Experimental study of acoustic behavior of three-tube PDE system in near-field
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摘要: 为研究三爆轰管脉冲爆轰发动机噪声的形成机理和特性，设计了正三角形组合的三爆轰管PDE实验系统，分别在与中心轴线成0°、30°、60°及90°方向上，对8个不同距离处的声压进行了测量，结果表明：不同距离处噪声幅值最大值均在30°方向上；爆轰噪声的参考半径为3倍“名义管径”；爆轰噪声的A持续时间随着r(距离三爆轰管名义“中点”的直线距离)的增加近似线性减小，并随着角度的增大而减小。B持续时间与声压值的大小成反比关系，并且随着轴向距离的增加而增加。在不同的方位角上，峰值声压越大，B持续时间越小。Abstract: In the present work, a testing system consisting of three detonation tubes was designed in a regular triangle to investigate the noise characteristics of a three-tube PDE system and their formation mechanism. The distance between each tube and the central axis is 200 mm. The directivity of acoustic emissions is measured using a circular array of four transducers (0°, 30°, 60°, and 90°) at various radial distances. Results show that all the max peak pressures appear in the directivity of 30°. The referential radius of the detonation noise is three times that of the "nominal tube diameter". The duration of A time decreases almost linearly along with the increase of r (the distance to the nominal "central point" of the three detonation tubes), and also decreases with the increase of the angle. The duration of B time is inversely proportional to the noise amplitude, and increases with the increase of the axial distance. At different angles, the greater the peak pressure, the smaller the duration of B time.
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Key words:
- mechanics of explosion /
- detonation noise /
- reference radius /
- pulse detonation engine /
- directivity /
- time of duration
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图 2 爆轰噪声峰值随距离r变化的拟合曲线
Figure 2. Fitted curves of detonation noise amplitudes varying with different distances
图 8 峰值声压级的指向性和B持续时间随方位角的变化曲线
Figure 8. Curves of detonation noise directivity and B time duration varying with different angles
图 9 800、1 000 mm处压力波形对比
Figure 9. Curves of detonation noise amplitudes varying with time at 800, 1 000 mm
表 1 爆轰噪声的持续时间
Table 1. Time of duration for detonation noise
φ/(°) r=600 mm r=800 mm r=1 000 mm r=1 200 mm A B A B A B A B 0 0.55 9.64 0.61 10.93 0.63 12.10 0.64 25.56 30 0.45 6.61 0.49 8.14 0.50 9.51 0.57 12.90 60 0.39 7.13 0.41 8.28 0.44 9.16 0.47 14.82 90 0.37 9.16 0.39 12.50 0.40 15.26 0.42 21.91 
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