基于CFD的风雨环境翼伞动力学建模

摘要

为研究风雨对翼伞飞行性能的影响,引入风雨环境翼伞动力学模型,在气动方程中加入雨膜、风荷载、雨荷载等影响因素.利用CFD技术模拟风雨环境:通过网格速度模拟风场,多相流模拟降雨,动网格模拟翼伞姿态变化,并求解时均Navier-Stokes(RANS)方程,对气动方程进行补充与验证,从而完成风雨环境的翼伞动力学建模工作.研究结果表明:CFD模拟结果与NASA经典风洞试验结果接近,验证了翼伞气动方程的合理性;所建模型能够较好描述翼伞在风雨环境下的飞行性能,为复杂环境下翼伞建模提供了新思路.%In order to explor the influences of wind and rain on parafoil flight characteristics,parafoil dynamic model was introduced in wind and rain environment by adding the effect factors of rain film,wind load and rain load into its aerodynamic equations.Then,the wind and rain environment was simulated by the CFD method:with wind simulated by mesh velocity,rainfall simulated by multiphase flow and parafoil attitude simulated by dynamic mesh,the Reynolds Averaged Navier Stokes (RANS) equations were solved for the supplements and verification of parafoil aerodynamic equations,so as to complete the task of parafoil dynamic modeling in wind and rain environment.The result shows that CFD simulation results is close to classical NASA wind tunnel test results,which verifies the rationality of parafoil aerodynamic equation.Parafoil dynamic model established in this paper describes the flight characteristics of parafoil in wind and rain environment,which provides a new idea for parafoil modeling in complex environment.