Study on the Influence of Spiracle on the Flow Field of Tubular Cartridge
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摘要:针对某机载爆炸螺栓在实验中出现的振动疲劳断裂问题，以该爆炸螺栓的实际结构和使用工况为研究对象，采用频域法对振动疲劳寿命进行了计算与评估，得出了适用于该工况下爆炸螺栓的振动疲劳寿命计算模型。将计算结果与随机振动实验结果进行对比，结果表明频域Dirlik法计算结果更接近实验结果，计算误差在50%以内，因此，Dirlik法可用于该工况下爆炸螺栓的振动疲劳寿命计算。
Abstract:Aimed at some hood-throwing separated rocket, in order to explore whether the internal flow field of the combustion chamber meets the requirements of reliable and stable operation of the product as the tubular suit-type charge burning, the simulation calculation and ground ignition test research were carried out. The simulation results show that the fire-to-fuel ratio between different grains of the packaged drug type is quite different, and the internal flow field pressure is unbalanced, which result in a large difference between the pressure vs time curve and the design curve. While adding vent holes between the columns can effectively improve the problem, but as the total area of the vent holes increases, the initial pressure peak will also increase, and the static ignition test results are consistent with the simulation calculation results.
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