激波驱动下硝酸异丙酯的分散变化规律研究-《爆破器材》

文章信息/Info

Title:: Study on Dispersion and Variation of Isopropyl Nitrate Driven by Shock Wave

Author(s):: ZHANG Zilong; SONG Xianzhao; YANG Zifan; LIU Qimin; LI Bin; School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology (Jiangsu Nanjing, 210094)

摘要:: 研究液滴的分散过程对于阻止火灾蔓延、提高内燃机效率、改进云雾爆轰武器和提高云雾爆轰控制技术有着重要的作用。通过高速摄影技术以及压力测量系统，着重研究液态燃料硝酸异丙酯（IPN）的分散过程，分析液膜厚度和激波强度对IPN液膜分散的影响。IPN液膜初始阶段以水平方向的分散为主；随后，以竖直方向的分散为主。水平方向，液膜抛洒先进入减速阶段，随着液膜厚度H的增加，液膜分散效果变差，分散需要的时间更长，其分散表征与石油醚相似。IPN液膜分散所需能量要高于石油醚。激波强度超过某个值之后，超压比ε随液膜厚度H呈线性变化，可以为液膜分散提供足够的能量。当H＜12 mm时，IPN液膜的分散变化过程主要受激波强度影响；当H＞12 mm时，IPN液膜的分散变化过程主要受液膜厚度影响。

Abstract:: The study of droplet dispersion process plays an important role in preventing fire spread, improving the efficiency of internal combustion engine and improving cloud detonation weapon and cloud detonation control technology. Through high-speed photography and pressure measurement system, the dispersion process of liquid fuel isopropyl nitrate (IPN) was emphatically studied, and the influence of liquid film thickness and shock wave intensity on the dispersion of IPN was analyzed. The initial stage of IPN liquid film is dominated by horizontal dispersion, followed by vertical dispersion. In horizontal direction, liquid film sprinkling first enters the deceleration stage. With the increase of thickness of -liquid film H, the dispersion effect of liquid film becomes worse, and the dispersion takes longer time. Its dispersion characterization is similar to that of petroleum ether. The energy required for IPN liquid film dispersion is higher than that of petroleum ether. When the shock wave intensity exceeds a certain value, the overpressure ratio ε??changes linearly with the thickness of liquid film H, which can provide sufficient energy for liquid film dispersion. When H<12mm, the dispersion change process of IPN liquid film is mainly affected by shock wave intensity. While when H>12mm, the dispersion change process of IPN liquid film is mainly affected by thickness of liquid film.