| 过冷大水滴相继撞壁对结冰影响的实验研究 |
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| 引用本文： | 徐弘,孔维梁,王福新,刘洪.过冷大水滴相继撞壁对结冰影响的实验研究[J].实验流体力学,2018,32(2):28-34. |
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| 作者姓名： | 徐弘 孔维梁 王福新 刘洪 |
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| 作者单位： | 上海交通大学 航空航天学院, 上海 200240 |
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| 摘 要： | 目前过冷大水滴（SLD）撞击结冰机理未能清楚解释SLD间的相互干扰对撞击结冰过程的影响。实验用高速相机拍摄双SLD偏移一定位置相继撞击壁面结冰的物理过程，研究双SLD落点间的偏移、相继撞击的时间间隔对结冰形态及结冰速度的影响。实验表明:双SLD间的相互干扰会抑制撞击后的回缩行为进而影响结冰形态，降低结冰速度，延长双SLD完全冻结时间:双SLD落点位置偏移量的大小对结冰形态和结冰速度的影响均很大，相继撞击时间间隔的长短对结冰形态影响不大，主要影响结冰速度。
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| 关 键 词： | 过冷大水滴 撞击结冰 偏移 时间间隔 结冰形态 结冰速度 |
| 收稿时间： | 2017-08-29 |
Experimental study on the effects of successive supercooled large droplets impacting |
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| Affiliation: | School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | The understanding of the impacting-icing mechanism of supercooled large droplet (SLD) is still limited to a single SLD. The interactions between droplets have not been taken into consideration. A high-speed camera is used to record the impacting-freezing process of two SLDs that are offset a certain distance away from each other and successively impact on the substrate. The experiment studies the relationship between the offsets of two SLDs, the time intervals of successive impacts and the freezing morpholog as well as the freezing speed. The experiment shows that the interactions between SLDs can inhibit the SLD shrinkage behavior and prolong the freezing time. The size of the offset affects the shrinkage rate which decides the final freezing morphology. The freezing time of two SLDs decreases rapidly with the slight increase of the offset of two SLDs in a small range. The time interval of the successive impacts is inversely proportional to the freezing time and has a weak effect on the formation of the freezing morphology. |
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