Nested Combustion Chamber Buffer Structure and Its Energy Absorption Characteristics

SUN Menghua; ZHAN Tingbian; ZHAO Heming; LI Xiaojun; DONG Yingjuan

doi:10.7643/ issn.1672-9242.2025.12.010

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (12) : 78-85. DOI: 10.7643/ issn.1672-9242.2025.12.010

Key Projects Equipment

Nested Combustion Chamber Buffer Structure and Its Energy Absorption Characteristics

SUN Menghua^1,2, ZHAN Tingbian^2,*, ZHAO Heming¹, LI Xiaojun³, DONG Yingjuan⁴

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Abstract

To address the issue that nested combustion chambers are prone to structural failure under extreme aerodynamic impact conditions, the work aims to investigate the energy absorption characteristics of thin-walled metal tube buffer structures and enhance their cushioning performance through multi-parameter optimization design, thereby providing theoretical support for equipment safety protection under high-overload conditions. The finite element software LS-DYNA was used to conduct numerical simulation on 15 sets of thin-walled metal tubes with different structural parameters and the effects of different cone angles (ranging from 7° to 25°) and different materials (including 2A12T4 aluminum alloy, 7075 aluminum alloy, and 45^#steel) on the cushioning performance were studied. An analytical model of the expansion force was established based on plastic deformation theory, and key parameters such as the buffer force-stroke curve and energy absorption efficiency (I) were obtained through numerical simulation, with the control variable method employed to analyze the effects of various parameters on the energy absorption characteristics. A three-stage buffering process of fluctuation, stabilization, and stasis appeared. In the fluctuation stage, the buffer force rapidly decayed from a peak of 35.9-57.8 kN and remained relatively constant during the stabilization stage. Specifically, at a 20° cone angle, the 7075 aluminum alloy specimen (group J24) exhibited the optimal performance, with an average buffer force of 27.514 kN (a 109.3% improvement over the 7° cone angle specimen) and an energy absorption efficiency of 89.55%. Material performance analysis indicated that the 7075 aluminum alloy with a yield strength of 505 MPa showed a 41.2% increase in load-bearing capacity compared to 2A12-T4 (325 MPa), while the 45# steel exhibited a 62.8% reduction in mass-specific energy absorption efficiency due to its higher density. In conclusion, the combination of a 20° cone angle and 7075 aluminum alloy offers the best comprehensive energy absorption performance, and the findings reveal the mechanism through which cone angle and material properties affect buffer characteristics, providing a critical basis for the optimized design of buffer systems in nested combustion chambers. Future work should focus on fatigue damage mechanisms and the optimization of composite structures.

Key words

nested combustion chamber / buffer structure / thin-walled metal tube / energy absorption characteristics / numerical simulation / parameter optimization / high-overload protection

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SUN Menghua, ZHAN Tingbian, ZHAO Heming, LI Xiaojun, DONG Yingjuan. Nested Combustion Chamber Buffer Structure and Its Energy Absorption Characteristics[J]. Equipment Environmental Engineering. 2025, 22(12): 78-85 https://doi.org/10.7643/ issn.1672-9242.2025.12.010

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