This research addresses aerodynamic drag reduction in modular flying vehicles through a novel nested configuration design that optimizes aerodynamic matching between the cabin,driving module,and flight module.CFD simu...This research addresses aerodynamic drag reduction in modular flying vehicles through a novel nested configuration design that optimizes aerodynamic matching between the cabin,driving module,and flight module.CFD simulation methods were employed to analyze and compare the aerodynamic characteristics of nested and suspended configurations during flight mode.The numerical simulation results indicate that,compared to the suspended configuration flying vehicle developed by Airbus,the overall drag coefficient decreased from 0.7399 to 0.3417,representing a 53.82%reduction and demonstrating substantial improvement in aerodynamic performance.These findings provide valuable insights for configuration optimization and low-drag design of modular flying vehicles,offering significant potential for practical applications.展开更多
The increase in aerodynamic drag brings high energy consumption,which is a critical issue in the development of high-speed trains.Inspired by the excellent hydrodynamic characteristics of fish movement in nature,a two...The increase in aerodynamic drag brings high energy consumption,which is a critical issue in the development of high-speed trains.Inspired by the excellent hydrodynamic characteristics of fish movement in nature,a two-dimensional numerical simulation method based on spring-smoothing model and adaptive mesh technology was utilized to explore the effects of different fishtail structures and two flexible motion modes(Eel mode and Lunate-tail mode)on the wake of high-speed trains,and to assess their potential for aerodynamic drag reduction.Results indicate that the biomimetic fishtail successfully suppresses the alternating shedding of vortices in the wake,and induces the aerodynamic drag fluctuation period to align with the fishtail oscillation period.The fishtail length,oscillation mode,and frequency have a significant impact on the wake flow and aerodynamic drag of the train.Among these,a 1850 mm Eel fishtail with parameters ofλ=1 and T=8 s achieves the optimal drag reduction effect,with drag reduction rates of 39.12%and 26.00%for the tail car and the entire train,respectively.These findings provide a theoretical basis for the design of new low-resistance railway trains,promoting the sustainable development of rail transit towards goals of high-speed and energy-efficient.展开更多
文摘This research addresses aerodynamic drag reduction in modular flying vehicles through a novel nested configuration design that optimizes aerodynamic matching between the cabin,driving module,and flight module.CFD simulation methods were employed to analyze and compare the aerodynamic characteristics of nested and suspended configurations during flight mode.The numerical simulation results indicate that,compared to the suspended configuration flying vehicle developed by Airbus,the overall drag coefficient decreased from 0.7399 to 0.3417,representing a 53.82%reduction and demonstrating substantial improvement in aerodynamic performance.These findings provide valuable insights for configuration optimization and low-drag design of modular flying vehicles,offering significant potential for practical applications.
基金Project(2025A1515011803)supported by the Guangdong Basic and Applied Basic Research Foundation,ChinaProject(2023JC01020)supported by the Jiangmen Basic and Theoretical Science Research Plan,China。
文摘The increase in aerodynamic drag brings high energy consumption,which is a critical issue in the development of high-speed trains.Inspired by the excellent hydrodynamic characteristics of fish movement in nature,a two-dimensional numerical simulation method based on spring-smoothing model and adaptive mesh technology was utilized to explore the effects of different fishtail structures and two flexible motion modes(Eel mode and Lunate-tail mode)on the wake of high-speed trains,and to assess their potential for aerodynamic drag reduction.Results indicate that the biomimetic fishtail successfully suppresses the alternating shedding of vortices in the wake,and induces the aerodynamic drag fluctuation period to align with the fishtail oscillation period.The fishtail length,oscillation mode,and frequency have a significant impact on the wake flow and aerodynamic drag of the train.Among these,a 1850 mm Eel fishtail with parameters ofλ=1 and T=8 s achieves the optimal drag reduction effect,with drag reduction rates of 39.12%and 26.00%for the tail car and the entire train,respectively.These findings provide a theoretical basis for the design of new low-resistance railway trains,promoting the sustainable development of rail transit towards goals of high-speed and energy-efficient.
