Scholarlink

<p>Aerodynamic and flow behaviors of axisymmetric bodies with blunt-based and boattail configurations are investigated under different angles of attack. Particular emphasis is placed on the influence of 20° boattail modifications incorporating longitudinal grooves on wake structure and drag behavior. The angle of attack was adjusted systematically from 0° to 25°, with data acquired through aerodynamic experiments and computational flow analysis. Experimental methods provided lift and drag data, while turbulence modeling in the numerical simulations utilized a two-equation <i>k</i>-<i>ω</i> SST approach within the RANS framework. The results show that longitudinal grooves promote flow reattachment and enhance base-pressure recovery at low angles of attack, yielding up to a 20 % reduction in drag compared with the smooth boattail configuration. However, the drag-reduction benefit progressively diminishes as the angle of attack increases. The modification of the drag is connected to the change of flow fields at the forebody and the near wake behind the base. Leeward side and longitudinal rear-end vortices are found to be typical features of the flow around the models. The interaction among the surface flow, wake region, skin-friction results and aerodynamic drag of the model is discussed. These insights provide guidance for the aerodynamic design of boattail bodies operating under off-design or maneuvering conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Angle of attack effect on aerodynamic drag of axisymmetric blunt-based and boattail models at low speed

  • 期刊论文

  • 发表日期：

    2026年5月11日

查看全文
  • Van Duy Pham,
  • The Hung Tran,
  • Dinh Anh Le,
  • Dinh Quang Nguyen,
  • Masashi Kashitani

摘要

Aerodynamic and flow behaviors of axisymmetric bodies with blunt-based and boattail configurations are investigated under different angles of attack. Particular emphasis is placed on the influence of 20° boattail modifications incorporating longitudinal grooves on wake structure and drag behavior. The angle of attack was adjusted systematically from 0° to 25°, with data acquired through aerodynamic experiments and computational flow analysis. Experimental methods provided lift and drag data, while turbulence modeling in the numerical simulations utilized a two-equation k-ω SST approach within the RANS framework. The results show that longitudinal grooves promote flow reattachment and enhance base-pressure recovery at low angles of attack, yielding up to a 20 % reduction in drag compared with the smooth boattail configuration. However, the drag-reduction benefit progressively diminishes as the angle of attack increases. The modification of the drag is connected to the change of flow fields at the forebody and the near wake behind the base. Leeward side and longitudinal rear-end vortices are found to be typical features of the flow around the models. The interaction among the surface flow, wake region, skin-friction results and aerodynamic drag of the model is discussed. These insights provide guidance for the aerodynamic design of boattail bodies operating under off-design or maneuvering conditions.