Pulsation mode of transient flow behavior may occur in a violent manner in case of spiked cylinders depending on the geometry, type of spikes, and free stream conditions. Drastic pressure fluctuations near the face of the afterbody have been observed in most cases of pulsating flow mode and thus resulting in drastic variations in the coefficient of drag of the spiked body. The transient analysis of variations in C_d with spike length for various spiked cylinders have been carried out in the current work. The variations in C_d during one complete cycle as well as variations in time-averaged value of C_d with increase in L/D ratios have been analyzed. These variations have been explained with respect to the localized pressure fluctuations, shift in foreshock–aftershock interaction region, effect of effective shielding, and increasing spike lengths. It was found that aerodisk spiked cylinder had the least time-averaged C_d. The C_d for various other spiked bodies has also been summarized over a range of feasible spike lengths and an optimum design of the spiked body in terms of the spike shape and L/D has also been suggested.

在气瓶出现尖峰的情况下，瞬态流动行为的脉冲模式可能会剧烈发生，具体取决于几何形状，尖峰类型和自由流条件。在脉动流模式的大多数情况下，观察到后车身表面附近的剧烈压力波动，因此导致加长杆体的阻力系数发生急剧变化。在当前的工作中，已经对各种尖峰气缸的C _d随尖峰长度的变化进行了瞬态分析。在变型C ^ _d在一个完整周期中的时间平均值以及变化Ç _d与在增加大号/ d比率已被分析。这些变化已针对局部压力波动，前震与余震相互作用区域的偏移，有效屏蔽的作用以及尖峰长度的增加进行了解释。结果发现，加长销钉的气瓶的C _d最小。还对各种其他尖钉体的C _d进行了总结，总结了一系列可行的尖钉长度，并建议了尖钉体在尖钉形状和L / D方面的最佳设计。