MPa和1437 m·s^-1;随着氧化剂含氧量β的增大,爆轰波的压力峰值和传播速度增大,当氧化剂含氧量β由23%增大至48%时,爆轰波的压力峰值由1.85 MPa增大至2.85 MPa,传播速度则由1437 m·s^-1增大至1868 m·s^-1。

In order to study the influence of stoichiometric ratio and oxygen content of oxidant on detonation process of gelled gasoline/gas-phase oxidant,a three-dimensional two-phase detonation model of gelled gasoline and gas-phase oxidant was established,and the internal detonation process of pulse detonation engine was simulated numerically using conservation element and solving element method.The effect of stoichiometric ratio and oxygen content of oxidant on the formation time,formation distance,peak pressure and propagation velocity of detonation wave were analyzed.The numerical results indicated that when the stoichiometric ratio is lower than 1.15,the formation distance and time of detonation wave decrease with increasing of stoichiometric ratio,and the pressure peak and propagation velocity of detonation wave increase at the same time.When the stoichiometric ratio is of 1.15,the formation distance and time of detonation wave are 0.288 m and 278μs,and the pressure peak and propagation velocity of detonation wave are 1.85 MPa and 1437 m·s^-1,respectively.The pressure peak and propagation velocity of detonation wave increase with increasing oxygen content of oxidant,and when the oxygen content increases from 23% to 48%,the pressure peak and propagation velocity of detonation wave increase from 1.85MPa,1437 m·s^-1 to 2.85MPa,1868 m·s^-1,respectively.