Purpose

A model for calculating the global overpressure time history of a single cloud detonation from overpressure time history of discrete positions in the range of single cloud detonation is to be proposed and verified. The overpressure distribution produced by multiple cloud detonation and the influence of cloud spacing and fuel mass of every cloud on the overpressure distribution are to be studied.

Design/methodology/approach

A calculation method is used to obtain the global overpressure field distribution after single cloud detonation from the overpressure time history of discrete distance to detonation center after single cloud detonation. On this basis, the overpressure distribution produced by multi-cloud under different cloud spacing and different fuel mass conditions is obtained.

Findings

The results show that for 150 kg fuel, when the spacing of three clouds is 40 m, 50 m, respectively, the overpressure range of larger than 0.1 MPa is 5496.48 mˆ2 and 6235.2 mˆ2, which is 2.89 times and 3.28 times of that of single cloud detonation. The superposition effect can be ignored when the spacing between the three clouds is greater than 60 m. In the case of fixed cloud spacing, once the overpressure forms continuous effective superposition, the marginal utility of fuel decreases.

Originality/value

A model for calculating the global overpressure time history of a single cloud detonation from overpressure time history of discrete positions in the range of single cloud detonation is proposed and verified. Based on this method, the global overpressure field of single cloud detonation is reconstructed, and the superimposed overpressure distribution characteristics of three cloud detonation are calculated and analyzed.

中文翻译：

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多重云爆炸冲击波超压的数值计算

目的

提出并验证了一种根据单云爆炸范围内离散位置的超压时程计算单云爆炸全局超压时程的模型。研究多云爆炸产生的超压分布以及云距和各云燃料质量对超压分布的影响。

设计/方法论/途径

采用计算方法，从单云爆轰后距爆中心离散距离的超压时程得到单云爆炸后全局超压场分布。在此基础上，得到了不同云距、不同燃料质量条件下多云产生的超压分布。

发现

结果表明，对于150 kg燃料，当三云间距分别为40 m、50 m时，大于0.1 MPa的超压范围分别为5496.48 m^2和6235.2 m^2，分别是单个云的2.89倍和3.28倍。云爆炸。当三云间距大于60 m时，叠加效应可以忽略不计。在云间距固定的情况下，一旦超压形成连续有效叠加，燃料的边际效用就会下降。

原创性/价值

提出并验证了一种根据单云爆炸范围内离散位置的超压时程计算单云爆炸全局超压时程的模型。基于该方法，重建了单云爆炸的全局超压场，并计算分析了三云爆炸的叠加超压分布特征。