环片数量对环帆伞气动性能的影响

为探究环片数量对环帆伞气动性能的影响,文章基于 CFD方法对某环帆伞流场开展了定常三维数值模拟,采用有限体积法求解不可压缩 Navier-Stokes控制方程来模拟外部流场,获得了该伞的气动参数与绕流流场分布。通过数值结果与空投试验结果对比,验证了数值方法的准确性。在不改变伞衣名义面积和环帆高度比的前提下,分别针对定结构透气量和变结构透气量开展了环片数量对气动性能的影响研究,结果表明:定结构透气性下,环片数量对伞衣阻力性能和气动静稳定性的影响很小；变结构透气性下,环片数量通过影响透气量、尾涡分布等因素进一步影响环帆伞稳定性。上述结果对环帆伞的设计有一定参考意义。

The Influence of the Number of Rings on the Aerodynamic Performance of the Ringsail Parachute

In order to explore the influence of the number of rings on the aerodynamic performance of ringsail parachute,this paper carried out a steady three-dimensional numerical simulation of the flow field based on the CFD method, and theincompressible Navier-Stokes equation was solved by the finite volume method, the aerodynamic parameters and flow fielddistribution of the ringsail parachute were dotained. By comparing the numerical results with the airdrop test results, theaccuracy of the numerical method was verified. The influence of the number of rings on the aerodynamic performance ofthe ringsail parachute was studied respectively for the fixed geometric porosity and the variable geometric porosity withoutchanging the nominal area and the ratio of rings to sails. The results show that the change of the number of rings will notcause the great change of the resistance performance and stability performance of the canopy under the fixed geometric po?rosity. The number of rings will affect the stability of the ringsail parachute under the variable grometric porosity by affect?ing the geometric porosity and the distribution of wake vortex. The above conclusions have certain reference significancefor the design of the ringsail parachute.