Abstract In order to ensure the safety and reliability of weapons, it is very important to grasp the influence of the inside and outside diameters of the shell on the delay time. In this paper, a fluid–solid coupling model is established for a metal baffle-type delay element with a silicon-based delay composition. The combustion flow field of the delay element with the inside diameter of 3, 4, and 5 mm is simulated by the Star-CD software. Then a new method is proposed to calculate the delay time of the heat conduction delay element. The influence of the internal and external diameters on the delay time of the thermal conduction delay element is studied. The results show that the temperature of the ignition composition gradually increases due to the heat conductivity of the metal baffle after burning of the delay composition, and the highest temperature is reached at the centre of the ignition composition. The influence of the size of the inside and outside diameters on the delay time has a critical equilibrium point, which may be related to the balance between the combustion heat increment and the heat loss.

中文翻译：

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导热延迟元件延迟时间计算新方法

摘要 为了保证武器的安全性和可靠性，掌握炮弹内外径对延迟时间的影响非常重要。本文建立了具有硅基延迟成分的金属挡板型延迟元件的流固耦合模型。内径为3、4、5 mm的延迟元件的燃烧流场由Star-CD软件模拟。然后提出了一种计算导热延迟元件延迟时间的新方法。研究了内外径对热传导延迟元件延迟时间的影响。结果表明，延迟组合物燃烧后，由于金属挡板的导热，点火组合物的温度逐渐升高，并且在点火成分的中心达到最高温度。内外径大小对延迟时间的影响有一个临界平衡点，这可能与燃烧热增量和热损失的平衡有关。