Experiment and numerical research on regression rate of hybrid rocket motor with single-port wagon wheel fuel grain

Wei, Tianfang; Cai, Guobiao; Meng, Xiangyu; Jiang, Xianzhu

doi:10.1016/j.actaastro.2023.03.021

Cited by 13 publications

(8 citation statements)

References 26 publications

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“…Meanwhile, the area of the oxidizer inlet end and outlet end is considerably larger than that of other parts of the grains. This size disparity primarily arises from surface combustion occurring at both ends of the grains. , …”

Section: Resultsmentioning

confidence: 99%

“…Cai, Wei, and co-workers , employed CT scan imaging to investigate the ablation rate of a copper nozzle and the irregular regression process occurring on the burning surfaces of wheel-shaped grains. This approach is also effective for measuring and evaluating the regression rate of spiral star grains being investigated in this research.…”

Section: Methodsmentioning

confidence: 99%

“…This size disparity primarily arises from surface combustion occurring at both ends of the grains. 26,38 Regression Rate Distribution. Figure 15 presents a comparison of the average regression rates at different axial locations for various geometry designs when the oxidant flow rate is set to 3.00 g/s (the average value is 2.99 g/s), analyzed utilizing CT digital image processing, as previously detailed.…”

Section: Setupmentioning

confidence: 99%

“…20−22 A variety of physical methods have been proposed to improve the regression rate, including the turbulence-induced grain configurations, multisection fuels, multistage injection of oxidizers, and swirl injection. 23−25 Tian et al conducted research on three-dimensional (3D) steady numerical simulation models for grains with complex geometries, 26,27 two-hole segmented grains, 28 and star-segmented rotation grains. 29 Their investigation involved studying the distribution of the regression rate through convective heat transfer calculations.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Because combustion in hybrid engines is predominantly influenced by the physical mass transfer process, designing flow field structures with intricate geometries can effectively enhance the regression rate by prolonging the residual time and improving the heat exchange process. − A variety of physical methods have been proposed to improve the regression rate, including the turbulence-induced grain configurations, multisection fuels, multistage injection of oxidizers, and swirl injection. − Tian et al conducted research on three-dimensional (3D) steady numerical simulation models for grains with complex geometries, , two-hole segmented grains, and star-segmented rotation grains . Their investigation involved studying the distribution of the regression rate through convective heat transfer calculations.…”

Section: Introductionmentioning

confidence: 99%

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Combustion Characteristics of Vat-Photopolymerized Fuels with a Spiral Star Port for Hybrid Propulsion

Chen,

Fu,

Yang

et al. 2024

Langmuir

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Despite hybrid rocket motors offering distinct advantages over solid or liquid rocket motors, their low regression rate and insufficient combustion efficiency remain significantly unimproved. This study focuses on the effects of the helix lead on the regression rate distribution and combustion efficiency of vat-polymerized fuel grains with a spiral star port for a hybrid rocket. Both experimental and numerical investigations were conducted to study the combustion characteristics and regression rate distribution of three-dimensional (3D) print grains. Spiral star grains with varying helix leads of 60, 90, and 120 mm were fabricated using light-curing 3D printing technology. A 3D simulation model was developed to obtain the temperature distribution, species mass distribution, and combustion efficiency. Furthermore, firing tests were performed on a two-dimensional radial hybrid combustion test stand to measure the regression rate. Digital image processing of computed tomography images was used to determine the regression rate. Simulation results indicated that the spiral star grain port helps to improve the combustion efficiency compared with those seen with round tube and straight star port grains. With an increase in the axial distance, the flame zone gradually shrinks, and the smaller the helix lead, the faster the shrinkage. At a mass flow rate of 1.50 g/s for oxygen, the regression rate of the spiral star grains is significantly higher than that of the straight star grain and the conventional round tubular grains, and the regression rate gradually increases with a decrease in the helix lead. This finding is expected to solve the problem of the low regression rate of solid fuels with spiral star pore-shaped grains prepared by the light-curing 3D printing method.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Setupmentioning

confidence: 99%