Experimental study of acoustic behavior of three-tube PDE system in near-field

Huang Xiaolong; Weng Chunsheng; Li Ning; Xu Guiyang

doi:10.11883/1001-1455(2016)05-0633-07

Volume 36 Issue 5

Oct. 2018

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Huang Xiaolong, Weng Chunsheng, Li Ning, Xu Guiyang. Experimental study of acoustic behavior of three-tube PDE system in near-field[J]. Explosion And Shock Waves, 2016, 36(5): 633-639. doi: 10.11883/1001-1455(2016)05-0633-07

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Experimental study of acoustic behavior of three-tube PDE system in near-field

doi: 10.11883/1001-1455(2016)05-0633-07

National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received Date: 2015-01-27
Rev Recd Date: 2015-04-30
Publish Date: 2016-09-25

Abstract

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.
- mechanics of explosion,
- detonation noise,
- reference radius,
- pulse detonation engine,
- directivity,
- time of duration

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