火箭推进

针对凝胶推进剂雾化困难的问题,引入静电喷射技术雾化凝胶推进剂。以水凝胶模拟液为介质,探究静电雾化技术的可行性及试验条件,当收集距离2～5 cm、供液速率10～30 μL/h时,凝胶模拟液可实现稳定雾化,收集液滴直径小于100 μm,散射角分布在8°～36°之间,收集液滴直径和散射角均随收集距离的增大和针管直径的减小而减小; 同样条件下,凝胶粘度越小,散射角和雾化液滴直径越小。在此基础上,针对单针管推力小的问题,分析使用多针管喷头进行凝胶推进剂静电雾化的可行性及其雾化区域分布,结果表明2号凝胶模拟液用于多喷头雾化可得到良好的雾化区域分布,适用于凝胶推进系统之中。

In view of the atomization difficulty of gelled propellant, electrostatic injection technology was introduced to atomize gelled propellant. The hydrogel simulant was taken as a medium to investigate the feasibility and experimental conditions of the electrostatic atomization technology. When the collection distance is 2～5 cm and the liquid flow rate is and 10～30 μL/h, the gelled simulant can achieve steady atomization. The diameter of collected droplets is less than 100 μm and the jet-spread angle distribution is 8°～36°. Meanwhile, the diameter of atomization droplets and the jet-spread angle decrease with the increase of collection distance and the decrease of nozzle diameter. Under the same conditions, the lower the viscosity of the gel is, the smaller the jet-spread angle and the diameter of atomization droplet become. On this basis, the feasibility of multi-nozzle structure to atomize the gelled propellant and the distribution of atomization area were analyzed for the problem of small thrust from a single nozzle. The results show that the No.2 gelled simulant used in the multi-nozzle structure can obtain a good distribution of atomization area, which is more suitable for gelled propulsion system.

引言
1 实验装置及测量方法
2 实验结果及分析
3 结论

图1 3种不同凝胶模拟液流变特性曲线:(a)T= 0 h;(b)T= 20 h <br/>Fig.1 Rheological characteristic curves of three different gelled simulants

图1 3种不同凝胶模拟液流变特性曲线:(a)T= 0 h;(b)T= 20 h
Fig.1 Rheological characteristic curves of three different gelled simulants

图2 静电雾化示意图<br/>Fig.2 Schematic of electrostatic atomization

图2 静电雾化示意图
Fig.2 Schematic of electrostatic atomization

表1 针管规格及其内外径<br/>Tab.1 Nozzle specification and its inner and outer diameters

表1 针管规格及其内外径
Tab.1 Nozzle specification and its inner and outer diameters

图3 临界电压与收集距离关系曲线<br/>Fig.3 Relationship between critical voltage and collection distance

图3 临界电压与收集距离关系曲线
Fig.3 Relationship between critical voltage and collection distance

图4 1号凝胶模拟液在不同收集距离时静电雾化液滴直径分布<br/>Fig.4 Diameter distribution of electrostatic atomization droplet of No.1 gelled simulant at different collection distances

图4 1号凝胶模拟液在不同收集距离时静电雾化液滴直径分布
Fig.4 Diameter distribution of electrostatic atomization droplet of No.1 gelled simulant at different collection distances

图5 2号凝胶模拟液在不同收集距离时静电雾化液滴直径分布<br/>Fig.5 Diameter distribution of electrostatic atomization droplet of No.2 gelled simulant at different collection distances

图5 2号凝胶模拟液在不同收集距离时静电雾化液滴直径分布
Fig.5 Diameter distribution of electrostatic atomization droplet of No.2 gelled simulant at different collection distances

图6 1号凝胶模拟液与2号凝胶模拟液的散射角分布<br/>Fig.6 Jet-spread angle distribution of No.1 gelled stimulant and No.2 gelled simulant

图6 1号凝胶模拟液与2号凝胶模拟液的散射角分布
Fig.6 Jet-spread angle distribution of No.1 gelled stimulant and No.2 gelled simulant

图7 7针管喷头结构及其静电雾化区域临界分布<br/>Fig.7 Seven-nozzle structure and its critical distribution in electrostatic atomization region

图7 7针管喷头结构及其静电雾化区域临界分布
Fig.7 Seven-nozzle structure and its critical distribution in electrostatic atomization region

图8 临界雾化角分布<br/>Fig.8 Distribution of critical jet-spread angle

图8 临界雾化角分布
Fig.8 Distribution of critical jet-spread angle

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备注

引言

1 实验装置及测量方法

2 实验结果及分析

3 结论

期刊信息