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首页> 外文会议>AIAA/ASCE/AHS/ASC structures, structural dynamics and materials conference;AIAA SciTech Forum >Flow Properties through a Ballistically Generated Orifice During a Hydrodynamic Ram Event
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Flow Properties through a Ballistically Generated Orifice During a Hydrodynamic Ram Event

机译：在流体动力Ram事件中通过弹道产生的孔的流动特性

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摘要

Hydrodynamic ram, or HRAM, creates potential damage to aircraft via two mechanisms. The first mechanism is the resultant pressure fluctuations causing structural damage to the aircraft. The second mechanism is the increased probability of on-board aircraft fire due to fuel spurt via the resulting orifice. The HRAM cavity contributes to the ejected fluid and has shown correlation to various spurt properties. Knowledge of HRAM cavity properties can provide further understanding on the timing of the liquid spurt. Previous work on HRAM events measured the flow rate of ambient gases through the penetration orifice and into HRAM cavity providing information about the cavity composition. However, the orifice flow coefficient during this process was not well documented. Orifices generated during an HRAM event tend to have circular geometries but posses additional irregularities associated with the petaling of the aluminum wall. These irregularities contrast with traditional orifices. This research looks to determine the effect of projectile velocities, ranging from 110 to 172 m/s, has on orifice formation and to characterize the flow properties and flow coefficients for various mass flow rates.
机译：流体动力撞锤或HRAM通过两种机制对飞机造成潜在损害。第一种机制是所产生的压力波动，这会导致飞机结构损坏。第二种机制是由于燃油通过喷口喷出而导致机上飞机起火的可能性增加。 HRAM腔有助于喷射的流体，并显示出与各种喷射特性的相关性。 HRAM腔属性的知识可以提供对液体喷射时间的进一步了解。先前有关HRAM事件的工作测量了穿过穿透孔并进入HRAM腔室的环境气体的流速，从而提供了有关腔室成分的信息。但是，该过程中的孔口流量系数没有得到很好的记录。在HRAM事件期间生成的孔口往往具有圆形的几何形状，但具有与铝壁的花瓣状相关的其他不规则性。这些不规则与传统孔口形成对比。这项研究旨在确定射弹速度（从110到172 m / s）对孔形成的影响，并表征各种质量流率下的流动特性和流动系数。

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