Theoretical and numerical studies on the scale effects for strong explosion fireball thermal radiation characteristics
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摘要: 针对火球热辐射双脉冲极值特征问题，基于辐射流体热传导近似模型，理论推导了表征尺度效应的相似参数来界定热辐射极值特征的适用域。选取火球特征尺度和辐射自由程特征尺度差异较大的2类典型问题来验证尺度效应相似参数的有效性，并采用高精度Euler辐射流体计算程序来数值模拟火球热辐射对尺度效应相似参数的依赖性。理论和数值结果表明：尺度效应相似参数能较好描述不同条件下的火球热辐射演化规律，并可扩展到实验分析中；仅依靠爆炸高度来表征火球演化中的尺度效应存在一定局限性。Abstract: As a typical characteristic of fireball phenomena, thermal radiation plays an important role in damage assessments. Up to now, many studies of thermal radiation using theoretical, numerical, and experimental methods have been carried out and empirical formulas in forms of yield or density are constructed to feature the extremal characteristic of fireball thermal radiation. However, due to the combined action of radiation free path (RFP) and fireball characteristic length (FCL) it is difficult to identify these formula’s application scope and further theoretical studies are needed to take the scale effect (SE) into account. By radiation heat conduction approximation model under optical thickness assumption, scale effect similarity parameter (SESP) is theoretically derived and its scope of application is further verified by high-precision numerical method. The numerical code is developed within a framework of Euler method and adaptive mesh refinement method is employed to improve the precision in the radiation front. The results of theoretical analysis show that SESP is consistent with existed conclusions regarding the thermal radiation of fireball at different altitudes, and it can be applied to the analysis of laboratory scale fireball. Meanwhile, numerical results also show that both scale effects at different altitudes and laboratory scale can be characterized by SESP.
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图 1 爆炸当量为1 kt、爆炸高度为海平面高度时爆炸火球有效半径和有效温度随时间的变化规律(42群)
Figure 1. Effective temperature and radius of yield 1 kt explosion at sea level (42 Group)
图 2 爆炸当量1 kt、爆炸高度为海平面高度时爆炸火球半径和温度随时间的变化规律(单群)
Figure 2. Effective temperature and radius of yield 1 kt explosion at sea level (single group)
图 3 爆炸高度不同时尺度效应相似参数与密度的关系
Figure 3. Scale effect similarity parameter vs density at different altitudes
图 4 不同爆炸高度下火球的热辐射功率和有效半径
Figure 4. Thermal radiant power and effective radius at different altitudes
图 5 爆炸高度为35 km时不同爆炸当量下火球的热辐射功率和有效半径
Figure 5. Thermal radiant power and effective radius when altitude is 35 km for different yields
图 6 R0取0.2和0.5 mm时火球的热辐射功率和有效半径（hb=0）
Figure 6. Thermal radiant power and effective radius under different initial radius for laboratory scale fireball (hb=0)
图 7 R0取10.0和1.0 mm时火球的热辐射功率和有效半径( hb=20 km)
Figure 7. Thermal radiation power and effective radius under different initial radius for laboratory scale fireball (hb=20 km).
表 1 爆炸当量为1kt时不同爆炸高度下的尺度效应参数
Table 1. scale effect similarity parameter of yield 1kt at different altitudes
hb/(km) $ {\rho _{{h_b}}} $/(kg·m−3) LMFP/(m) LFB/(m) fscale 0 1.22 5.98×10−5 32.00 1.87×10−6 10 4.13×10−1 3.87×10−4 40.19 2.85×10−5 20 8.84×10−2 5.70×10−3 55.55 1.42×10−3 30 1.82×10−2 9.32×10−2 77.45 8.10×10−2 35 8.30×10−3 3.70×10−1 91.30 5.97×10−1 40 3.90×10−3 1.44 107.01 4.22 50 9.92×10−4 1.67×10 146.62 1.44×102 60 2.93×10−4 1.49×102 184.19 3.37×103 70 7.58×10−5 1.71×103 244.72 1.12×105 
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表 2 海平面高度时不同火球尺度所对应的尺度效应参数（hb=0）
Table 2. scale effect similarity parameter in different laboratory scales (hb=0)
R0/(m) $ {\rho _{{h_b}}} $/(kg·m−3) LMFP/m LFB/m fscale 2.81 1.225 5.98×10−5 32.00 1.87×10−6 1.00 1.225 5.98×10−5 9.86 6.07×10−6 1.00×10−1 1.225 5.98×10−5 7.14×10−1 8.37×10−5 1.00×10−2 1.225 5.98×10−5 5.17×10−2 1.16×10−3 1.00×10−3 1.225 5.98×10−5 3.75×10−3 1.60×10−2 5.00×10−4 1.225 5.98×10−5 1.70×10−3 3.52×10−2 2.00×10−4 1.225 5.98×10−5 5.98×10−4 1.00×10−1
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表 3 hb=20 km时不同火球尺度所对应的尺度效应参数
Table 3. scale effect similarity parameter in different laboratory scales (hb=20 km)
R0/m $ {\rho _{{h_b}}} $/(kg·m−3) LMFP/m LFB/m fscale 2.81 8.84×10−2 5.70×10−3 55.55 1.42×10−3 1.00 8.84×10−2 5.70×10−3 17.11 4.61×10−3 1.00×10−1 8.84×10−2 5.70×10−3 1.24 6.37×10−2 1.00×10−2 8.84×10−2 5.70×10−3 8.98×10−2 8.79×10−1 1.00×10−3 8.84×10−2 5.70×10−3 6.51×10−3 1.21×10 5.00×10−4 8.84×10−2 5.70×10−3 2.95×10−3 2.67×10 2.00×10−4 8.84×10−2 5.70×10−3 1.04×10−3 7.60×10
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