Modeling of the whole process of shock wave overpressure of free-field air explosion
The waveform of the explosion shock wave under free-field air explosion is an extremely complex problem. It is generally considered that the waveform consists of overpressure peak, positive pressure zone and negative pressure zone. Most of current practice usually considers only the positive pressur...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2019-10-01
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| Series: | Defence Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214914719300753 |
| _version_ | 1830308777375563776 |
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| author | Zai-qing Xue Shunping Li Chun-liang Xin Li-ping Shi Hong-bin Wu |
| author_facet | Zai-qing Xue Shunping Li Chun-liang Xin Li-ping Shi Hong-bin Wu |
| author_sort | Zai-qing Xue |
| collection | DOAJ |
| description | The waveform of the explosion shock wave under free-field air explosion is an extremely complex problem. It is generally considered that the waveform consists of overpressure peak, positive pressure zone and negative pressure zone. Most of current practice usually considers only the positive pressure. Many empirical relations are available to predict overpressure peak, the positive pressure action time and pressure decay law. However, there are few models that can predict the whole waveform. The whole process of explosion shock wave overpressure, which was expressed as the product of the three factor functions of peak, attenuation and oscillation, was proposed in the present work. According to the principle of explosion similarity, the scaled parameters were introduced and the empirical formula was absorbed to form a mathematical model of shock wave overpressure. Parametric numerical simulations of free-field air explosions were conducted. By experimental verification of the AUTODYN numerical method and comparing the analytical and simulated curves, the model is proved to be accurate to calculate the shock wave overpressure under free-field air explosion. In addition, through the model the shock wave overpressure at different time and distance can be displayed in three dimensions. The model makes the time needed for theoretical calculation much less than that for numerical simulation. Keywords: Air explosion, Shock wave overpressure, Free field, Experimental verification, Numerical simulation |
| first_indexed | 2024-12-19T10:56:12Z |
| format | Article |
| id | doaj.art-432daead762041ef9c92e36524c9b7fa |
| institution | Directory Open Access Journal |
| issn | 2214-9147 |
| language | English |
| last_indexed | 2024-12-19T10:56:12Z |
| publishDate | 2019-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Defence Technology |
| spelling | doaj.art-432daead762041ef9c92e36524c9b7fa2022-12-21T20:24:49ZengKeAi Communications Co., Ltd.Defence Technology2214-91472019-10-01155815820Modeling of the whole process of shock wave overpressure of free-field air explosionZai-qing Xue0Shunping Li1Chun-liang Xin2Li-ping Shi3Hong-bin Wu4Beijing Institute of Space Long March Vehicle, Beijing, 100076, ChinaCorresponding author.; Beijing Institute of Space Long March Vehicle, Beijing, 100076, ChinaBeijing Institute of Space Long March Vehicle, Beijing, 100076, ChinaBeijing Institute of Space Long March Vehicle, Beijing, 100076, ChinaBeijing Institute of Space Long March Vehicle, Beijing, 100076, ChinaThe waveform of the explosion shock wave under free-field air explosion is an extremely complex problem. It is generally considered that the waveform consists of overpressure peak, positive pressure zone and negative pressure zone. Most of current practice usually considers only the positive pressure. Many empirical relations are available to predict overpressure peak, the positive pressure action time and pressure decay law. However, there are few models that can predict the whole waveform. The whole process of explosion shock wave overpressure, which was expressed as the product of the three factor functions of peak, attenuation and oscillation, was proposed in the present work. According to the principle of explosion similarity, the scaled parameters were introduced and the empirical formula was absorbed to form a mathematical model of shock wave overpressure. Parametric numerical simulations of free-field air explosions were conducted. By experimental verification of the AUTODYN numerical method and comparing the analytical and simulated curves, the model is proved to be accurate to calculate the shock wave overpressure under free-field air explosion. In addition, through the model the shock wave overpressure at different time and distance can be displayed in three dimensions. The model makes the time needed for theoretical calculation much less than that for numerical simulation. Keywords: Air explosion, Shock wave overpressure, Free field, Experimental verification, Numerical simulationhttp://www.sciencedirect.com/science/article/pii/S2214914719300753 |
| spellingShingle | Zai-qing Xue Shunping Li Chun-liang Xin Li-ping Shi Hong-bin Wu Modeling of the whole process of shock wave overpressure of free-field air explosion Defence Technology |
| title | Modeling of the whole process of shock wave overpressure of free-field air explosion |
| title_full | Modeling of the whole process of shock wave overpressure of free-field air explosion |
| title_fullStr | Modeling of the whole process of shock wave overpressure of free-field air explosion |
| title_full_unstemmed | Modeling of the whole process of shock wave overpressure of free-field air explosion |
| title_short | Modeling of the whole process of shock wave overpressure of free-field air explosion |
| title_sort | modeling of the whole process of shock wave overpressure of free field air explosion |
| url | http://www.sciencedirect.com/science/article/pii/S2214914719300753 |
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