科研之友
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摘要
For a more accurate simulation of the flow field around parachute in terminal descent, firstly the microporous fabric permeability performance obtained through experiments is described in modeling description, and the fluid-structure interaction is utilized to obtain the aerodynamic shape of flexible canopy in stable stage. Then the computation domain is divided into microporous fabric permeability domain and flow field domain according to the aerodynamic shape. The momentum governing equation with correction source term which is affected by the fabric permeability is established in permeability domain and the standard k-epsilon turbulence model is utilized to simulate the flow around the parachute in the flow field domain. The drag characteristics obtained by this new method is more consistent with airdrop test results than the past simulation which verifies the feasibility and accuracy of the new method. In addition, the canopy pressure distribution along the meridian is obtained considering fabric permeability. The flow field structure shows that behind the canopy there exist backflow, swirl flow, ventilation flow and other flow states. The method can not only provide the basis for parachute design and material selection, but also provide a reference for other permeable fabric operating characteristic analysis.
- 出版日期2014
- 单位南京航空航天大学; 中国民用航空飞行学院
