Ignition theory investigation and experimental research on hybrid rocket motor

Tian, Hui; Li, Xintian; Cai, Guobiao

doi:10.1016/j.ast.2015.01.015

Cited by 21 publications

(2 citation statements)

References 13 publications

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“…This is because the laser focus is on the surface of the sample at the beginning of the ablation; as a result, the depth of the microgroove increases rapidly with the increase in the number of scanning layers in the initial stage (1). With an increase in the depth of the microgroove, the spot affected on the material becomes defocused, resulting in the depth of the microgroove ablation no longer increasing significantly with additional scanning layers, as shown in region (2). More importantly, 80 scanning layers corresponded to the 70 µm microgroove (indicated by the yellow circle in Figure 6), which was the required laser ablation parameter, and the three-dimensional morphology of the microgrooves was obtained by confocal microscopy.…”

Section: Morphology Of Laser-ablated Microgroovesmentioning

confidence: 99%

“…When the engine is working, the high-pressure gas produced by the initiating explosive device breaks through the diaphragm to start the engine. Therefore, the ventilation rate of bursting discs after breaking has an important influence on whether the rocket engine can start smoothly and on the starting effect [2]. The rupture effect of the metal diaphragm is realized by engraving a specially shaped microgroove on its surface.…”

Section: Introductionmentioning

confidence: 99%

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Process Research on the Microgroove Depth Uniformity of Bursting Discs Using Femtosecond Lasers

Jiang

Xie

2022

Coatings

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This study proposes an ultrafast laser ablation method for improving the depth uniformity of microgrooves in bursting discs. Under a lower laser fluence, the influence of the spot overlap rate on the depth uniformity of microgrooves was studied. The results show that 80% of the spot overlap ratio has good performance in ablation efficiency and depth uniformity of microgrooves. On this basis, the relationship between the number of laser scanning layers and the depth of microgrooves was studied, and the number of scanning layers needed to ablate 70 µm microgrooves was obtained. Based on the combination of the process parameters and the optimization of the laser scanning path, laser ablation of bursting disc microgrooves with a specific shape was realized. The depth uniformity of microgrooves in different sections of the bursting disc was not worse than 4 µm. The preliminary bursting test shows that the bursting pressure between the discs was no more than 0.06 Mpa. Compared with the results of the traditional processing method, the microgroove depth uniformity of bursting discs was greatly improved. Therefore, femtosecond laser ablation technology provides an advanced manufacturing method for bursting disc microgroove machining.

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Section: Morphology Of Laser-ablated Microgroovesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%