However, the radial penetration distance of umbrella spray was much shorter than that of multi hole spray and the umbrella spray Angle decreased rapidly in the early stage of spray development.

伞形喷雾径向贯穿距离远小于多孔喷雾，喷雾锥角在喷雾早期急剧减小。

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The research achievements can provide referenced basis for both the development of spray heads and the design and installment of water mist fire suppression systems in the future.

本文的研究成果具有较大的理论价值和工程实用性，能为今后细水雾喷头的研制、细水雾灭火系统的设计及安装提供重要的理论和实验依据。

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Present situation and development tendency of technical preventing coal spontaneous combustion adopted with plasticity slurry that can spray and pour domestic and international are discussed.

综述了国内外喷注型浆体防煤自燃技术的现状和发展趋势，通过实验，得出塑性石膏浆的配制方案和堵漏风效果。

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