热沉冷却式薄壁量热计设计及分析
发布时间：2018-11-15 15:05
【摘要】：为满足大当量战斗部热毁伤威力评估的需求,弥补传统薄壁量热计在爆炸场环境中易变形、易烧蚀的不足,采用在热敏元件后壁面添加热沉体的方式,设计一种新型热沉冷却式热流密度传感器,以间接测量的方式,通过热敏元件后壁面温度,获得入射热流密度。建立传感器理论模型,推导响应时间表达式,并对传感器响应特性进行数值仿真,仿真结果显示:传感器响应时间只与热敏元件的尺寸和材料有关,与热沉体无关。以0.5 mm紫铜作为热敏元件的传感器响应时间可达1.2 ms左右;热沉体吸热系数越大,热敏元件温升越小,同时,随着时间的增加,温升速率逐渐减小。验证试验显示,热沉体的加入可有效降低热敏元件温升,所设计传感器可正确反映入射热流变化。
[Abstract]:In order to meet the need of evaluating the thermal damage power of large equivalent warhead and to make up for the deficiency of traditional thin-walled calorimeter which is easy to deform and ablation in the explosion field, the heat sink is added to the back wall of the heat sensitive element. A new heat sink cooling heat flux sensor is designed. The incident heat flux is obtained by indirectly measuring the temperature of the back wall of the heat sensitive element. The theoretical model of the sensor is established, the expression of the response time is derived, and the response characteristics of the sensor are numerically simulated. The simulation results show that the response time of the sensor is only related to the size and material of the heat sensitive element, but independent of the heat sink. The response time of the sensor with 0.5 mm copper as the thermal sensor can reach about 1.2 ms, the larger the heat absorption coefficient of the heat sink, the smaller the temperature rise of the heat sensitive element, and the smaller the temperature rise rate is with the increase of time. The experimental results show that the addition of the heat sink can effectively reduce the temperature rise of the heat sensitive element, and the sensor can accurately reflect the change of the incident heat flux.
【作者单位】： 南京理工大学机械工程学院;
【基金】：国防科工局技术基础科研项目(JSJL2014606B003)资助
【分类号】：TP212
本文编号：2333634
[Abstract]:In order to meet the need of evaluating the thermal damage power of large equivalent warhead and to make up for the deficiency of traditional thin-walled calorimeter which is easy to deform and ablation in the explosion field, the heat sink is added to the back wall of the heat sensitive element. A new heat sink cooling heat flux sensor is designed. The incident heat flux is obtained by indirectly measuring the temperature of the back wall of the heat sensitive element. The theoretical model of the sensor is established, the expression of the response time is derived, and the response characteristics of the sensor are numerically simulated. The simulation results show that the response time of the sensor is only related to the size and material of the heat sensitive element, but independent of the heat sink. The response time of the sensor with 0.5 mm copper as the thermal sensor can reach about 1.2 ms, the larger the heat absorption coefficient of the heat sink, the smaller the temperature rise of the heat sensitive element, and the smaller the temperature rise rate is with the increase of time. The experimental results show that the addition of the heat sink can effectively reduce the temperature rise of the heat sensitive element, and the sensor can accurately reflect the change of the incident heat flux.
【作者单位】： 南京理工大学机械工程学院;
【基金】：国防科工局技术基础科研项目(JSJL2014606B003)资助
【分类号】：TP212
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