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Obturator and detonation experiments in the subdetonative ram accelerator

机译：亚爆轰油门加速器的闭塞与爆轰实验

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摘要

An experimental investigation has been undertaken to improve understanding of the role of the obturator and detonations in the subdetonative ram accelerator starting process. Ram accelerator start experiments were conducted with various obturator geometries to determine the obturator dynamics and assess its effect on the outcome of a start attempt. The obturator rapidly decelerates upon entrance and then moves backwards. Reversal of direction occurs more rapidly after propellant ignition, for less massive obturators, and solid geometries. Perforated geometries and decreasing obturator mass are less conducive to igniting a given propellant, as evidenced by the flowfield and start attempt outcome data presented. Wave unstarts were observed to occur with and without detonations, indicating more than one mechanism responsible for this type of start failure. Piston-initiated detonation experiments were conducted by firing the obturators without the ram accelerator projectile. The piston experiments identified the detonation limits for a wide range of propellants, but were found to not always be indicative of the upper Mach number at which a ram accelerator can be successfully started. In some instances a successful start or wave fall-off would occur at Mach numbers above which a piston alone detonated the propellant. Thus, the projectile can play a mitigating role in detonation initiation and use of piston detonation limits to quantitatively define a detonation wave unstart limit was not realized.
机译：已经进行了一项实验研究，以增进对充填器和爆炸在亚爆轰油门加速器启动过程中的作用的了解。 Ram加速器启动实验是通过各种密闭器几何形状进行的，以确定密闭器的动力学特性，并评估其对启动尝试结果的影响。填塞器在进入时会迅速减速，然后向后移动。推进剂点火后，对于较小的闭塞器和实体几何形状，方向反转发生得更快。流场和开始尝试结果数据表明，打孔的几何形状和闭孔器质量的降低不利于点燃给定的推进剂。观察到有和没有爆震时都发生了波不发动，这表明导致这种类型的起步失败的原因不止一种。活塞引发的爆炸实验是通过发射没有冲压加速器射弹的密闭装置来进行的。活塞实验确定了各种推进剂的爆炸极限，但发现它们并不总是指示可成功启动冲压加速器的马赫数上限。在某些情况下，成功的起步或波降会以马赫数发生，超过该马赫数，仅活塞会引爆推进剂。因此，弹丸可在爆炸起爆中发挥缓解作用，并且未实现使用活塞起爆极限来定量地定义起爆波的起步极限。

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