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为了研究氧化剂喷注面积对旋转爆震波传播特性的影响,验证不同氧化剂喷注面积下旋转爆震发动机起爆的可行性,通过改变氧化剂喷注面积开展了大量的实验研究。发动机采用环缝-喷孔式喷注结构,燃料为H_2,氧化剂为空气。实验结果表明,旋转爆震发动机可以在较宽范围的氧化剂喷注面积下稳定工作;氧化剂喷注面积与燃烧室横截面积比为0.13的条件下获得了最佳实验结果,爆震波传播频率为3.97~4.29kHz,传播速度为1610.76~1832.47m/s,峰值压力脉动强度均小于30%。对比了不同当量比条件下爆震波的传播过程,结果表明,在面积比大于0.27的情况下,提高燃料和氧化物的当量比可获得稳定的爆震波。分析轴向位置上爆震波峰值压力的变化,结果表明氧化剂喷注面积的变化影响轴向位置上爆震波压力的分布。
In order to study the influence of oxidant injection area on the propagation characteristics of rotary detonation wave and verify the feasibility of rotary detonation engine detonation under different oxidant injection area, a great deal of experimental research has been carried out by changing the injection area of oxidant. The engine adopts annular slit - spray hole injection structure, the fuel H_2, oxidant for the air. The experimental results show that the rotary detonation engine can work stably under a wide range of oxidant injection area. The best experimental results are obtained under the condition of the injection area of oxidant and the cross-sectional area of the combustion chamber is 0.13. The propagation frequency of the detonation wave is 3.97 ~ 4.29kHz, the propagation velocity is 1610.76 ~ 1832.47m / s, the peak pressure pulsation intensity is less than 30%. The propagation of detonation wave under different equivalent ratio conditions is compared. The results show that stable detonation wave can be obtained by increasing the equivalence ratio of fuel and oxide when the area ratio is greater than 0.27. The change of the peak pressure of the detonation wave in the axial position was analyzed. The results show that the change of the injected area of the oxidant affects the distribution of the detonation pressure in the axial position.