Mechanism and experimental research on acoustic radiation of pyrotechnic composition combustion underwater
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摘要: 烟火药水下燃烧能够形成低频的水下声.法国烟火集团拉克鲁瓦防御公司研制出了一种"烟火--声电"声诱饵(1995),但是至今还没有进行深入的研究与报道.本文就烟火药水下燃烧的声辐射机理进行了探讨.结果显示,其所辐射的噪声主要包括喷注噪声和气泡噪声,进一步的分析发现主要以气泡噪声为主,喷注湍流噪声为辅.为了证明此观点,实验研究了具有脉动燃烧效应的烟火药水下燃烧时的声辐射特性.Abstract: The combustion of pyrotechnic composition underwater has ability to form a low-frequency underwater sound signal. The French defense company of Lacroix pyrotechnic Group developed a "pyrotechnic-acoustic transmitter" in 1995. However, until now this investigation has not been extensively studied and reported. In this paper, the research of mechanism of the acoustic radiation for pyrotechnic composition combustion underwater was conducted. The results show that the emission noise mainly includes turbulence noise and breakdown bubble noise. The further investigation also revealed that the breakdown bubble noise has the dominant effect comparing with the turbulent noise. In order to prove this viewpoint, the underwater combustion of pyrotechnic composition with pulsating combustion effect was studied through a deep experimental investigation.
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