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文摘
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喷管不但可以增加脉冲爆轰发动机推力,而且对脉冲爆轰发动机噪声的形成与传播也具有重要作用。为探索脉冲爆轰发动机爆轰噪声形成机理及控制技术,搭建了脉冲爆轰发动机噪声测试实验系统,在不同位置不同角度对3种不同类型喷管的脉冲爆轰发动机爆轰噪声特性进行了研究。研究结果表明,收敛扩张喷管对于减小脉冲爆轰发动机爆轰噪声幅值作用最为明显,在0°方向3000mm处可以达到77.13%的降幅;对于收敛喷管,收敛角度越大指向性越明显,而扩张和收敛扩张喷管的喷管出口面积越大指向性越不明显;喉部直径48mm的收敛扩张喷管与管口直径280mm和320mm的扩张喷管对参考半径影响最为显著,参考半径由1600mm减小至800mm. 研究结果对于爆轰噪声机理研究以及脉冲爆轰发动机工程化应用具有重要参考意义。 |
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其他语种文摘
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As an effective approach to improve the thrust performance, the nozzle plays an important role in the control of formation and propagation of pulse detonation engine noise. The experimental system of pulse detonation engine is set up to investigate the formation and control method of detonation noise. The detonation noise characteristic of pulse detonation engine with three nozzles is studied. The results show that the convergent-divergent nozzle has the most significant influence on pulse detonation engine noise to reduce the noise amplitude by 77.13% in 0 ° direction and at 3000mm. Large convergence angle would lead to obvious directivity for convergent nozzles. The obvious directivity would be also obtained by divergent and convergent-divergent nozzles with small exit area. The convergent-divergent nozzle with 48 mm throat diameter and the divergent nozzles with 280 and 320mm exit diameters have the significant impact on reference radius which is reduced from 1600mm to 800mm. The results are of great significance for studying the mechanism of detonation noise and expediting the process of the engineering application. |
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来源
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兵工学报
,2014,35(11):1799-1804 【核心库】
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DOI
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10.3969/j.issn.1000-1093.2014.11.010
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关键词
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兵器科学与技术
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脉冲爆轰发动机
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噪声辐射
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指向性
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喷管
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地址
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南京理工大学, 瞬态物理国家重点实验室, 江苏, 南京, 210094
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-1093 |
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学科
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航空 |
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基金
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国家自然科学基金项目
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国家教育部高等学校博士学科点专项科研基金
;
中央高校基本科研业务费专项资金
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文献收藏号
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CSCD:5299920
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