【摘要】：為滿足大當(dāng)量戰(zhàn)斗部熱毀傷威力評估的需求,彌補(bǔ)傳統(tǒng)薄壁量熱計在爆炸場環(huán)境中易變形、易燒蝕的不足,采用在熱敏元件后壁面添加熱沉體的方式,設(shè)計一種新型熱沉冷卻式熱流密度傳感器,以間接測量的方式,通過熱敏元件后壁面溫度,獲得入射熱流密度。建立傳感器理論模型,推導(dǎo)響應(yīng)時間表達(dá)式,并對傳感器響應(yīng)特性進(jìn)行數(shù)值仿真,仿真結(jié)果顯示:傳感器響應(yīng)時間只與熱敏元件的尺寸和材料有關(guān),與熱沉體無關(guān)。以0.5 mm紫銅作為熱敏元件的傳感器響應(yīng)時間可達(dá)1.2 ms左右;熱沉體吸熱系數(shù)越大,熱敏元件溫升越小,同時,隨著時間的增加,溫升速率逐漸減小。驗證試驗顯示,熱沉體的加入可有效降低熱敏元件溫升,所設(shè)計傳感器可正確反映入射熱流變化。
[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.
【作者單位】： 南京理工大學(xué)機(jī)械工程學(xué)院;
【基金】：國防科工局技術(shù)基礎(chǔ)科研項目(JSJL2014606B003)資助
【分類號】：TP212

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