不同升温速率下模块装药的烤燃特性分析

Analysis of Cook-Off Characteristics of Modular Charges at Different Heating Rates

目的 研究不同升温速率下模块装药烤燃特性的变化。方法 基于模块装药结构及其烤燃化学反应机理,提出基本假设,建立二维非稳态烤燃计算模型,通过数值模拟计算分析研究模块装药在不同工况下的烤燃特性。结果 在3.30、5.25、7.20 K/h的加热条件下,模块装药发生烤燃响应的着火温度分别为476.6、473.1、477.1 K。当模块装药的升温速率不高于5.25 K/h时,仅产生1个位于模块装药径向中心截面单基药处的烤燃环形响应区域;当模块装药的升温速率高于5.25 K/h时,烤燃环形响应区中心点由1个位于模块装药径向中心截面的环形烤燃响应区域变成2个关于模块装药径向中心截面对称的环形烤燃响应区域。结论 随着升温速率的提高,模块装药的烤燃环形响应区中心点由中心向模块装药内壁面区域和端面方向移动,烤燃响应时间与升温速率呈指数关系,但升温速率的变化对烤燃响应温度的影响较小。

This paper is to study the change of cook-off characteristics of modular charges at different heating rates. Based on the structure of the modular charge and its chemical reaction mechanism, the basic assumptions are put forward, a two-dimensional unsteady cook-off calculation model is established, and the cook-off characteristics of the modular charge under different working conditions are analyzed and studied through numerical simulation. Under the heating rates of 3.30, 5.25,and 7.20 K/h, the ignition temperatures at which the cook-off response of modular charge occurred are 476.6, 473.1 and 477.1K. When the heating rate is not higher than 5.25 K/h, only one cook-off annular response region located at the single base charge in the radial center section of the module charge is produced;When the heating rate is higher than 5.25 K/h, the center point of the cook-off annular response region changes from a cook-off annular response region located in the radial center section of the module charge to two cook-off annular response regions symmetrical about the radial center section of the module charge. With the increase of heating rate, the center point of the annular response region of the cook-off moves outward from the center to the inner wall region and end face of the modular charge, the response time of cook-off has an exponential relationship with the heating rate, but the change of heating rate has little effect on the response temperature of cook-off.