目的 探究装药尺寸效应对压装装药烤燃特性的影响规律。方法 本文开展不同量级装药的烤燃试验与数值模拟计算。通过开展百克级、公斤级及十公斤级HMX基压装装药烤燃试验,获得不同装药尺度下的烤燃响应特性参数;建立压装炸药烤燃数值模型,采用用户自定义函数（UDF）描述炸药自热反应过程,并基于Fluent平台对不同尺度的试验弹进行了数值计算。结果 结果表明,在3.3 ℃/h的慢烤条件下,随着装药量由百克级增至十公斤级,装药点火时间逐渐缩短,点火位置由装药中心向边缘区域转移,试验弹整体响应剧烈程度有所降低。结论 分析认为,尺寸效应主要体现为随着装药尺寸增大,装药内部热阻增大,单位体积、单位时间内传入装药内部的热量逐渐减少,响应瞬间参与反应的炸药比例降低,最终导致样弹响应剧烈程度减弱。
Abstract
The work aims to explore the impact of charge size effect on the cook-off characteristics of pressed charges. Cook-off tests and numerical simulation calculations of different orders of charge were carried out. By conducting cook-off tests of hundred-gram, kilogram and ten-kilogram HMX-based pressed charges, the cook-off response characteristic parameters under different charge scales were obtained. A numerical model of the cook-off of pressed charges was established, and a user-defined function (UDF) was used to describe the self-heating reaction process of the charge, and numerical calculations were carried out on test bombs of different scales based on the Fluent platform. The results showed that under the slow-roasting condition of 3.3 ℃/h, as the charge increased from 100 grams to 10 kilograms, the ignition time of the charge gradually shortened, the ignition position shifted from the center of the charge to the edge area, and the overall response of the test bomb was reduced. The severity of the response was reduced. Analysis shows that the size effect is mainly reflected in the following: as the size of the charge increases, the internal thermal resistance of the charge increases, the heat transferred into the charge per unit volume and unit time gradually decreases, and the proportion of explosive participating in the reaction at the moment of response decreases, which ultimately leads to a weakening of the response intensity of the sample bomb.
关键词
爆炸力学 /
HMX基压装装药 /
尺寸效应 /
响应特性
Key words
explosion mechanics /
HMX-based pressed charge /
size effect /
response characteristics
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