Numerical simulation for near-field characteristics of air explosion under different degrees of vacuum

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (17) : 270-276.

LI Kebin1, LI Xiaojie1,2, YAN Honghao1, WANG Xiaohong1, YANG Chenchen1

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Abstract

External environment variation makes shock wave propagation of air explosion produce obvious changes. In order to analyze the influence of degree of vacuum on near-field characteristics of air explosion,the finite element model of a free-field air explosion was established. Based on Sachs scaling law,introducing the characteristic scaled distance Z,the variation laws of explosion near-field characteristic parameters under various vacuum degrees were analyzed. Results indicated that the piecewise function taking Hopkinson scaled distance and the characteristic scaled distance Z as variables can express the explosion peak pressure Δpm within the full range of different degrees of vacuum; the variation of specific impulse i and positive pressure action time t+ is non-monotonic and closely related to sparse wave tail discontinuity surface of detonation product; time history curves of detonation product’s interface and shock wave front under different degrees of vacuum are overlapped,respectively in a dimensionless coordinate system,and the ultimate expansion volume is linearly related to critical distance Rs.

Key words

explosion in air / vacuum environment / near-field characteristic parameters / sparse wave tail discontinuity surface / characteristic scaled distance

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LI Kebin1, LI Xiaojie1,2, YAN Honghao1, WANG Xiaohong1, YANG Chenchen1. Numerical simulation for near-field characteristics of air explosion under different degrees of vacuum[J]. Journal of Vibration and Shock, 2018, 37(17): 270-276

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