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| Comparison and Analysis of Cook-Off Characteristics of Modular Charge in Gun Chamber at Two Low Firing Rates |
| Received:December 29, 2021 Revised:January 19, 2022 |
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| DOI：10.7643/issn.1672-9242.2022.03.005 |
| KeyWord:modular charge cook-off continuous firing gun chamber wall temperature |
| Author | Institution |
| QIAN Huan-yu |
School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing , China |
| YU yong-gang |
School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing , China |
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| Abstract: |
| To study the heating process of modular charge in gun chamber after multiple continuous firings, a two-dimensional transient cook-off model of modular charge retained in gun chamber was established with cook-off method. Taking 443 K as the critical temperature, the wall temperature distributions when the gun continuously fires until the temperature of the inner chamber wall reaches about 443 K are solved at two low firing rates of 2 rounds/min and 3 rounds/min, which are then adopted as the initial temperature. Based on that, the cook-off processes of modular charge in the chamber are numerically simulated to compare and discuss the cook-off characteristics of modular charge in gun chamber at two low firing rates. The results show that the temperature of the inner wall of the gun chamber reaches 444.3 K after 42 rounds at the firing rate of 2 rounds/min. The modular charge produces cook-off response after being retained in the chamber for 176.4 s with the cook-off response temperature of 484.2 K. When at 3 rounds/min, the inner wall temperature of the chamber reaches 444.3 K after 39 rounds, in which the modular charge produces cook-off response at 216.9 s with the temperature of 483.0 K. Under the two low firing rate conditions, the initial cook-off response positions of the modular charge are located in the upper right corner of the modular cartridge. The numerical results of cook-off off temperature are well consistent with the experimental results. The model is proved to be able to analyze the cook-off problem of modular charge in the chamber, and the firing rate has a certain influence on the cook-off characteristics of modular charge retained in gun chamber. |
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