氧化剂喷注面积对旋转爆震波传播特性影响的实验研究

Experimental Research of Rotating Detonation Wave Propagation Characteristics Effected by Oxidizer Injection Area

关键词:  旋转爆震波  氧化剂喷注面积  当量比  轴向位置

Key words:  Rotating detonation wave  Oxidizer injection area  Equivalence ratio  Axial position

摘要:

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H2，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。

Abstract:

Experiments were established on changing the oxidizer injection area to explore the rotating detonation wave (RDW) propagation characteristics effected by the area，and validate the working feasibility of successful igniting rotating detonation engine (RDE) in this condition. H2 as fuel and air as oxidizer were separately injected into annular combustor through the slot-orifice injection configuration. The experimental results show RDE can steadily operate in a wider range of oxidizer injection area，and the best area ratio of the oxidizer injection area to combustor cross section area for the engine is 0.13，the propagation frequency of RDW ranges from 3.97 to 4.29kHz，propagation velocity ranges from 1610.76 to 1832.47m/s and peak pressure fluctuation intensity is less than 30%. The propagation process was comparatively studied in different equivalence ratio，the result indicates that increasing equivalence ratio can obtain steadily RDW with area ratio larger than 0.27. The analysis of RDW average peak pressure also shows that the RDW pressure distribution in axial position is effected by oxidizer injection area.