火箭推进

为研究激光选区熔化技术应用于大尺寸液体火箭发动机喷注器的可行性及最佳方案,按照先喷注单元后大尺寸喷注器的思路开展了设计研究。基于激光选区熔化技术设计了4种不同方案的喷注单元试验件,并进行了冷态液流试验对比。通过喷注单元对比试验得出直接采用激光选区熔化技术成型的喷嘴不适合直接用于大尺寸喷注器设计。根据喷注单元对比结果,选择了大尺寸喷注器的设计方案,生产了大尺寸喷注器,并进行了热试验考核。结果表明:采用激光选区熔化技术成型毛坯、机加工关键尺寸的设计方案为大尺寸喷注器的最佳方案。

In order to study the feasibility and the optimum scheme of selective laser melting technology applied to the injector of large dimensions liquid rocket engine, the design research was carried out according to the idea of injection unit first and then large dimensions injector. Four different schemes of injection unit test pieces were designed based on selective laser melting technology, and the cold flow test was carried out and the results were compared. Through the comparative test of injection unit, it was concluded that the injector formed by selective laser melting technology was not suitable for the design of large dimensions injector directly. According to the comparison results of the injection unit, the design scheme of the large dimensions injector was selected, the large dimensions injector was produced, and the liquid flow test and hot-fire test were carried out. The results show that the design scheme of forming blank and machining key dimensions by selective laser melting technology is the best scheme for large dimensions injector.

引言
1 喷注器SLM优化方案
2 喷注单元设计、生产与试验
3 喷注器设计、生产与试验
4 结论

图1 传统工艺喷注器局部结构示意图<br/>Fig.1 Local structure diagram of injector produced by traditional process

图1 传统工艺喷注器局部结构示意图
Fig.1 Local structure diagram of injector produced by traditional process

图2 燃料喷嘴与氧化剂喷嘴螺纹连接结构示意图<br/>Fig.2 Structure diagram of thread connection between fuel nozzle and oxidizer nozzle

图2 燃料喷嘴与氧化剂喷嘴螺纹连接结构示意图
Fig.2 Structure diagram of thread connection between fuel nozzle and oxidizer nozzle

图3 燃料喷嘴与氧化剂喷嘴一体设计结构示意图<br/>Fig.3 Structure diagram of integrated design of fuel nozzle and oxidizer nozzle

图3 燃料喷嘴与氧化剂喷嘴一体设计结构示意图
Fig.3 Structure diagram of integrated design of fuel nozzle and oxidizer nozzle

表1 喷注单元设计状态<br/>Tab.1 Design state of injection unit

表1 喷注单元设计状态
Tab.1 Design state of injection unit

图4 喷注单元产品照片<br/>Fig.4 Product photos of injection unit

图4 喷注单元产品照片
Fig.4 Product photos of injection unit

图5 喷注单元氧化剂路相对流量系数对比<br/>Fig.5 Comparison of relative flow coefficient of oxidizer path in injection unit

图5 喷注单元氧化剂路相对流量系数对比
Fig.5 Comparison of relative flow coefficient of oxidizer path in injection unit

图6 喷注单元燃料路相对流量系数对比<br/>Fig.6 Comparison of relative flow coefficient of fuel path in injection unit

图6 喷注单元燃料路相对流量系数对比
Fig.6 Comparison of relative flow coefficient of fuel path in injection unit

图7 喷注器增材制造产品照片<br/>Fig.7 Photos of injector products with additive manufacturing products

图7 喷注器增材制造产品照片
Fig.7 Photos of injector products with additive manufacturing products

图8 支撑开裂位置<br/>Fig.8 Cracking position of support

图8 支撑开裂位置
Fig.8 Cracking position of support

图9 试车相对压力曲线<br/>Fig.9 Relative pressure curve in hot-fire test

图9 试车相对压力曲线
Fig.9 Relative pressure curve in hot-fire test

图10 氧喷前高频压力测点短时傅里叶变换图<br/>Fig.10 STFT of high-frequency pressure before oxygen injecting

图10 氧喷前高频压力测点短时傅里叶变换图
Fig.10 STFT of high-frequency pressure before oxygen injecting

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备注

引言

1 喷注器SLM优化方案

2 喷注单元设计、生产与试验

3 喷注器设计、生产与试验

4 结论

期刊信息