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“飞溅”对力学效应影响实验研究
Experimental study on influence of splashing behavior on mechanical effects
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摘要: 激光辐照液态工质，在激光能量密度较高时将出现特有的“飞溅”现象，该过程消耗了大量的工质。选取室温下甘油作为实验研究对象，针对烧蚀甘油发生飞溅过程中产生的力学效应，设计了流场显示和推力测量集成装置，使用 YAG激光作为能量源，对甘油进行烧蚀。将得到的流场测量结果与推力曲线比对，找到发生飞溅对应的推力曲线部分，积分计算甘油发生飞溅对烧蚀总冲量贡献的比例。结果表明飞溅所消耗的大量甘油工质使用效率极低，未带来相应的冲量，是液态工质比冲过低的主要原因。因此，在以液体为工质的激光烧蚀推进技术中必须克服飞溅现象。最后给出一种通过碳掺杂来控制液体飞溅的方法，结果表明碳掺杂可以有效减少液体飞溅。Abstract: Theliquidsplashingphenomenonoccurswhentheliquidisirradiatedbylaser,whichconsumesalargeamountof liquid.The influence of splashing behavior on mechanical effects is researched in this paper.Aiming at the analyzing of mechanical effects in glycerol splashing,the flow field visualization and thrust measurement device are designed.The glycerol is ablated using the YAG laser.The splash part contained in the thrust curve can be obtained,and its proportion of contribution to the total im-pulse can be calculated by integrating the thrust curve over time.The experiment results show that large amounts of splash pro-duce few impulses.Besides,the splashing behavior is the main reason for the low specific impulse of liquid as it wastes large a-mount of liquid.Finally,a new method for reducing splashing by ablating carbon-doped liquid is proposed.The experiment is to demonstrate the validity and capability of the proposed method.
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